4927:
2861:
3554:
493:
505:
481:
1078:
231:, and development on the PLL was thus frozen. Camenzind proposed the development of a universal circuit based on the oscillator for PLLs and asked that he develop it alone, borrowing equipment from Signetics instead of having his pay cut in half. Camenzind's idea was originally rejected, since other engineers argued the product could be built from existing parts sold by the company; however, the marketing manager approved the idea.
3426:
3542:
3442:
4798:
limitation of hundreds of kHz across their full temperature range. Section 8.1 of the Texas
Instruments NE555 datasheet states a value of 100 kHz, and their website shows a value of 100 kHz in timer comparison tables. Signetics App Note 170 states that most devices will oscillate up to 1 MHz; however, when considering temperature stability, it should be limited to about 500 kHz. The application note from
1066:
3766:
937:
2274:
3709:
200:
925:
5020:
2849:
85:
4954:
4942:
4902:
4884:
36:
208:
145:
243:). The 9-pin version had already been released by another company founded by an engineer who had attended the first review and had retired from Signetics; that firm withdrew its version soon after the 555 was released. The 555 timer was manufactured by 12 companies in 1972, and it became a best-selling product.
4911:
The dual version is called 556. It features two complete 555 timers in a 14-pin package; only the two power-supply pins are shared between the two timers. In 2020, the bipolar version was available as the NE556, and the CMOS versions were available as the
Intersil ICM7556 and Texas Instruments TLC556
3241:
For each row in the example table (right), additional timing values can easily be created by adding one to three of the same resistor value in parallel and/or series. A second resistor in parallel, the new timing is half the table time. A second resistor in series, the new timing is double the table
4797:
For the "Frequency max." column, a "*" denotes values that may not be the actual maximum frequency limit of the part. The MIC1555 datasheet discusses limitations from 1 to 5 MHz. Though most bipolar timers don't state the maximum frequency in their datasheets, they all have a maximum frequency
255:
Several books report the name "555" timer IC derived from the three 5 kΩ resistors inside the chip. However, in a recorded interview with an online transistor museum curator, Hans
Camenzind said "It was just arbitrarily chosen. It was Art Fury (marketing manager) who thought the circuit was gonna
234:
The first design for the 555 was reviewed in the summer of 1971. After this design was tested and found to be without errors, Camenzind got the idea of using a direct resistance instead of a constant current source, finding that it worked satisfactorily. The design change decreased the required 9
906:
Positive supply: For bipolar timers, the supply voltage range is typically 4.5 to 16 volts (some are spec'ed for up to 18 volts, though most will operate as low as 3 volts). For CMOS timers, the supply voltage range is typically 2 to 15 volts (some are spec'ed for up to 18 volts, and some are
2663:
295:
part number designated the military temperature range, −55 °C to +125 °C. These chips were available in both high-reliability metal can (T package) and inexpensive epoxy plastic (V package) form factors. Thus, the full part numbers were NE555V, NE555T, SE555V, and SE555T.
2157:
246:
The 555 found many applications beyond timers. Camenzind noted in 1997 that "nine out of 10 of its applications were in areas and ways I had never contemplated. For months I was inundated by phone calls from engineers who had new ideas for using the device."
1981:
6716:
6277:
783:
by default). By applying a voltage to this pin, the timing characteristics can be changed. In astable mode, this pin can be used to frequency-modulate the OUTPUT state. If this pin is not used, it should be connected to a 10
2536:
235:
external pins to 8, so the IC could be fit in an 8-pin package instead of a 14-pin package. This revised version passed a second design review, and the prototypes were completed in
October 1971 as the NE555V (plastic
4793:
at 5 V. The value listed in this table was estimated by comparing the 5 V to 15 V ratio of other bipolar datasheets, then derating the 15 V parameter for the NE558 part, which is denoted by the
3079:
of 3 constant. The output pulse duration can be lengthened or shortened as desired by adjusting the values of R and C. Subsequent triggering before the end of this timing interval won't affect the output pulse.
648:, except when CONTROL is driven by an external signal), OUTPUT goes to the high state and a timing interval starts. As long as TRIGGER continues to be kept at a low voltage, OUTPUT will remain in the high state.
524:
of the 8-pin 555 timer and 14-pin 556 dual timer are shown in the following table. Since the 556 is conceptually two 555 timers that share power pins, the pin numbers for each half are split across two columns.
6448:
1758:
2015:
3665:. This centered signal is connected to both the trigger and threshold input pins of the timer. The input signal must be strong enough to excite the trigger levels of the comparators to exceed the lower
6584:
6540:
1828:
284:(DIP-8). Variants available included the 556 (a DIP-14 combining two complete 555s on one chip), and 558 / 559 (both variants were a DIP-16 combining four reduced-functionality timers on one chip).
6401:
2387:
227:(PLL) IC. He designed an oscillator for PLLs such that the frequency did not depend on the power supply voltage or temperature. Signetics subsequently laid off half of its employees due to the
6516:
3735:
In 2006, the dual 556 timer was available in through-hole packages as DIP-14 (2.54 mm pitch), and surface-mount packages as SO-14 (1.27 mm pitch) and SSOP-14 (0.65 mm pitch).
1539: Vcc, the threshold pin causes the 555's internal latch to change state, causing OUT to go low and the internal discharge transistor to go into saturation (maximal-conductivity) mode.
191:
timers. In 2017, it was said that over a billion 555 timers are produced annually by some estimates, and that the design was "probably the most popular integrated circuit ever made".
6145:
2990:
1862:
3897:
Numerous companies have manufactured one or more variants of the 555, 556, 558 timers over the past decades, under many different part numbers. The following is a partial list:
2471:
6128:
5311:
The 555 timer chip, developed in 1970, is probably the most popular integrated circuit ever made. By some estimates, more than a billion of them are manufactured every year.
1644:. Consequently, the first pulse has a longer high time interval compared to later pulses. Moreover, the capacitor charges through both resistors but only discharges through
724:
Reset: a timing interval may be reset by driving this pin to GND, but the timing does not begin again until this pin rises above approximately 0.7 volts. This pin overrides
2756:
2528:
3776:
These specifications apply to the original bipolar NE555. Other 555 timers can have different specifications depending on the grade (industrial, military, medical, etc.).
4802:
mentions that at higher supply voltages the maximum power dissipation of the circuit might limit the operating frequency, as the supply current increases with frequency.
4786:" column, a 5-volt supply was chosen as a common voltage to make it easier to compare. The value for Signetics NE558 is an estimate because NE558 datasheets don't state
6438:
5670:
3523:
No timing capacitors are required in a bistable configuration. The threshold input is grounded because it is unused. The trigger and reset inputs may be held high via
445:
of the timer and is controlled by the two comparators. RESET overrides the other two inputs, thus the latch (and therefore the entire timer) can be reset at any time.
5106:
is a constant, approximately 0.693147 (rounded to 6 significant digits), or commonly rounded to fewer digits in 555 timer books and datasheets to 0.693, 0.69, or 0.7
3073:
2838:
to shunt electrical noise. However if a time-varying voltage source was applied to the control pin, then the pulse widths would be dependent on the control voltage.
2264:
1423:
3647:
3620:
2337:
2306:
1669:
1567:
1524:
1497:
1393:
6742:
5468:
The 555 gets its name from the three 5-kW +VCC R1 discharging path 555 R 2 C 6 resistors shown in the block diagram. These resistors act as a three-step voltage.
3037:
3013:
2914:
2228:
2204:
2180:
2007:
1854:
1443:
6576:
5118:
is a constant, approximately 1.098612 (rounded to 6 significant digits), or commonly rounded to fewer digits in 555 timer books and datasheets to 1.099 or 1.1
6985:
6530:
6494:
5540:
The reference voltage for the comparators is established by a voltage divider consisting of three 5 - k2 resistors, which is where the name 555 is derived
6390:
3738:
In 2012, the 555 was available in through-hole packages as DIP-8 (2.54 mm pitch), and surface-mount packages as SO-8 (1.27 mm pitch), SSOP-8 /
842:
by default except when CONTROL is driven by an external signal), then the OUTPUT high state timing interval ends, causing OUTPUT to go to the low state.
6872:
6470:
5694:
1019:
timers, missing pulse detection, bounce-free switches, touch switches, frequency dividers, triggered measurement of resistance or capacitance, PWM, etc.
2658:{\displaystyle t_{\text{high}}=\ln \left({\frac {2\,V_{\text{CC}}-3\,V_{\text{diode}}}{V_{\text{CC}}-3\,V_{\text{diode}}}}\right)\cdot R_{1}\cdot C,}
6508:
6172:
5071:
5062:
6817:
6562:
57:
44:
6648:
6011:
5951:
5461:
5304:
5048:
1112:
6792:
2852:
Schematic of a 555 in monostable mode. Example values C = 100 nF, R = 180 kΩ to 220 kΩ for debouncing a pulled-up pushbutton.
6100:
1469:, the trigger pin causes the 555's internal latch to change state, causing OUT to go high and the internal discharge transistor to cut-off.
421:'s negative input is connected to voltage divider's upper reference voltage, and the comparator's positive input is connected to THRESHOLD.
6035:
878:
when OUTPUT is low. In bistable latch and bistable inverter modes, this pin is unused, which allows it to be used as an alternate output.
1472:
Since the discharge pin is no longer short-circuited to ground, the capacitor starts charging via current from Vcc through the resistors
492:
7158:
2152:{\displaystyle D~(\%)={\frac {t_{\text{high}}}{t_{\text{high}}+t_{\text{low}}}}\cdot 100={\frac {R_{1}+R_{2}}{R_{1}+2\,R_{2}}}\cdot 100}
6892:
6855:
6837:
6812:
6771:
6757:
6736:
6701:
6680:
5924:
5891:
5053:
1680:
6948:
504:
6607:
5525:
5489:
4128:
Reduced pins & features (only astable & monostable & no reset for MIC1555, astable only for MIC1557), only available in
6926:
6199:
5941:
6944:
6117:
6001:
6978:
3739:
431:'s positive input is connected to voltage divider's lower reference, and the comparator's negative input is connected to TRIGGER.
299:
Low-power CMOS versions of the 555 are now available, such as the
Intersil ICM7555 and Texas Instruments LMC555, TLC555, TLC551.
6227:
7153:
7015:
5067:
5058:
4799:
6622:
Not all functions are brought out to the 558's pins. This chip is designed primarily for monostable multivibrator applications
2422:
and C, with an adjustment based on the voltage drop across the diode. The low time is unaffected by the diode and so remains
1769:
5657:
5610:
5589:
5429:
4926:
3090:
2342:
1095:
6373:
6340:
6052:
5806:
5773:
5740:
1365:
In the astable configuration, the 555 timer puts out a continuous stream of rectangular pulses having a specific period.
6294:
5983:
5851:
5169:
3350:
3267:
357:. CONTROL is connected between the upper two resistors, allowing an external voltage to control the reference voltages:
2831:
In the previous example schematics, the control pin was not used, thus it should connected to ground through a 10
315:
of the 555 timer are highlighted with the same color across all three drawings to clarify how the chip is implemented:
7148:
6971:
6897:
984:
874:(O.C.) output for bipolar timers, or an open-drain (O.D.) output for CMOS timers. This pin can be used to discharge a
184:
4805:
For the "Manufacturer" column, the following associates historical 555 timer manufacturers to current company names.
480:
4963:
The quad version is called 558 and has four reduced-functionality timers in a 16-pin package designed primarily for
3545:
Schematic of a 555 timer in bistable
Schmitt trigger inverter mode. Example values C = 100 nF, R1 & R2 = 100 kΩ.
6419:
2697:
4773:
All information in the above table was pulled from references in the datasheet column, except where denoted below.
171:
applications. It is one of the most popular timing ICs due to its flexibility and price. Derivatives provide two (
7070:
978:
6244:
1002:. A microprocessor can then convert the pulse period to temperature, linearize it, and even provide calibration.
