NE555

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Document overview

• Manufacturer or author: Diodes Incorporated
• PDF pages: 14

Technical content

Features

• Timing from microseconds to hours
• Astable or monostable operation
• Adjustable duty cycle
• TTL compatible output can source or sink up to 200mA
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen- and Antimony-Free. “Green” Device (Note 3)
• For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/ Pin Assignments Notes: 1. No purposely added lead. FullyEU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3).compliant. 2. See https://www.diodes.com/quality/lead-free/ formore information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. (Top View) SO-8 VCC DISCH THRES CONT OUT TRIG GND RESET

Document number: DS35112 Rev. 5 - 2 2 of 14 www.diodes.com February 2021 © Diodes Incorporated NE555 Pin Descriptions Pin Name Pin Number Description GND 1 Ground TRIG 2 Trigger set 1/3VCC OUT 3 Timer output RESET 4 Reset active low CONT 5 External adjustment of internal threshold and trigger voltages THRES 6 Threshold set to 2/3 VCC DISCH 7 Low impedance discharge path VCC 8 Chip supply voltage Functional Block Diagram RESET can override TRIG, which can override THRESH Functional Table RESET Nominal Trigger Voltage Threshold Voltage Output Discharge Switch Low Irrelevant Irrelevant Low On High <1/3VCC Irrelevant High Off High >1/3VCC >2/3VCC Low On High >1/3VCC <2/3VCC As previously established VCC CONT RESET THRES TRIG GND DISCH OUT S O

Document number: DS35112 Rev. 5 - 2 3 of 14 www.diodes.com February 2021 © Diodes Incorporated NE555 Absolute Maximum Ratings (Note 4) @ TA = 25°C unless otherwise stated Symbol Parameter Rating Unit VCC Supply voltage (Note 5) 18 V VI Input voltage CONT, RESET, THRES, TRIG VCC V IO Output current ±225 mA θJA Package thermal resistance Junction-to-Ambient (Note 6) 130 °C/W θJC Package thermal resistance Junction-to-Case (Note 7) 15 °C/W TJ Junction temperature 150 °C TSTG Storage temperature -65 to 150 °C Notes: 4. Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress rati ngs only. Functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 5. All voltage values are with respect ground. 6. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability. 7. Maximum power dissipation is a function of TJ(max), θJC, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TC)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability. Recommended Operating Conditions (TA = 25°C) Symbol Parameter Min Max Unit VCC Supply voltage 4.5 16 V VI Input voltage CONT, RESET, THRES, TRIG — VCC V IO Output current — ±200 mA TA Operating Ambient Temperature NE555 0 70 °C SA555 -40 85 NA555 -40 105 Electrical Characteristics (VCC = 5V to 15V, TA = 25°C unless otherwise stated) Symbol Parameter Test conditions Min Typ. Max Unit VTH Threshold voltage level VCC = 15V 8.8 10 11.2 V VCC = 5V 2.4 3.3 4.2 ITH Threshold current (Note 8) — — 30 250 nA VTR Trigger voltage level VCC = 15V 4.5 5 5.6 V VCC = 5V 1.1 1.67 2.2 ITR Trigger current TRIG at 0V — 0.5 2 µA VRST RESET voltage level — 0.3 0.7 1 V IRST RESET current RESET at VCC — 0.1 0.4 mA RESET at 0V — -0.4 -1.5 IDIS DISCH switch off-state current — — 20 100 nA VDIS DISCH saturation voltage with output low (Note 9) VCC = 15V, IDIS = 15mA — 180 480 mV VCC = 5V, IDIS = 4.5mA — 80 200 VCON CONT voltage (open circuit) VCC = 15V 9 10 11 V VCC = 5V 2.6 3.3 4 Notes: 8. This parameter influences the maximum value