228:
6484:
4964:
4887:
4129:
3754:
442:
6462:
1976:{\displaystyle f={\frac {1}{t_{\text{high}}+t_{\text{low}}}}={\frac {1}{\ln(2)\cdot (R_{1}+2\,R_{2})\cdot C}}}
5707:
3181:
The timing table (right) shows common electronic component value solutions for various powers of 10 timings.
2942:
7096:
4808:
104:
49:
6953:
1671:, thus the output high interval is longer than the low interval. This is shown in the following equations:
936:
5103:
4839:
4089:
2267:
974:
924:
6958:
6164:
5273:
5043:
4133:
3878:
3770:
3573:
2860:
1088:
1046:
960:
168:
5219:
5076:
5004:
3577:
3475:
1445:. The threshold and trigger pins are both connected to the capacitor; thus they have the same voltage.
452:
7075:
7002:
6554:
6095:
4863:
4833:
4735:
4284:
4099:
3725:
3713:
2835:
2425:
966:
912:
788:
576:
331:
281:
236:
93:
3553:
6489:
6194:
6060:
4867:
4826:
4179:
4058:
4019:
3592:
2407:
987:(ADC) from an analog value represented by a resistance or capacitance into a digital pulse length.
791:(between this pin and GND) to ensure electrical noise doesn't affect the internal voltage divider.
6932:
2714:
2486:
2277:
Schematic of a 555 timer in astable mode with a 1N4148 diode to create a duty cycles less than 50%
6994:
6272:
5374:
5025:
4891:
4857:
4380:
1542:
This discharge transistor provides a discharge path, so the capacitor starts discharging through
995:
160:
108:
6087:
6027:
5354:
3697:
thresholds in order to cause them to change state, thus providing the schmitt trigger feature.
6888:
6833:
6808:
6767:
6753:
6732:
6697:
6676:
6644:
6638:
6613:
6603:
6535:
6485:"Renesas and Intersil Announce Final Regulatory Approval for Renesas' Acquisition of Intersil"
6368:
6335:
6302:
6007:
5978:
5947:
5920:
5887:
5846:
5801:
5768:
5735:
5531:
5521:
5495:
5485:
5457:
5335:
5300:
5294:
5164:
5115:
5084:
5038:
4843:
4417:
3940:
3076:
470:
354:
224:
136:
6785:
5565:
5410:
5366:
4812:
4143:
3949:
3585:
3524:
3483:
3046:
2237:
1398:
677:
3625:
3598:
2315:
2284:
1647:
1545:
1502:
1475:
1371:
199:
187:. Since then, numerous companies have made the original timers and later similar low-power
7106:
7065:
6938:
4514:
3743:
3570:
3467:
3458:
1042:
1028:
1013:
970:
764:
438:
335:
264:
Depending on the manufacturer, the standard 555 package incorporated the equivalent of 25
3595:
through a low value series capacitor, then biased by identical high-resistance resistors
6685:
6186:
5553:
1077:
728:, which in turn overrides THRESHOLD. If this pin is not used, it should be connected to
7060:
6804:
5080:
5000:
4776:
For the "Total timers" column, a "*" denotes parts that are missing 555 timer features.
4049:
3581:
3479:
3425:
3022:
2998:
2899:
2213:
2189:
2165:
1992:
1839:
1428:
871:
323:
216:
118:
3541:
3520:
momentarily low acts as a "reset" and transitions the Out pin to the low state (GND).
3441:
7142:
7080:
6884:
6443:
6264:
6216:
5912:
5243:
3564:
3184:
Scaling R and C by opposite powers of 10 will provide the same timing. For instance:
1024:
1009:
956:
308:
5378:
3765:
6829:
6711:
5326:
Carmenzind, Hans (2010). "タイマIC 555 誕生秘話" [The birth of the 555 timer IC].
4990:
Four "Triggers" are falling-edge sensitive (558), instead of level sensitive (555).
2474:
1065:
3708:
2390:
5451:
2483:
slows charging on the capacitor, so the high time is longer than the often-cited
7045:
6439:"ON Semiconductor Successfully Completes Acquisition of Fairchild Semiconductor"
2273:
1107:
999:
5569:
5370:
5019:
360:
When CONTROL is not driven, this divider creates an upper reference voltage of
84:
7050:
6360:
6327:
6065:
5793:
5760:
5727:
5033:
5015:
4987:
Four "Control
Voltage" are tied together internally to one external pin (558).
3509:
momentarily low acts as a "set" and transitions the output to the high state (
3464:
3445:
2893:
2876:
Monostable mode produces an output pulse when the trigger signals drops below
2871:
2418:
during the high part of the cycle, so that the high interval depends only on R
2403:
1987:
1126:
1034:
991:
466:
428:
418:
265:
6307:
5970:
5838:
5339:
5156:
4993:
Two resistors in the voltage divider (558), instead of three resistors (555).
7101:
7020:
6867:
6850:
6728:
6617:
6249:
5879:
5665:
5535:
5499:
5278:
5224:
4931:
4849:
4248:
3721:
2848:
1834:
1102:
875:
312:
220:
180:
89:
4967:
applications. By 2014, many versions of 16-pin NE558 have become obsolete.
4846:
in 2011. The LM555 and LM556 started as a
National Semiconductor products.
3732:-8 metal can packages, and the 556 timer was released in a DIP-14 package.
291:
parts were commercial temperature range, 0 °C to +70 °C, and the
179:) timing circuits in one package. The design was first marketed in 1972 by
35:
4953:
4941:
4901:
4883:
4819:
Semiconductor
Components Group. The MC1455 started as a Motorola product.
680:(P.P.) output that is driven to either a low state (GND) or a high state (
7127:
6466:
5702:
4822:
4816:
3448:
3430:
1448:
Its repeated operating cycle (starting with the capacitor uncharged) is:
915:(s) are generally applied (between this pin and GND) as a good practice.
339:
273:
207:
144:
7122:
7040:
4853:
4756:
3884:
277:
907:
spec'ed as low as 1 volt). See the supply min and max columns in the
17:
7035:
7030:
6963:
5414:
4009:
3977:
3827:
3097:
2917:
2183:
521:
391:
When CONTROL is driven, the upper reference voltage will instead be V
4984:
Four "Reset" are tied together internally to one external pin (558).
4957:
558 internal block diagram. It is different from 555 and 556 timers.
3251:
3193:
6643:. Encyclopedia of Electronic Components. Vol. 2. Maker Media.
6531:"Texas Instruments completes acquisition of National Semiconductor"
5652:
5650:
5611:"Oral History Hans Camenzind Historic 555 Integrated Circuit Page6"
7055:
5648:
5646:
5644:
5642:
5640:
5638:
5636:
5634:
5632:
5630:
4952:
4940:
4925:
4900:
4882:
3764:
3707:
3540:
3424:
3102:
3040:
2859:
2847:
2832:
2272:
2231:
1076:
1064:
785:
269:
206:
198:
164:
5689:
5687:
5685:
5683:
5268:
5266:
5264:
5214:
5212:
5210:
5208:
5206:
5204:
5202:
2402:
To create an output high time shorter than the low time (i.e., a
7025:
5200:
5198:
5196:
5194:
5192:
5190:
5188:
5186:
5184:
5182:
4288:
3988:
3929:
3861:
3809:
3750:
3729:
3528:
1753:{\displaystyle t_{\text{high}}=\ln(2)\cdot (R_{1}+R_{2})\cdot C}
240:
188:
6967:
6640:
6600:
Amplifiers, waveform generators, and other low-cost IC projects
4829:
in 2017. The ICM7555 and ICM7556 started as Intersil products.
4815:
in 2016. ON Semiconductor was founded in 1999 as a spinoff of
3700:
No timing capacitors are required in a bistable configuration.
1593:
During the first pulse, the capacitor charges from 0 V to
6082:
6080:
6078:
5401:
Camenzind, H.R. (September 1997). "Redesigning the old 555 ".
3963:
3107:
3016:
2207:
1368:
The astable configuration is implemented using two resistors,
451:: The output of the latch is followed by an output stage with
346:
29:
6807:(inventor of 555 timer); Virtual Bookworm; 244 pages; 2005;
6675:; 2nd Ed; Howard Berlin; BPB Publications; 218 pages; 2008;
353:
kΩ or higher for CMOS) to create reference voltages for the
735:
to prevent electrical noise accidentally causing a reset.
6766:; E.A. Parr; Bernard Babani Publishing; 144 pages; 1978;
5874:
5872:
5870:
5868:
5866:
5864:
2414:, with the cathode on the capacitor side. This bypasses R
1674:
The output high time interval of each pulse is given by:
1763:
The output low time interval of each pulse is given by:
1045:(inverter) mode – the 555 operates as a Schmitt trigger
819:
Threshold: when the voltage at this pin is greater than
6826:
Timer, Op Amp, and Optoelectronic Circuits and Projects
6047:
6045:
4996:
One comparator (558), instead of two comparators (555).
4970:
Partial list of differences between 558 and 555 chips:
2788:
C, which is 45% longer than the "expected" 0.693 R
1823:{\displaystyle t_{\text{low}}=\ln(2)\cdot R_{2}\cdot C}
977:(PWM), logic clocks, tone generation, security alarms,
6355:
6353:
6322:
6320:
5788:
5786:
5755:
5753:
5722:
5720:
2717:
2489:
2428:
998:
with the period of the output pulse determined by the
6927:
Using the 555 Timer IC in Special or Unusual Circuits
6790:; Tony Kuphaldt; Open Book Project; 423 pages; 2010.
6708:
Engineer's Mini-Notebook – 555 Timer IC Circuits
5965:
5963:
5833:
5831:
5829:
5827:
5825:
5823:
5821:
5819:
5430:"The 555 Timer IC – An Interview with Hans Camenzind"
3628:
3601:
3049:
3025:
3001:
2945:
2902:
2539:
2345:
2318:
2287:
2240:
2216:
2192:
2168:
2018:
1995:
1865:
1842:
1772:
1683:
1650:
1548:
1505:
1478:
1431:
1401:
1374:
687:
minus approximately 1.7 volts for bipolar timers, or
5907:
5905:
5903:
5504:
The 555 got its name from the three 5-kOhm resistors
5151:
5149:
5147:
5145:
5143:
5141:
5139:
5137:
5135:
4759:
to +230 °C), ceramic DIP-8 package or bare die.
2382:{\displaystyle {\frac {{V_{\text{CC}}}^{2}}{R_{1}}}}
7115:
7089:
7001:
6714:III; Radio Shack; 33 pages; 1989; ASIN B000MN54A6.
6509:"Microchip Technology Completes Micrel Acquisition"
6463:"Former Motorola group emerges as ON Semiconductor"
5590:"Oral History Hans Camenzind Historic 555 IC Page2"
3591:For the schematic on the right, an input signal is
2700:
and can be found in datasheets or measured). When V
1052:
Converts a noisy input into a clean digital output.
1012:(one-shot) mode – The 555 operates as a "one-shot"
223:. In 1968, he was hired by Signetics to develop a
135:
125:
114:
100:
6673:555 Timer Applications Sourcebook With Experiments
5237:
5235:
4870:in 2008. The ZSCT1555 started as a Zetex product.
4836:in 2015. The MIC1555 started as a Micrel product.
3753:555-type timer with three fewer pins available in
3641:
3614:
3067:
3031:
3007:
2984:
2908:
2750:
2657:
2522:
2465:
2381:
2331:
2300:
2258:
2222:
2198:
2174:
2151:
2001:
1975:
1848:
1822:
1752:
1663:
1561:
1518:
1491:
1437:
1417:
1387:
994:as timing resistor allows the use of the 555 in a
763:Control: this pin provides access to the internal
6696:; 1st Ed; R.M. Marston; Newnes; 276 pages; 1990;
6577:"Diodes Incorporated closes acquisition of Zetex"
1610:, however, in later pulses, it only charges from
6916:table and "References" section in this article.
6637:Platt, Charles; Jansson, Fredrik (2014-11-13).
5482:Digital electronics : a practical approach
3757:-5 (0.95 mm pitch) surface-mount package.
2807:C, which is closer to the expected 0.693 R
256:sell big who picked the name '555' timer IC.."
3372:kΩ resistors in series" in series with "two 91
952:The 555 IC has the following operating modes:
27:Integrated circuit used for timer applications
6979:
6857:(Appnotes AN170/171 and Datasheets NE555/6/8)
6427:(in German). Halbleiterwerk Frankfurt (Oder).
5943:Linear IC Applications: A Designer's Handbook
5396:
5394:
5392:
5390:
5388:
2896:sets the output pulse's duration as the time
959:(free-running) mode – The 555 operates as an
459:mA for bipolar timers, lower for CMOS timers.
8:
5484:(2nd ed.). Prentice Hall. p. 401.
3649:, which causes the signal to be centered at
1452:Since the capacitor's voltage will be below
77:
2803:= 0.3 V, the high time is 0.725 R
465:: Also, the output of the latch controls a
6986:
6972:
6964:
5456:(4th ed.). McGraw Hill. p. 687.
5334:(12). Translated by 三宅, 和司. CQ出版: 73, 74.
5244:"Hans Camenzind, 555 timer inventor, dies"
4930:Die of a NE558 quad timer manufactured by
3899:
3531:and only enabled by connecting to ground.
3474:output) with two outputs: output pin is a
3087:
1092:
6832:III; Master Publishing; 128 pages; 2004;
6752:; Jules Gilder; Hayden; 115 pages; 1979;
5220:"Linear LSI Data and Applications Manual"
3633:
3627:
3606:
3600:
3048:
3024:
3000:
2944:
2901:
2827:Voltage-controlled pulse-width modulation
2744:
2738:
2733:
2716:
2711:, this charging is faster and approaches
2640:
2620:
2615:
2603:
2591:
2586:
2574:
2569:
2563:
2544:
2538:
2516:
2510:
2505:
2488:
2459:
2455:
2449:
2444:
2427:
2371:
2361:
2354:
2349:
2346:
2344:
2323:
2317:
2292:
2286:
2239:
2215:
2191:
2167:
2134:
2129:
2117:
2105:
2092:
2085:
2067:
2054:
2043:
2037:
2017:
1994:
1955:
1950:
1938:
1907:
1895:
1882:
1872:
1864:
1841:
1808:
1777:
1771:
1735:
1722:
1688:
1682:
1655:
1649:
1572:Once the capacitor's voltage drops below
1553:
1547:
1510:
1504:
1483:
1477:
1430:
1406:
1400:
1379:
1373:
498:555 internal schematic of bipolar version
3778:
3552:
3440:
1069:Schematic of a 555 timer in astable mode
527:
455:output drivers that can supply up to 200
395:and the lower reference voltage will be
203:Silicon die of the first 555 chip (1971)
60:of all important aspects of the article.
6847:Linear LSI Data and Applications Manual
5321:
5319:
5131:
5096:
5072:List of 7400-series integrated circuits
5063:List of 4000-series integrated circuits
3971:
3968:
2985:{\displaystyle t=\ln(3)\cdot R\cdot C,}
2811:C. The equation approaches 0.693 R
920:
476:
6954:Teardown of a bipolar RCA LM555CH chip
6939:Common Mistakes When Using a 555 Timer
6451:from the original on January 28, 2020.
4890:of a NE556 dual timer manufactured by
3868:Power consumption (minimum operating)
3535:Bistable schmitt trigger inverter gate
2784:= 0.7 V, high time is 1.00 R
510:555 internal schematic of CMOS version
76:
56:Please consider expanding the lead to
6632:
6630:
6559:Silicon Valley Historical Association
5049:List of LM-series integrated circuits
3724:originally released the 555 timer in
1027:(latch) mode – The 555 operates as a
215:The timer IC was designed in 1971 by
7:
6887:; Sams Publishing; 412 pages; 1974;
6731:; Sams Publishing; 384 pages; 1983;
6565:from the original on March 21, 2020.
6106:from the original on April 21, 2021.
6038:from the original on March 15, 2023.
5355:"25 Microchips That Shook the World"
3569:A 555 timer can be used to create a
2675:is when the diode's "on" current is
6602:. New York: TAB Books. p. 27.
6497:from the original on June 13, 2020.
6407:from the original on July 10, 2023.
6379:from the original on June 29, 2017.
6346:from the original on June 29, 2017.
6205:from the original on June 29, 2017.
6134:from the original on June 29, 2017.
5989:from the original on June 29, 2017.
5857:from the original on June 29, 2017.
5812:from the original on June 29, 2017.
5779:from the original on June 28, 2017.
5746:from the original on June 28, 2017.
5453:Practical Electronics for Inventors
5175:from the original on June 28, 2017.
3742:-8 / VSSOP-8 (0.65 mm pitch),
176:
172:
6587:from the original on May 22, 2020.
6543:from the original on May 22, 2020.
6519:from the original on May 22, 2020.
6473:from the original on June 8, 2020.
6283:from the original on May 26, 2020.
6233:from the original on May 22, 2020.
6175:from the original on May 27, 2020.
5676:from the original on May 11, 2021.
5552:GoldStein, Harry (March 3, 2003).
5450:Scherz, Paul; Monk, Simon (2016).
5296:Electronics All-in-One For Dummies
5054:List of linear integrated circuits
3576:with two outputs: output pin is a
3489:For the schematic on the right, a
3326:kΩ resistor in series with "two 91
2410:) can be placed in parallel with R
2406:less than 50%) a fast diode (i.e.
2028:
1529:Once the capacitor charge reaches
473:that connects DISCHARGE to ground.
25:
6959:Teardown of a CMOS TI LMC555 chip
4981:and one GND, similar to 556 chip.
374:and a lower reference voltage of
6913:
5328:トランジスタ技術 (Transistor Technology)
5242:Fuller, Brian (15 August 2012).
5018:
4913:
2466:{\textstyle \ln(2)\,R_{2}\,C\,.}
1589:, the cycle repeats from step 1.
935:
923:
908:
579:reference voltage (zero volts).
503:
491:
479:
143:
83:
34:
7016:Communications Processor Module
6694:Timer/Generator Circuits Manual
6064:. November 2012. Archived from
6006:. Elektor International Media.
5886:(1 ed.). Sams Publishing.
5068:7400-series integrated circuits
5059:4000-series integrated circuits
3557:Schmitt trigger inverter symbol
3429:Schematic of a 555 in bistable
575:Ground supply: this pin is the
167:, delay, pulse generation, and
48:may be too short to adequately
6306:. October 2015. Archived from
6163:Senft, James (February 2016).
6028:"555 Timer as Schmitt Trigger"
5520:. Prentice Hall. p. 357.
5003:(O.C.) type (558), instead of
3978:Custom Silicon Solutions (CSS)
3089:Monostable mode examples with
3062:
3056:
2964:
2958:
2792:C. At the other extreme, when
2730:
2724:
2502:
2496:
2441:
2435:
2253:
2247:
2031:
2025:
1961:
1931:
1925:
1919:
1798:
1792:
1741:
1715:
1709:
1703:
338:consisting of three identical
211:Die of a CMOS NXP ICM7555 chip
58:provide an accessible overview
1:
6418:Reick, Ullrich (1986-03-01).
5554:"The Irresistible Transistor"
3493:input signal connects to the
2751:{\textstyle \ln(2)\,R_{1}\,C}
2523:{\textstyle \ln(2)\,R_{1}\,C}
6786:Lessons in Electric Circuits
6555:"NXP Semiconductors history"
6245:"Analog Applications Manual"
3580:output, discharge pin is an
3478:output, discharge pin is an
3470:(though without an inverted
2773:As an extreme example, when
2698:depends on the type of diode
2312:The maximum power rating of
985:Analog-to-digital conversion
280:chip packaged into an 8-pin
185:bipolar junction transistors
6929:- Nuts & Volts magazine
5940:Carr, Joseph (1996-12-19).
5706:. June 2016. Archived from
5081:Open-collector/drain output
3712:Texas Instruments NE555 in
3451:symbol, but lacks /Q output
3376:kΩ resistors in parallel"),
3330:kΩ resistors in parallel"),
2864:Waveform in monostable mode
1094:Astable mode examples with
7175:
7159:Linear integrated circuits
6899:(Chapter 4, pages 171-188)
6864:Analog Applications Manual
6421:Zeitgeber-IS B 555 / B 556
5592:. The Semiconductor Museum
5570:10.1109/MSPEC.2003.1184435
5516:Simpson, Colin D. (1996).
5432:. The Semiconductor Museum
5371:10.1109/MSPEC.2009.4907384
3857:Maximum Power dissipation
3562:
3463:A 555 timer can act as an
3456:
3289:kΩ resistors in parallel),
2869:
2758:but is slower the closer V
1856:of the pulse is given by:
1086:
930:Pinout of 555 single timer
870:Discharge: This pin is an
486:555 internal block diagram
6788:- Volume VI - Experiments
6779:Books with timer chapters
6169:Nuts & Volts Magazine
5658:"555/556 Timers Databook"
5353:Santo, Brian (May 2009).
5293:Lowe, Doug (2017-02-06).
3849:Output current (maximum)
979:pulse-position modulation
885:
559:
142:
82:
6943:555 timing calculators:
6125:Custom Silicon Solutions
5480:Kleitz, William (1990).
4965:monostable multivibrator
4945:Pinout of 558 quad timer
4905:Pinout of 556 dual timer
3873:225 mW @ 15 V
3414:kΩ resistors in series).
3395:kΩ resistors in series),
2920:it takes to charge C to
2473:But the diode's forward
1081:Waveform in astable mode
1031:. Applications include:
1016:. Applications include:
963:. Applications include:
942:Pinout of 556 dual timer
7097:Freescale Semiconductor
6165:"The Remarkable CSS555"
5946:. Newnes. p. 119.
5695:"ICM7555-556 Datasheet"
4809:Fairchild Semiconductor
3769:555 timer circuit in a
3516:). Conversely, pulling
349:for bipolar timers, 100
322:: Between the positive
7154:Electronic oscillators
6801:Designing Analog Chips
6539:. September 23, 2011.
6447:. September 19, 2016.
5518:Industrial electronics
5299:. Wiley. p. 339.
5274:"Linear Vol1 Databook"
4958:
4946:
4934:
4906:
4894:
4840:National Semiconductor
3871:30 mW @ 5 V,
3773:
3717:
3643:
3616:
3558:
3546:
3452:
3434:
3305:kΩ (values from table)
3220:kΩ (values from table)
3069:
3068:{\displaystyle \ln(3)}
3039:is the capacitance in
3033:
3009:
2986:
2910:
2865:
2853:
2824:
2752:
2659:
2524:
2467:
2383:
2333:
2302:
2278:
2260:
2259:{\displaystyle \ln(2)}
2230:is the capacitance in
2224:
2200:
2176:
2153:
2003:
1977:
1850:
1824:
1754:
1665:
1563:
1520:
1493:
1439:
1419:
1418:{\displaystyle R_{2},}
1389:
1082:
1070:
975:pulse-width modulation
676:Output: this pin is a
212:
204:
149:Internal block diagram
127:First production
6750:110 IC Timer Projects
6598:Horn, Delton (1994).
6493:. February 22, 2017.
6000:Buiting, Jan (2003).
5044:Operational amplifier
4956:
4944:
4929:
4904:
4886:
4854:Philips Semiconductor
4012:, requires programmer
3879:Operating temperature
3771:solderless breadboard
3768:
3746:(0.5 mm pitch).
3711:
3644:
3642:{\displaystyle R_{2}}
3617:
3615:{\displaystyle R_{1}}
3556:
3544:
3527:if they are normally
3497:pin and connecting a
3444:
3428:
3070:
3034:
3015:is the resistance in
3010:
2987:
2911:
2863:
2851:
2771:
2753:
2704:is small relative to
2660:
2525:
2468:
2384:
2339:must be greater than
2334:
2332:{\displaystyle R_{1}}
2303:
2301:{\displaystyle R_{1}}
2276:
2261:
2225:
2206:is the resistance in
2201:
2177:
2154:
2004:
1978:
1851:
1825:
1755:
1666:
1664:{\displaystyle R_{2}}
1564:
1562:{\displaystyle R_{2}}
1521:
1519:{\displaystyle R_{2}}
1494:
1492:{\displaystyle R_{1}}
1440:
1420:
1390:
1388:{\displaystyle R_{1}}
1089:Electronic oscillator
1080:
1068:
961:electronic oscillator
210:
202:
163:used in a variety of
6853:; 1250 pages; 1985.
6187:"ZSCT1555 Datasheet"
6146:"CSS555 Part Search"
6096:Microchip Technology
5615:Semiconductor Museum
4864:Zetex Semiconductors
4834:Microchip Technology
3716:-8 and SO-8 packages
3626:
3599:
3501:input signal to the
3047:
3023:
2999:
2943:
2900:
2836:decoupling capacitor
2822:approaches 0 V.
2715:
2537:
2487:
2426:
2343:
2316:
2285:
2238:
2214:
2190:
2166:
2016:
1993:
1863:
1840:
1770:
1681:
1648:
1546:
1503:
1476:
1429:
1399:
1372:
967:Light emitting diode
913:Decoupling capacitor
789:decoupling capacitor
415:Threshold comparator
282:dual in-line package
239:) and SE555T (metal
6870:; 418 pages; 1979.
6515:. August 12, 2015.
6490:Renesas Electronics
6398:X-REL Semiconductor
6195:Diodes Incorporated
6088:"MIC1555 Datasheet"
6061:Japan Radio Company
5428:Ward, Jack (2004).
4868:Diodes Incorporated
4832:Micrel was sold to
4827:Renesas Electronics
4755:Extreme (−60 °
4059:Japan Radio Company
3584:output (requires a
3505:pin. Thus, pulling
3482:output (requires a
3093:
2408:1N4148 signal diode
1098:
969:and lamp flashers,
79:
7149:1972 introductions
6995:NXP Semiconductors
6933:555 Timer Tutorial
6469:. August 5, 1999.
6391:"XTR655 Datasheet"
6372:. September 1997.
6361:"TLC556 Datasheet"
6328:"TLC552 Datasheet"
6273:STMicroelectronics
6217:"MC1455 Datasheet"
6150:Jameco Electronics
6118:"CSS555 Datasheet"
6053:"NJM555 Datasheet"
5805:. September 1997.
5794:"TLC551 Datasheet"
5761:"TLC555 Datasheet"
5728:"LMC555 Datasheet"
5168:. September 2014.
5085:Three-state output
5026:Electronics portal
5007:(P.P.) type (555).
4999:Four "Output" are
4959:
4947:
4935:
4907:
4895:
4892:STMicroelectronics
4858:NXP Semiconductors
4856:in 1975, later to
4513:Also available in
4381:STMicroelectronics
4088:Also available in
3774:
3718:
3639:
3612:
3559:
3547:
3453:
3435:
3088:
3065:
3029:
3005:
2982:
2906:
2866:
2854:
2799:= 15 V, and V
2748:
2655:
2520:
2463:
2398:Shorter duty cycle
2379:
2329:
2298:
2279:
2256:
2220:
2196:
2172:
2149:
1999:
1973:
1846:
1820:
1750:
1661:
1559:
1516:
1489:
1435:
1425:and one capacitor
1415:
1385:
1093:
1083:
1071:
996:temperature sensor
990:e.g., selecting a
694:for CMOS timers).
425:Trigger comparator
355:analog comparators
303:Internal schematic
219:under contract to
213:
205:
161:integrated circuit
109:integrated circuit
7136:
7135:
6902:
6877:
6860:
6843:
6822:
6797:
6794:(Chapter 6 and 8)
6746:
6725:IC Timer Cookbook
6721:
6690:
6650:978-1-4493-3414-7
6583:. June 13, 2008.
6536:Texas Instruments
6513:Power Electronics
6369:Texas Instruments
6336:Texas Instruments
6313:on June 29, 2017.
6303:Texas Instruments
6295:"LM556 Datasheet"
6265:"TS555 Datasheet"
6226:. December 2009.
6071:on June 29, 2017.
6034:. June 19, 2015.
6013:978-0-905705-66-8
5979:Texas Instruments
5971:"LM555 Datasheet"
5953:978-0-7506-3370-3
5884:IC Timer Cookbook
5847:Texas Instruments
5839:"NE556 Datasheet"
5802:Texas Instruments
5769:Texas Instruments
5736:Texas Instruments
5713:on June 29, 2017.
5463:978-1-259-58755-9
5306:978-1-119-32079-1
5165:Texas Instruments
5157:"NE555 Datasheet"
5039:Counter (digital)
4916:in this article.
4914:derivatives table
4844:Texas Instruments
4765:
4764:
4692:Texas Instruments
4658:Texas Instruments
4625:Texas Instruments
4592:Texas Instruments
4558:Texas Instruments
4524:Texas Instruments
4486:Texas Instruments
4453:Texas Instruments
4418:Texas Instruments
4373:, DIP-16 package.
4332:, DIP-14 package.
3890:
3889:
3749:The MIC1555 is a
3525:pull-up resistors
3419:Bistable SR latch
3179:
3178:
3032:{\displaystyle C}
3008:{\displaystyle R}
2909:{\displaystyle t}
2780:= 5 V, and V
2627:
2623:
2606:
2594:
2577:
2547:
2377:
2357:
2223:{\displaystyle C}
2199:{\displaystyle R}
2175:{\displaystyle t}
2141:
2074:
2070:
2057:
2046:
2024:
2002:{\displaystyle D}
1971:
1902:
1898:
1885:
1849:{\displaystyle f}
1780:
1691:
1438:{\displaystyle C}
1363:
1362:
1035:switch debouncing
919:
918:
911:in this article.
909:derivatives table
471:electronic switch
225:phase-locked loop
153:
152:
137:Electronic symbol
75:
74:
16:(Redirected from
7166:
6988:
6981:
6974:
6965:
6896:
6871:
6854:
6841:
6816:
6791:
6743:(1st Ed in 1977)
6740:
6718:(1st Ed in 1984)
6715:
6687:(1st Ed in 1978)
6684:
6655:
6654:
6634:
6625:
6624:
6595:
6589:
6588:
6573:
6567:
6566:
6551:
6545:
6544:
6527:
6521:
6520:
6505:
6499:
6498:
6481:
6475:
6474:
6459:
6453:
6452:
6435:
6429:
6428:
6426:
6415:
6409:
6408:
6406:
6395:
6387:
6381:
6380:
6378:
6365:
6357:
6348:
6347:
6345:
6332:
6324:
6315:
6314:
6312:
6299:
6291:
6285:
6284:
6282:
6269:
6261:
6255:
6254:
6241:
6235:
6234:
6232:
6224:ON Semiconductor
6221:
6213:
6207:
6206:
6204:
6191:
6183:
6177:
6176:
6160:
6154:
6153:
6142:
6136:
6135:
6133:
6122:
6114:
6108:
6107:
6105:
6092:
6084:
6073:
6072:
6070:
6057:
6049:
6040:
6039:
6024:
6018:
6017:
5997:
5991:
5990:
5988:
5982:. January 2015.
5975:
5967:
5958:
5957:
5937:
5931:
5930:
5909:
5898:
5897:
5876:
5859:
5858:
5856:
5843:
5835:
5814:
5813:
5811:
5798:
5790:
5781:
5780:
5778:
5765:
5757:
5748:
5747:
5745:
5732:
5724:
5715:
5714:
5712:
5699:
5691:
5678:
5677:
5675:
5662:
5654:
5625:
5624:
5622:
5621:
5607:
5601:
5600:
5598:
5597:
5586:
5580:
5579:
5577:
5576:
5549:
5543:
5542:
5513:
5507:
5506:
5477:
5471:
5470:
5447:
5441:
5440:
5438:
5437:
5425:
5419:
5418:
5415:10.1109/6.619384
5398:
5383:
5382:
5350:
5344:
5343:
5323:
5314:
5313:
5290:
5284:
5283:
5270:
5259:
5258:
5256:
5254:
5239:
5230:
5229:
5216:
5177:
5176:
5174:
5161:
5153:
5119:
5113:
5107:
5101:
5077:Push–pull output
5028:
5023:
5022:
4912:and TLC552. See
4813:ON Semiconductor
3900:
3834:Supply current (
3816:Supply current (
3798:Supply voltage (
3779:
3690:
3689:
3685:
3674:
3673:
3669:
3658:
3657:
3653:
3648:
3646:
3645:
3640:
3638:
3637:
3621:
3619:
3618:
3613:
3611:
3610:
3586:pull-up resistor
3519:
3508:
3504:
3500:
3496:
3492:
3484:pull-up resistor
3473:
3413:
3409:
3405:
3401:
3394:
3390:
3386:
3382:
3375:
3371:
3367:
3363:
3359:
3349:kΩ resistors in
3348:
3344:
3340:
3336:
3329:
3325:
3321:
3317:
3313:
3304:
3300:
3296:
3288:
3284:
3280:
3277:ms (0.5x) ≅ 100
3276:
3266:kΩ resistors in
3265:
3261:
3257:
3249:
3236:
3232:
3228:
3219:
3215:
3211:
3203:
3199:
3191:
3147:100 ms (−0.026%)
3114:100 μs (−0.026%)
3094:
3074:
3072:
3071:
3066:
3038:
3036:
3035:
3030:
3014:
3012:
3011:
3006:
2991:
2989:
2988:
2983:
2929:
2928:
2924:
2915:
2913:
2912:
2907:
2885:
2884:
2880:
2757:
2755:
2754:
2749:
2743:
2742:
2684:
2683:
2679:
2664:
2662:
2661:
2656:
2645:
2644:
2632:
2628:
2626:
2625:
2624:
2621:
2608:
2607:
2604:
2597:
2596:
2595:
2592:
2579:
2578:
2575:
2564:
2549:
2548:
2545:
2529:
2527:
2526:
2521:
2515:
2514:
2472:
2470:
2469:
2464:
2454:
2453:
2388:
2386:
2385:
2380:
2378:
2376:
2375:
2366:
2365:
2360:
2359:
2358:
2355:
2347:
2338:
2336:
2335:
2330:
2328:
2327:
2307:
2305:
2304:
2299:
2297:
2296:
2268:natural log of 2
2265:
2263:
2262:
2257:
2229:
2227:
2226:
2221:
2205:
2203:
2202:
2197:
2181:
2179:
2178:
2173:
2158:
2156:
2155:
2150:
2142:
2140:
2139:
2138:
2122:
2121:
2111:
2110:
2109:
2097:
2096:
2086:
2075:
2073:
2072:
2071:
2068:
2059:
2058:
2055:
2048:
2047:
2044:
2038:
2022:
2008:
2006:
2005:
2000:
1982:
1980:
1979:
1974:
1972:
1970:
1960:
1959:
1943:
1942:
1908:
1903:
1901:
1900:
1899:
1896:
1887:
1886:
1883:
1873:
1855:
1853:
1852:
1847:
1829:
1827:
1826:
1821:
1813:
1812:
1782:
1781:
1778:
1759:
1757:
1756:
1751:
1740:
1739:
1727:
1726:
1693:
1692:
1689:
1670:
1668:
1667:
1662:
1660:
1659:
1636:
1635:
1631:
1619:
1618:
1614:
1602:
1601:
1597:
1581:
1580:
1576:
1568:
1566:
1565:
1560:
1558:
1557:
1538:
1537:
1533:
1525:
1523:
1522:
1517:
1515:
1514:
1498:
1496:
1495:
1490:
1488:
1487:
1461:
1460:
1456:
1444:
1442:
1441:
1436:
1424:
1422:
1421:
1416:
1411:
1410:
1394:
1392:
1391:
1386:
1384:
1383:
1355:
1348:
1341:
1334:
1322:
1315:
1308:
1301:
1289:
1282:
1275:
1268:
1256:
1249:
1242:
1235:
1223:
1216:
1209:
1202:
1190:
1183:
1176:
1169:
1157:
1150:
1143:
1136:
1099:
971:pulse generation
939:
927:
835:
834:
830:
776:
775:
771:
727:
715:
641:
640:
636:
625:
624:
620:
600:
552:Pin description
543:
537:
528:
507:
495:
483:
464:
458:
450:
436:
426:
416:
404:
403:
399:
383:
382:
378:
369:
368:
364:
352:
345:
321:
147:
128:
87:
80:
70:
67:
61:
38:
30:
21:
7174:
7173:
7169:
7168:
7167:
7165:
7164:
7163:
7139:
7138:
7137:
7132:
7111:
7107:VLSI Technology
7085:
7066:Signetics 8X300
6997:
6992:
6935:- Tony van Roon
6923:
6764:IC 555 Projects
6664:
6662:Further reading
6659:
6658:
6651:
6636:
6635:
6628:
6610:
6597:
6596:
6592:
6575:
6574:
6570:
6553:
6552:
6548:
6529:
6528:
6524:
6507:
6506:
6502:
6483:
6482:
6478:
6461:
6460:
6456:
6437:
6436:
6432:
6424:
6417:
6416:
6412:
6404:
6400:. August 2021.
6393:
6389:
6388:
6384:
6376:
6363:
6359:
6358:
6351:
6343:
6330:
6326:
6325:
6318:
6310:
6297:
6293:
6292:
6288:
6280:
6267:
6263:
6262:
6258:
6243:
6242:
6238:
6230:
6219:
6215:
6214:
6210:
6202:
6189:
6185:
6184:
6180:
6162:
6161:
6157:
6144:
6143:
6139:
6131:
6120:
6116:
6115:
6111:
6103:
6090:
6086:
6085:
6076:
6068:
6055:
6051:
6050:
6043:
6032:Electronics Hub
6026:
6025:
6021:
6014:
5999:
5998:
5994:
5986:
5973:
5969:
5968:
5961:
5954:
5939:
5938:
5934:
5927:
5911:
5910:
5901:
5894:
5878:
5877:
5862:
5854:
5841:
5837:
5836:
5817:
5809:
5796:
5792:
5791:
5784:
5776:
5772:. August 2016.
5763:
5759:
5758:
5751:
5743:
5730:
5726:
5725:
5718:
5710:
5697:
5693:
5692:
5681:
5673:
5660:
5656:
5655:
5628:
5619:
5617:
5609:
5608:
5604:
5595:
5593:
5588:
5587:
5583:
5574:
5572:
5551:
5550:
5546:
5528:
5515:
5514:
5510:
5492:
5479:
5478:
5474:
5464:
5449:
5448:
5444:
5435:
5433:
5427:
5426:
5422:
5400:
5399:
5386:
5352:
5351:
5347:
5330:(in Japanese).
5325:
5324:
5317:
5307:
5292:
5291:
5287:
5272:
5271:
5262:
5252:
5250:
5241:
5240:
5233:
5218:
5217:
5180:
5172:
5159:
5155:
5154:
5133:
5128:
5123:
5122:
5114:
5110:
5102:
5098:
5093:
5024:
5017:
5014:
4980:
4961:
4960:
4949:
4948:
4937:
4936:
4922:
4909:
4908:
4897:
4896:
4879:
4792:
4785:
4371:First 558 timer
4330:First 556 timer
4281:First 555 timer
3961:
3957:
3955:
3953:
3946:
3936:
3927:
3922:
3917:
3912:
3907:
3895:
3872:
3840:
3822:
3804:
3763:
3706:
3696:
3687:
3683:
3682:
3680:
3671:
3667:
3666:
3664:
3655:
3651:
3650:
3629:
3624:
3623:
3602:
3597:
3596:
3571:Schmitt trigger
3567:
3561:
3560:
3549:
3548:
3537:
3517:
3515:
3506:
3502:
3498:
3494:
3490:
3471:
3461:
3459:Set-Reset latch
3455:
3454:
3437:
3436:
3421:
3411:
3407:
3403:
3399:
3392:
3388:
3384:
3380:
3373:
3369:
3365:
3361:
3360:ms (2.5x) ≅ 100
3357:
3346:
3342:
3338:
3334:
3327:
3323:
3319:
3315:
3314:ms (1.5x) ≅ 100
3311:
3302:
3298:
3294:
3286:
3282:
3278:
3274:
3263:
3259:
3255:
3247:
3234:
3230:
3226:
3217:
3213:
3209:
3201:
3197:
3189:
3136:10 ms (−0.026%)
3086:
3045:
3044:
3021:
3020:
2997:
2996:
2941:
2940:
2935:
2926:
2922:
2921:
2898:
2897:
2891:
2882:
2878:
2877:
2874:
2868:
2867:
2856:
2855:
2844:
2829:
2821:
2814:
2810:
2806:
2802:
2798:
2791:
2787:
2783:
2779:
2768:
2761:
2734:
2713:
2712:
2710:
2703:
2695:
2691:
2681:
2677:
2676:
2674:
2636:
2616:
2599:
2598:
2587:
2570:
2565:
2559:
2540:
2535:
2534:
2506:
2485:
2484:
2482:
2445:
2424:
2423:
2421:
2417:
2413:
2400:
2367:
2350:
2348:
2341:
2340:
2319:
2314:
2313:
2288:
2283:
2282:
2236:
2235:
2212:
2211:
2188:
2187:
2182:is the time in
2164:
2163:
2130:
2113:
2112:
2101:
2088:
2087:
2063:
2050:
2049:
2039:
2014:
2013:
1991:
1990:
1951:
1934:
1912:
1891:
1878:
1877:
1861:
1860:
1838:
1837:
1804:
1773:
1768:
1767:
1731:
1718:
1684:
1679:
1678:
1651:
1646:
1645:
1643:
1633:
1629:
1628:
1626:
1616:
1612:
1611:
1609:
1599:
1595:
1594:
1588:
1578:
1574:
1573:
1549:
1544:
1543:
1535:
1531:
1530:
1506:
1501:
1500:
1479:
1474:
1473:
1468:
1458:
1454:
1453:
1427:
1426:
1402:
1397:
1396:
1375:
1370:
1369:
1353:
1346:
1339:
1332:
1320:
1313:
1306:
1299:
1287:
1280:
1273:
1266:
1254:
1247:
1240:
1233:
1221:
1214:
1207:
1200:
1188:
1181:
1174:
1167:
1155:
1148:
1141:
1134:
1123:
1116:
1091:
1085:
1084:
1073:
1072:
1061:
1049:. Application:
1043:Schmitt trigger
1029:set-reset latch
1014:pulse generator
950:
943:
940:
931:
928:
903:
898:
897:
888:
867:
862:
857:
852:
841:
832:
828:
827:
825:
816:
811:
806:
801:
782:
773:
769:
768:
765:voltage divider
760:
755:
750:
745:
734:
725:
721:
716:
713:
709:
704:
693:
686:
673:
668:
663:
658:
647:
638:
634:
633:
631:
622:
618:
617:
615:
606:
601:
598:
594:
589:
572:
567:
562:
541:
535:
518:
511:
508:
499:
496:
487:
484:
462:
456:
448:
439:set-reset latch
434:
424:
414:
408:
401:
397:
396:
394:
387:
380:
376:
375:
373:
366:
362:
361:
350:
343:
336:voltage divider
329:
320:Voltage divider
319:
305:
262:
253:
197:
148:
126:
96:
92:NE555 in 8-pin
71:
65:
62:
55:
43:This article's
39:
28:
23:
22:
15:
12:
11:
5:
7172:
7170:
7162:
7161:
7156:
7151:
7141:
7140:
7134:
7133:
7131:
7130:
7125:
7119:
7117:
7113:
7112:
7110:
7109:
7104:
7099:
7093:
7091:
7087:
7086:
7084:
7083:
7078:
7073:
7068:
7063:
7061:Signetics 2650
7058:
7053:
7048:
7043:
7038:
7033:
7028:
7023:
7018:
7013:
7007:
7005:
6999:
6998:
6993:
6991:
6990:
6983:
6976:
6968:
6962:
6961:
6956:
6951:
6941:
6936:
6930:
6922:
6921:External links
6919:
6918:
6917:
6909:
6908:
6904:
6903:
6893:978-0672210358
6878:
6861:
6844:
6838:978-0945053293
6823:
6813:978-1589397187
6805:Hans Camenzind
6798:
6781:
6780:
6776:
6775:
6772:978-0859340472
6761:
6758:978-0810456884
6747:
6737:978-0672219320
6722:
6705:
6702:978-0434912919
6691:
6681:978-8176567909
6669:
6668:
6663:
6660:
6657:
6656:
6649:
6626:
6608:
6590:
6568:
6546:
6522:
6500:
6476:
6454:
6430:
6410:
6382:
6349:
6316:
6286:
6256:
6236:
6208:
6178:
6155:
6137:
6109:
6099:. March 2017.
6074:
6041:
6019:
6012:
5992:
5959:
5952:
5932:
5926:978-0672210358
5925:
5913:Lancaster, Don
5899:
5893:978-0672219320
5892:
5860:
5815:
5782:
5749:
5716:
5679:
5626:
5602:
5581:
5544:
5526:
5508:
5490:
5472:
5462:
5442:
5420:
5384:
5345:
5315:
5305:
5285:
5260:
5231:
5178:
5130:
5129:
5127:
5124:
5121:
5120:
5108:
5095:
5094:
5092:
5089:
5088:
5087:
5074:
5065:
5056:
5051:
5046:
5041:
5036:
5030:
5029:
5013:
5010:
5009:
5008:
5001:open-collector
4997:
4994:
4991:
4988:
4985:
4982:
4978:
4951:
4950:
4939:
4938:
4924:
4923:
4921:
4920:558 quad timer
4918:
4899:
4898:
4881:
4880:
4878:
4877:556 dual timer
4875:
4874:
4873:
4872:
4871:
4861:
4847:
4837:
4830:
4820:
4803:
4795:
4790:
4783:
4777:
4774:
4770:
4769:
4763:
4762:
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4753:
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4747:
4744:
4741:
4738:
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4730:
4727:
4723:
4722:
4720:
4717:
4714:
4711:
4708:
4705:
4702:
4699:
4696:
4693:
4689:
4688:
4686:
4683:
4680:
4677:
4674:
4671:
4668:
4665:
4662:
4659:
4655:
4654:
4652:
4650:
4647:
4644:
4641:
4638:
4635:
4632:
4629:
4626:
4622:
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4619:
4617:
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4608:
4605:
4602:
4599:
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4577:
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4505:
4502:
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4487:
4483:
4482:
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4478:
4475:
4472:
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4466:
4463:
4460:
4457:
4454:
4450:
4449:
4447:
4445:
4442:
4439:
4436:
4433:
4430:
4427:
4424:
4421:
4414:
4413:
4411:
4408:
4405:
4402:
4399:
4396:
4393:
4390:
4387:
4384:
4377:
4376:
4374:
4368:
4365:
4362:
4359:
4356:
4353:
4350:
4347:
4342:
4336:
4335:
4333:
4327:
4324:
4321:
4318:
4315:
4312:
4309:
4306:
4301:
4295:
4294:
4292:
4278:
4275:
4272:
4269:
4266:
4263:
4260:
4257:
4252:
4244:
4243:
4241:
4239:
4236:
4233:
4230:
4227:
4224:
4221:
4218:
4215:
4211:
4210:
4208:
4206:
4203:
4200:
4197:
4194:
4191:
4188:
4185:
4182:
4176:
4175:
4173:
4170:
4167:
4164:
4161:
4158:
4155:
4152:
4149:
4146:
4140:
4139:
4137:
4126:
4123:
4120:
4117:
4114:
4111:
4108:
4105:
4102:
4096:
4095:
4093:
4086:
4083:
4080:
4077:
4074:
4071:
4068:
4065:
4062:
4055:
4054:
4052:
4050:Hans Camenzind
4046:
4043:
4040:
4037:
4034:
4031:
4028:
4025:
4022:
4016:
4015:
4013:
4006:
4003:
4000:
3997:
3994:
3991:
3986:
3983:
3980:
3974:
3973:
3970:
3967:
3958:
3944:
3938:
3933:
3924:
3919:
3914:
3909:
3904:
3894:
3891:
3888:
3887:
3881:
3875:
3874:
3869:
3865:
3864:
3858:
3854:
3853:
3850:
3846:
3845:
3842:
3838:
3831:
3830:
3824:
3820:
3813:
3812:
3806:
3802:
3795:
3794:
3791:
3787:
3786:
3783:
3762:
3761:Specifications
3759:
3705:
3702:
3694:
3678:
3662:
3636:
3632:
3609:
3605:
3582:open-collector
3551:
3550:
3539:
3538:
3536:
3533:
3513:
3480:open-collector
3439:
3438:
3423:
3422:
3420:
3417:
3416:
3415:
3396:
3377:
3354:
3331:
3308:
3290:
3271:
3239:
3238:
3223:
3205:
3177:
3176:
3173:
3170:
3169:10 s (−0.026%)
3166:
3165:
3162:
3159:
3155:
3154:
3151:
3148:
3144:
3143:
3140:
3137:
3133:
3132:
3129:
3126:
3125:1 ms (−0.026%)
3122:
3121:
3118:
3115:
3111:
3110:
3105:
3100:
3085:
3084:Example Values
3082:
3064:
3061:
3058:
3055:
3052:
3028:
3004:
2993:
2992:
2981:
2978:
2975:
2972:
2969:
2966:
2963:
2960:
2957:
2954:
2951:
2948:
2933:
2905:
2889:
2858:
2857:
2846:
2845:
2843:
2840:
2828:
2825:
2819:
2812:
2808:
2804:
2800:
2796:
2789:
2785:
2781:
2777:
2766:
2759:
2747:
2741:
2737:
2732:
2729:
2726:
2723:
2720:
2708:
2701:
2693:
2689:
2672:
2666:
2665:
2654:
2651:
2648:
2643:
2639:
2635:
2631:
2619:
2614:
2611:
2602:
2590:
2585:
2582:
2573:
2568:
2562:
2558:
2555:
2552:
2543:
2519:
2513:
2509:
2504:
2501:
2498:
2495:
2492:
2480:
2462:
2458:
2452:
2448:
2443:
2440:
2437:
2434:
2431:
2419:
2415:
2411:
2399:
2396:
2395:
2394:
2374:
2370:
2364:
2353:
2326:
2322:
2308:requirements:
2295:
2291:
2255:
2252:
2249:
2246:
2243:
2219:
2195:
2171:
2160:
2159:
2148:
2145:
2137:
2133:
2128:
2125:
2120:
2116:
2108:
2104:
2100:
2095:
2091:
2084:
2081:
2078:
2066:
2062:
2053:
2042:
2036:
2033:
2030:
2027:
2021:
1998:
1984:
1983:
1969:
1966:
1963:
1958:
1954:
1949:
1946:
1941:
1937:
1933:
1930:
1927:
1924:
1921:
1918:
1915:
1911:
1906:
1894:
1890:
1881:
1876:
1871:
1868:
1845:
1831:
1830:
1819:
1816:
1811:
1807:
1803:
1800:
1797:
1794:
1791:
1788:
1785:
1776:
1761:
1760:
1749:
1746:
1743:
1738:
1734:
1730:
1725:
1721:
1717:
1714:
1711:
1708:
1705:
1702:
1699:
1696:
1687:
1658:
1654:
1641:
1624:
1607:
1591:
1590:
1586:
1570:
1556:
1552:
1540:
1527:
1513:
1509:
1486:
1482:
1470:
1466:
1434:
1414:
1409:
1405:
1382:
1378:
1361:
1360:
1357:
1350:
1343:
1336:
1328:
1327:
1324:
1317:
1310:
1303:
1295:
1294:
1291:
1284:
1277:
1270:
1262:
1261:
1258:
1251:
1244:
1237:
1229:
1228:
1225:
1218:
1211:
1204:
1196:
1195:
1192:
1185:
1178:
1171:
1163:
1162:
1159:
1152:
1145:
1138:
1130:
1129:
1124:
1121:
1118:
1114:
1110:
1105:
1075:
1074:
1063:
1062:
1060:
1057:
1056:
1055:
1054:
1053:
1040:
1039:
1038:
1022:
1021:
1020:
1007:
1006:
1005:
1004:
1003:
982:
949:
946:
945:
944:
941:
934:
932:
929:
922:
917:
916:
904:
901:
899:
895:
891:
889:
886:
884:
880:
879:
872:open-collector
868:
865:
863:
860:
858:
855:
853:
850:
848:
844:
843:
839:
823:
817:
814:
812:
809:
807:
804:
802:
799:
797:
793:
792:
780:
761:
758:
756:
753:
751:
748:
746:
743:
741:
737:
736:
732:
722:
719:
717:
712:
710:
707:
705:
702:
700:
696:
695:
691:
684:
674:
671:
669:
666:
664:
661:
659:
656:
654:
650:
649:
645:
629:
613:
609:Trigger: when
607:
604:
602:
597:
595:
592:
590:
587:
585:
581:
580:
573:
570:
568:
565:
563:
560:
558:
554:
553:
550:
547:
544:
538:
532:
517:
514:
513:
512:
509:
502:
500:
497:
490:
488:
485:
478:
475:
474:
460:
446:
432:
422:
412:
411:
410:
406:
392:
389:
385:
371:
327:
324:supply voltage
304:
301:
261:
258:
252:
249:
229:1970 recession
217:Hans Camenzind
196:
193:
151:
150:
140:
139:
133:
132:
129:
123:
122:
119:Hans Camenzind
116:
112:
111:
102:
98:
97:
88:
73:
72:
52:the key points
42:
40:
33:
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
7171:
7160:
7157:
7155:
7152:
7150:
7147:
7146:
7144:
7129:
7126:
7124:
7121:
7120:
7118:
7114:
7108:
7105:
7103:
7100:
7098:
7095:
7094:
7092:
7088:
7082:
7081:Vybrid Series
7079:
7077:
7074:
7072:
7069:
7067:
7064:
7062:
7059:
7057:
7054:
7052:
7049:
7047:
7044:
7042:
7039:
7037:
7034:
7032:
7029:
7027:
7024:
7022:
7019:
7017:
7014:
7012:
7009:
7008:
7006:
7004:
7000:
6996:
6989:
6984:
6982:
6977:
6975:
6970:
6969:
6966:
6960:
6957:
6955:
6952:
6950:
6946:
6942:
6940:
6937:
6934:
6931:
6928:
6925:
6924:
6920:
6915:
6914:"Derivatives"
6912:See links in
6911:
6910:
6906:
6905:
6901:
6900:
6894:
6890:
6886:
6885:Don Lancaster
6882:
6879:
6876:
6875:
6869:
6865:
6862:
6859:
6858:
6852:
6848:
6845:
6839:
6835:
6831:
6827:
6824:
6821:
6820:
6814:
6810:
6806:
6802:
6799:
6796:
6795:
6789:
6787:
6783:
6782:
6778:
6777:
6773:
6769:
6765:
6762:
6759:
6755:
6751:
6748:
6745:
6744:
6738:
6734:
6730:
6726:
6723:
6720:
6719:
6713:
6709:
6706:
6703:
6699:
6695:
6692:
6689:
6688:
6682:
6678:
6674:
6671:
6670:
6666:
6665:
6661:
6652:
6646:
6642:
6641:
6633:
6631:
6627:
6623:
6619:
6615:
6611:
6609:0-07-030415-7
6605:
6601:
6594:
6591:
6586:
6582:
6581:LEDs Magazine
6578:
6572:
6569:
6564:
6560:
6556:
6550:
6547:
6542:
6538:
6537:
6532:
6526:
6523:
6518:
6514:
6510:
6504:
6501:
6496:
6492:
6491:
6486:
6480:
6477:
6472:
6468:
6464:
6458:
6455:
6450:
6446:
6445:
6444:Business Wire
6440:
6434:
6431:
6423:
6422:
6414:
6411:
6403:
6399:
6392:
6386:
6383:
6375:
6371:
6370:
6362:
6356:
6354:
6350:
6342:
6338:
6337:
6329:
6323:
6321:
6317:
6309:
6305:
6304:
6296:
6290:
6287:
6279:
6276:. June 2015.
6275:
6274:
6266:
6260:
6257:
6252:
6251:
6246:
6240:
6237:
6229:
6225:
6218:
6212:
6209:
6201:
6198:. July 2006.
6197:
6196:
6188:
6182:
6179:
6174:
6170:
6166:
6159:
6156:
6151:
6147:
6141:
6138:
6130:
6127:. July 2012.
6126:
6119:
6113:
6110:
6102:
6098:
6097:
6089:
6083:
6081:
6079:
6075:
6067:
6063:
6062:
6054:
6048:
6046:
6042:
6037:
6033:
6029:
6023:
6020:
6015:
6009:
6005:
6004:
5996:
5993:
5985:
5981:
5980:
5972:
5966:
5964:
5960:
5955:
5949:
5945:
5944:
5936:
5933:
5928:
5922:
5918:
5914:
5908:
5906:
5904:
5900:
5895:
5889:
5885:
5881:
5875:
5873:
5871:
5869:
5867:
5865:
5861:
5853:
5850:. June 2006.
5849:
5848:
5840:
5834:
5832:
5830:
5828:
5826:
5824:
5822:
5820:
5816:
5808:
5804:
5803:
5795:
5789:
5787:
5783:
5775:
5771:
5770:
5762:
5756:
5754:
5750:
5742:
5739:. July 2016.
5738:
5737:
5729:
5723:
5721:
5717:
5709:
5705:
5704:
5696:
5690:
5688:
5686:
5684:
5680:
5672:
5668:
5667:
5659:
5653:
5651:
5649:
5647:
5645:
5643:
5641:
5639:
5637:
5635:
5633:
5631:
5627:
5616:
5612:
5606:
5603:
5591:
5585:
5582:
5571:
5567:
5563:
5559:
5558:IEEE Spectrum
5555:
5548:
5545:
5541:
5537:
5533:
5529:
5527:0-02-410622-4
5523:
5519:
5512:
5509:
5505:
5501:
5497:
5493:
5491:0-13-211657-X
5487:
5483:
5476:
5473:
5469:
5465:
5459:
5455:
5454:
5446:
5443:
5431:
5424:
5421:
5416:
5412:
5408:
5404:
5403:IEEE Spectrum
5397:
5395:
5393:
5391:
5389:
5385:
5380:
5376:
5372:
5368:
5364:
5360:
5359:IEEE Spectrum
5356:
5349:
5346:
5341:
5337:
5333:
5329:
5322:
5320:
5316:
5312:
5308:
5302:
5298:
5297:
5289:
5286:
5281:
5280:
5275:
5269:
5267:
5265:
5261:
5249:
5245:
5238:
5236:
5232:
5227:
5226:
5221:
5215:
5213:
5211:
5209:
5207:
5205:
5203:
5201:
5199:
5197:
5195:
5193:
5191:
5189:
5187:
5185:
5183:
5179:
5171:
5167:
5166:
5158:
5152:
5150:
5148:
5146:
5144:
5142:
5140:
5138:
5136:
5132:
5125:
5117:
5112:
5109:
5105:
5100:
5097:
5090:
5086:
5082:
5078:
5075:
5073:
5069:
5066:
5064:
5060:
5057:
5055:
5052:
5050:
5047:
5045:
5042:
5040:
5037:
5035:
5032:
5031:
5027:
5021:
5016:
5011:
5006:
5002:
4998:
4995:
4992:
4989:
4986:
4983:
4977:
4973:
4972:
4971:
4968:
4966:
4955:
4943:
4933:
4928:
4919:
4917:
4915:
4903:
4893:
4889:
4885:
4876:
4869:
4865:
4862:
4859:
4855:
4851:
4848:
4845:
4841:
4838:
4835:
4831:
4828:
4824:
4821:
4818:
4814:
4810:
4807:
4806:
4804:
4801:
4796:
4789:
4782:
4778:
4775:
4772:
4771:
4767:
4766:
4761:
4758:
4754:
4751:
4748:
4745:
4742:
4739:
4737:
4734:
4731:
4728:
4725:
4724:
4721:
4718:
4715:
4712:
4709:
4706:
4703:
4700:
4697:
4694:
4691:
4690:
4687:
4684:
4681:
4678:
4675:
4672:
4669:
4666:
4663:
4660:
4657:
4656:
4653:
4651:
4648:
4645:
4642:
4639:
4636:
4633:
4630:
4627:
4624:
4623:
4620:
4618:
4615:
4612:
4609:
4606:
4603:
4600:
4597:
4594:
4591:
4590:
4587:
4584:
4581:
4578:
4575:
4572:
4569:
4566:
4563:
4560:
4557:
4556:
4553:
4550:
4547:
4544:
4541:
4538:
4535:
4532:
4529:
4526:
4523:
4522:
4519:
4516:
4512:
4509:
4506:
4503:
4500:
4497:
4494:
4491:
4488:
4485:
4484:
4481:
4479:
4476:
4473:
4470:
4467:
4464:
4461:
4458:
4455:
4452:
4451:
4448:
4446:
4443:
4440:
4437:
4434:
4431:
4428:
4425:
4422:
4419:
4416:
4415:
4412:
4409:
4406:
4403:
4400:
4397:
4394:
4391:
4388:
4385:
4382:
4379:
4378:
4375:
4372:
4369:
4366:
4363:
4360:
4357:
4354:
4351:
4348:
4346:
4343:
4341:
4338:
4337:
4334:
4331:
4328:
4325:
4322:
4319:
4316:
4313:
4310:
4307:
4305:
4302:
4300:
4297:
4296:
4293:
4290:
4286:
4282:
4279:
4276:
4273:
4270:
4267:
4264:
4261:
4258:
4256:
4253:
4251:
4250:
4246:
4245:
4242:
4240:
4237:
4234:
4231:
4228:
4225:
4222:
4219:
4216:
4213:
4212:
4209:
4207:
4204:
4201:
4198:
4195:
4192:
4189:
4186:
4183:
4181:
4178:
4177:
4174:
4171:
4168:
4165:
4162:
4159:
4156:
4153:
4150:
4147:
4145:
4142:
4141:
4138:
4136:-10 packages.
4135:
4131:
4127:
4124:
4121:
4118:
4115:
4112:
4109:
4106:
4103:
4101:
4098:
4097:
4094:
4091:
4087:
4084:
4081:
4078:
4075:
4072:
4069:
4066:
4063:
4060:
4057:
4056:
4053:
4051:
4047:
4044:
4041:
4038:
4035:
4032:
4029:
4026:
4023:
4021:
4018:
4017:
4014:
4011:
4007:
4004:
4001:
3998:
3995:
3992:
3990:
3987:
3984:
3981:
3979:
3976:
3975:
3965:
3959:
3951:
3947:
3943:
3939:
3934:
3931:
3925:
3920:
3915:
3910:
3905:
3902:
3901:
3898:
3892:
3886:
3882:
3880:
3877:
3876:
3870:
3867:
3866:
3863:
3859:
3856:
3855:
3851:
3848:
3847:
3843:
3837:
3833:
3832:
3829:
3825:
3819:
3815:
3814:
3811:
3807:
3801:
3797:
3796:
3792:
3789:
3788:
3784:
3781:
3780:
3777:
3772:
3767:
3760:
3758:
3756:
3752:
3747:
3745:
3741:
3736:
3733:
3731:
3727:
3723:
3715:
3710:
3703:
3701:
3698:
3693:
3677:
3661:
3634:
3630:
3607:
3603:
3594:
3589:
3587:
3583:
3579:
3575:
3574:inverter gate
3572:
3566:
3565:Inverter gate
3555:
3543:
3534:
3532:
3530:
3526:
3521:
3512:
3487:
3485:
3481:
3477:
3469:
3466:
3460:
3450:
3447:
3443:
3432:
3427:
3418:
3402:ms (4x) ≅ 100
3397:
3383:ms (3x) ≅ 100
3378:
3355:
3352:
3337:ms (2x) ≅ 100
3332:
3309:
3306:
3297:ms (1x) ≅ 100
3291:
3272:
3269:
3253:
3245:
3244:
3243:
3224:
3221:
3206:
3195:
3187:
3186:
3185:
3182:
3174:
3171:
3168:
3167:
3163:
3160:
3158:1 s (−0.026%)
3157:
3156:
3152:
3149:
3146:
3145:
3141:
3138:
3135:
3134:
3130:
3127:
3124:
3123:
3119:
3116:
3113:
3112:
3109:
3106:
3104:
3101:
3099:
3096:
3095:
3092:
3091:common values
3083:
3081:
3078:
3059:
3053:
3050:
3042:
3026:
3018:
3002:
2979:
2976:
2973:
2970:
2967:
2961:
2955:
2952:
2949:
2946:
2939:
2938:
2937:
2932:
2919:
2903:
2895:
2888:
2873:
2862:
2850:
2841:
2839:
2837:
2834:
2826:
2823:
2818:
2795:
2776:
2770:
2765:
2745:
2739:
2735:
2727:
2721:
2718:
2707:
2699:
2688:
2671:
2652:
2649:
2646:
2641:
2637:
2633:
2629:
2617:
2612:
2609:
2600:
2588:
2583:
2580:
2571:
2566:
2560:
2556:
2553:
2550:
2541:
2533:
2532:
2531:
2517:
2511:
2507:
2499:
2493:
2490:
2479:
2476:
2460:
2456:
2450:
2446:
2438:
2432:
2429:
2409:
2405:
2397:
2392:
2372:
2368:
2362:
2351:
2324:
2320:
2311:
2310:
2309:
2293:
2289:
2275:
2271:
2269:
2250:
2244:
2241:
2233:
2217:
2209:
2193:
2185:
2169:
2146:
2143:
2135:
2131:
2126:
2123:
2118:
2114:
2106:
2102:
2098:
2093:
2089:
2082:
2079:
2076:
2064:
2060:
2051:
2040:
2034:
2019:
2012:
2011:
2010:
2009:is given by:
1996:
1989:
1967:
1964:
1956:
1952:
1947:
1944:
1939:
1935:
1928:
1922:
1916:
1913:
1909:
1904:
1892:
1888:
1879:
1874:
1869:
1866:
1859:
1858:
1857:
1843:
1836:
1817:
1814:
1809:
1805:
1801:
1795:
1789:
1786:
1783:
1774:
1766:
1765:
1764:
1747:
1744:
1736:
1732:
1728:
1723:
1719:
1712:
1706:
1700:
1697:
1694:
1685:
1677:
1676:
1675:
1672:
1656:
1652:
1640:
1623:
1606:
1585:
1571:
1554:
1550:
1541:
1528:
1511:
1507:
1484:
1480:
1471:
1465:
1451:
1450:
1449:
1446:
1432:
1412:
1407:
1403:
1380:
1376:
1366:
1358:
1351:
1344:
1337:
1335:kHz (+0.048%)
1330:
1329:
1325:
1318:
1311:
1304:
1302:kHz (+0.048%)
1297:
1296:
1292:
1285:
1278:
1271:
1269:kHz (+0.048%)
1264:
1263:
1259:
1252:
1245:
1238:
1231:
1230:
1226:
1219:
1212:
1205:
1198:
1197:
1193:
1186:
1179:
1172:
1165:
1164:
1160:
1153:
1146:
1139:
1132:
1131:
1128:
1125:
1119:
1117:
1111:
1109:
1106:
1104:
1101:
1100:
1097:
1096:common values
1090:
1079:
1067:
1058:
1051:
1050:
1048:
1047:inverter gate
1044:
1041:
1036:
1033:
1032:
1030:
1026:
1023:
1018:
1017:
1015:
1011:
1008:
1001:
997:
993:
989:
988:
986:
983:
980:
976:
972:
968:
965:
964:
962:
958:
955:
954:
953:
947:
938:
933:
926:
921:
914:
910:
905:
900:
894:
890:
882:
881:
877:
873:
869:
864:
859:
854:
849:
846:
845:
838:
822:
818:
813:
808:
803:
798:
795:
794:
790:
787:
779:
766:
762:
757:
752:
747:
742:
739:
738:
731:
723:
718:
711:
706:
701:
698:
697:
690:
683:
679:
675:
670:
665:
660:
655:
652:
651:
644:
628:
612:
608:
603:
596:
591:
586:
583:
582:
578:
574:
569:
564:
556:
555:
551:
549:Pin direction
548:
545:
539:
533:
530:
529:
526:
523:
515:
506:
501:
494:
489:
482:
477:
472:
469:acting as an
468:
461:
454:
447:
444:
440:
433:
430:
423:
420:
413:
390:
359:
358:
356:
348:
341:
337:
333:
325:
318:
317:
316:
314:
310:
309:block diagram
307:The internal
302:
300:
297:
294:
290:
285:
283:
279:
275:
271:
267:
259:
257:
250:
248:
244:
242:
238:
232:
230:
226:
222:
218:
209:
201:
194:
192:
190:
186:
182:
178:
174:
170:
166:
162:
158:
146:
141:
138:
134:
130:
124:
120:
117:
113:
110:
106:
103:
99:
95:
91:
86:
81:
69:
59:
53:
51:
46:
41:
37:
32:
31:
19:
7090:Acquisitions
7011:555 timer IC
7010:
6898:
6881:TTL Cookbook
6880:
6873:
6863:
6856:
6846:
6830:Forrest Mims
6825:
6819:(Chapter 11)
6818:
6800:
6793:
6784:
6763:
6749:
6741:
6724:
6717:
6712:Forrest Mims
6707:
6693:
6686:
6672:
6639:
6621:
6599:
6593:
6580:
6571:
6558:
6549:
6534:
6525:
6512:
6503:
6488:
6479:
6457:
6442:
6433:
6420:
6413:
6397:
6385:
6367:
6339:. May 1988.
6334:
6308:the original
6301:
6289:
6271:
6259:
6248:
6239:
6223:
6211:
6193:
6181:
6168:
6158:
6149:
6140:
6124:
6112:
6094:
6066:the original
6059:
6031:
6022:
6003:308 Circuits
6002:
5995:
5977:
5942:
5935:
5917:TTL Cookbook
5916:
5883:
5845:
5800:
5767:
5734:
5708:the original
5701:
5664:
5618:. Retrieved
5614:
5605:
5594:. Retrieved
5584:
5573:. Retrieved
5564:(3): 42–47.
5561:
5557:
5547:
5539:
5517:
5511:
5503:
5481:
5475:
5467:
5452:
5445:
5434:. Retrieved
5423:
5409:(9): 80–85.
5406:
5402:
5365:(5): 34–43.
5362:
5358:
5348:
5331:
5327:
5310:
5295:
5288:
5277:
5251:. Retrieved
5247:
5223:
5163:
5111:
5099:
4975:
4969:
4962:
4910:
4866:was sold to
4852:was sold to
4842:was sold to
4825:was sold to
4811:was sold to
4787:
4780:
4459:Discontinued
4370:
4349:Discontinued
4344:
4339:
4329:
4303:
4298:
4291:-8 packages.
4280:
4254:
4247:
4132:, TSOT23-5,
4067:Discontinued
4048:Designed by
4027:Discontinued
3941:
3903:Manufacturer
3896:
3844:10 to 15 mA
3835:
3817:
3799:
3782:Part number
3775:
3748:
3737:
3734:
3719:
3699:
3691:
3675:
3659:
3590:
3568:
3522:
3510:
3488:
3462:
3391:kΩ (three 91
3364:nF and 227.5
3318:nF and 136.5
3292:
3258:nF and 22.75
3240:
3207:
3183:
3180:
2994:
2930:
2886:
2875:
2830:
2816:
2793:
2774:
2772:
2763:
2705:
2686:
2669:
2667:
2477:
2475:voltage drop
2401:
2280:
2161:
1985:
1832:
1762:
1673:
1638:
1621:
1604:
1592:
1583:
1463:
1447:
1367:
1364:
1236:Hz (+0.048%)
1203:Hz (+0.048%)
1170:Hz (+0.048%)
1137:Hz (+0.048%)
951:
892:
836:
820:
777:
729:
688:
681:
642:
626:
616:falls below
610:
519:
306:
298:
292:
288:
286:
263:
254:
245:
233:
214:
157:555 timer IC
156:
154:
78:555 timer IC
66:January 2024
63:
47:
45:lead section
7046:NXP ARM S32
6874:(Chapter 6)
6842:(Chapter 1)
5253:27 December
4768:Table notes
4517:-8 package.
4308:Active (TI)
4259:Active (TI)
4092:-8 package.
3954:at 5 V
3937:max. (volt)
3893:Derivatives
3790:IC Process
3410:kΩ (four 91
3368:kΩ ("two 91
3281:nF and 45.5
3262:kΩ (four 91
3250:ms (0.25x)
3077:natural log
2530:to become:
1833:Hence, the
1000:temperature
441:stores the
266:transistors
175:) or four (
94:DIP package
7143:Categories
7051:PowerQUICC
6949:monostable
6907:Datasheets
6727:; 2nd Ed;
6710:; 3rd Ed;
5880:Jung, Walt
5620:2022-02-27
5596:2020-08-28
5575:2020-08-29
5436:2010-04-05
5126:References
5034:RC circuit
4020:Diodes Inc
3972:Datasheet
3911:Production
3808:4.5 to 16
3681:and upper
3593:AC-coupled
3563:See also:
3465:active-low
3457:See also:
3446:Active-low
3406:nF and 364
3387:nF and 273
3345:kΩ (two 91
3341:nF and 182
3322:kΩ (one 91
3285:kΩ (two 91
3233:nF and 9.1
3200:nF and 910
2894:RC circuit
2872:RC circuit
2870:See also:
2842:Monostable
2404:duty cycle
2270:constant.
1988:duty cycle
1127:Duty cycle
1087:See also:
1010:Monostable
992:thermistor
467:transistor
429:comparator
419:comparator
169:oscillator
7116:Spin-offs
7102:Signetics
7021:GreenChip
6868:Signetics
6851:Signetics
6729:Walt Jung
6250:Signetics
5666:Signetics
5340:0040-9413
5279:Signetics
5225:Signetics
5005:push–pull
4932:Signetics
4850:Signetics
4779:For the "
4340:Signetics
4299:Signetics
4249:Signetics
4104:MIC1555/7
4100:Microchip
4008:Internal
3960:Frequency
3883:0 to 70 °
3860:600
3841:= +15 V)
3722:Signetics
3720:In 1972,
3578:push-pull
3476:push-pull
3301:nF and 91
3216:nF and 91
3054:
2974:⋅
2968:⋅
2956:
2722:
2647:⋅
2634:⋅
2610:−
2581:−
2557:
2494:
2433:
2391:Ohm's law
2281:Resistor
2245:
2144:⋅
2077:⋅
2029:%
1965:⋅
1929:⋅
1917:
1835:frequency
1815:⋅
1802:⋅
1790:
1745:⋅
1713:⋅
1701:
1103:Frequency
876:capacitor
861:DISCHARGE
810:THRESHOLD
678:push-pull
463:Discharge
453:push–pull
340:resistors
334:GND is a
313:schematic
274:resistors
272:, and 15
221:Signetics
183:and used
181:Signetics
90:Signetics
50:summarize
7128:Nexperia
7076:Nexperia
7071:TriMedia
7003:Products
6618:28676554
6585:Archived
6563:Archived
6561:. 2008.
6541:Archived
6517:Archived
6495:Archived
6471:Archived
6467:EE Times
6449:Archived
6402:Archived
6374:Archived
6341:Archived
6278:Archived
6228:Archived
6200:Archived
6173:Archived
6129:Archived
6101:Archived
6036:Archived
5984:Archived
5919:. Sams.
5915:(1974).
5882:(1977).
5852:Archived
5807:Archived
5774:Archived
5741:Archived
5703:Intersil
5671:Archived
5669:. 1973.
5536:33014077
5500:20218185
5379:20539726
5248:EE Times
5170:Archived
5012:See also
4860:in 2006.
4823:Intersil
4817:Motorola
4024:ZSCT1555
3823:= +5 V)
3793:Bipolar
3704:Packages
3468:SR latch
3449:SR latch
3431:SR latch
3268:parallel
3229:ms ≅ 100
1986:and the
1025:Bistable
546:Pin name
542:(unit 2)
536:(unit 1)
531:555 pin#
330:and the
115:Invented
7123:Ampleon
7041:NXP LPC
6945:astable
6253:. 1979.
5282:. 1972.
5228:. 1985.
4567:Bipolar
4533:Bipolar
4462:Bipolar
4429:Bipolar
4352:Bipolar
4311:Bipolar
4262:Bipolar
4217:ICM7556
4214:Renesas
4184:ICM7555
4180:Renesas
4154:Bipolar
4130:SOT23-5
4070:Bipolar
4030:Bipolar
3969:Remarks
3918:process
3852:200 mA
3826:3 to 6
3728:-8 and
3686:⁄
3670:⁄
3654:⁄
3212:ms ≅ 10
3075:is the
2925:⁄
2918:seconds
2881:⁄
2696:(which
2680:⁄
2266:is the
2184:seconds
1632:⁄
1615:⁄
1598:⁄
1577:⁄
1534:⁄
1457:⁄
1059:Astable
957:Astable
831:⁄
824:CONTROL
772:⁄
754:CONTROL
726:TRIGGER
637:⁄
630:CONTROL
621:⁄
614:TRIGGER
599:TRIGGER
407:CONTROL
400:⁄
393:CONTROL
379:⁄
365:⁄
278:silicon
195:History
7036:Ne-XVP
7031:MIFARE
6891:
6836:
6811:
6770:
6756:
6735:
6700:
6679:
6647:
6616:
6606:
6010:
5950:
5923:
5890:
5534:
5524:
5498:
5488:
5460:
5377:
5338:
5303:
4732:Active
4729:XTR655
4698:Active
4695:TLC556
4664:Active
4661:TLC555
4631:Active
4628:TLC552
4598:Active
4595:TLC551
4564:Active
4530:Active
4492:Active
4489:LMC555
4426:Active
4389:Active
4287:-8 or
4220:Active
4187:Active
4151:Active
4148:MC1455
4107:Active
4064:NJM555
4010:EEPROM
3985:Active
3982:CSS555
3962:max. (
3956:supply
3935:Supply
3928:min. (
3926:Supply
3921:Timers
3913:status
3908:number
3785:NE555
3412:
3408:
3404:
3400:
3393:
3389:
3385:
3381:
3374:
3370:
3366:
3362:
3358:
3351:series
3347:
3343:
3339:
3335:
3328:
3324:
3320:
3316:
3312:
3303:
3299:
3295:
3287:
3283:
3279:
3275:
3264:
3260:
3256:
3248:
3242:time.
3235:
3231:
3227:
3218:
3214:
3210:
3202:
3198:
3190:
3175:91 kΩ
3172:100 μF
3164:91 kΩ
3153:91 kΩ
3142:91 kΩ
3139:100 nF
3131:91 kΩ
3120:91 kΩ
3041:farads
2995:where
2762:is to
2668:where
2389:, per
2234:, and
2232:farads
2162:where
2023:
1637:
1620:
1603:
1582:
1462:
1359:52.8%
1354:
1347:
1340:
1333:
1326:52.8%
1321:
1314:
1307:
1300:
1293:52.8%
1288:
1281:
1274:
1267:
1260:52.8%
1255:
1248:
1241:
1234:
1227:52.8%
1222:
1215:
1208:
1201:
1194:52.8%
1189:
1182:
1175:
1168:
1161:52.8%
1156:
1149:
1142:
1135:
981:, etc.
866:Output
672:Output
667:OUTPUT
577:ground
522:pinout
516:Pinout
457:
449:Output
427:: The
417:: The
351:
344:
332:ground
270:diodes
260:Design
159:is an
121:(1971)
105:Active
18:555 IC
7056:QorIQ
6667:Books
6425:(PDF)
6405:(PDF)
6394:(PDF)
6377:(PDF)
6364:(PDF)
6344:(PDF)
6331:(PDF)
6311:(PDF)
6298:(PDF)
6281:(PDF)
6268:(PDF)
6231:(PDF)
6220:(PDF)
6203:(PDF)
6190:(PDF)
6132:(PDF)
6121:(PDF)
6104:(PDF)
6091:(PDF)
6069:(PDF)
6056:(PDF)
5987:(PDF)
5974:(PDF)
5855:(PDF)
5842:(PDF)
5810:(PDF)
5797:(PDF)
5777:(PDF)
5764:(PDF)
5744:(PDF)
5731:(PDF)
5711:(PDF)
5698:(PDF)
5674:(PDF)
5661:(PDF)
5375:S2CID
5173:(PDF)
5160:(PDF)
5116:ln(3)
5104:ln(2)
5091:Notes
4726:X-REL
4561:NE556
4527:NE555
4515:DSBGA
4456:LM556
4423:LM555
4386:TS555
4364:4800*
4345:NE558
4304:NE556
4255:NE555
4134:UTDFN
4061:(JRC)
3923:total
3755:SOT23
3740:TSSOP
3518:Reset
3495:RESET
3491:Reset
3161:10 μF
3128:10 nF
2892:. An
2820:diode
2815:C as
2801:diode
2782:diode
2760:diode
2702:diode
2673:diode
2622:diode
2593:diode
2481:diode
948:Modes
902:Power
815:Input
759:Input
720:Input
714:RESET
605:Input
571:Power
443:state
435:Latch
293:SE555
289:NE555
276:on a
165:timer
7026:i.MX
6889:ISBN
6834:ISBN
6809:ISBN
6768:ISBN
6754:ISBN
6733:ISBN
6698:ISBN
6677:ISBN
6645:ISBN
6614:OCLC
6604:ISBN
6008:ISBN
5948:ISBN
5921:ISBN
5888:ISBN
5532:OCLC
5522:ISBN
5496:OCLC
5486:ISBN
5458:ISBN
5336:ISSN
5301:ISBN
5255:2016
4974:One
4794:"*".
4701:CMOS
4667:CMOS
4634:CMOS
4601:CMOS
4582:0.1*
4579:6000
4548:0.1*
4545:3000
4495:CMOS
4474:6000
4441:3000
4420:(TI)
4392:CMOS
4383:(ST)
4367:0.1*
4326:0.1*
4323:6000
4277:0.1*
4274:3000
4223:CMOS
4190:CMOS
4169:0.1*
4166:3000
4125:5.0*
4110:CMOS
4085:0.1*
4082:3000
4045:0.33
3989:CMOS
3930:volt
3906:Part
3751:CMOS
3622:and
3529:Hi-Z
3433:mode
3150:1 μF
3117:1 nF
3098:Time
3017:ohms
2546:high
2208:ohms
2056:high
2045:high
1884:high
1690:high
1499:and
1395:and
540:556
534:556
520:The
437:: A
311:and
287:The
268:, 2
251:Name
241:TO-5
189:CMOS
155:The
131:1972
101:Type
5566:doi
5411:doi
5367:doi
4888:Die
4800:HFO
4752:4.0
4749:170
4746:5.5
4743:2.8
4736:SOI
4716:2.1
4713:340
4682:2.1
4679:170
4649:1.8
4646:340
4616:1.8
4613:170
4573:4.5
4539:4.5
4510:3.0
4507:100
4501:1.5
4477:0.1
4468:4.5
4444:0.1
4435:4.5
4407:2.7
4404:110
4358:4.5
4317:4.5
4289:TO5
4285:DIP
4268:4.5
4238:1.0
4205:1.0
4160:4.5
4122:240
4116:2.7
4090:SIP
4076:4.5
4042:150
4036:0.9
4005:1.0
4002:4.3
3999:5.5
3996:1.2
3964:MHz
3744:BGA
3730:TO5
3726:DIP
3714:DIP
3588:).
3507:Set
3499:Set
3486:).
3254:100
3246:2.5
3237:kΩ.
3204:kΩ,
3192:ms
2916:in
2685:of
2147:100
2080:100
2069:low
1897:low
1779:low
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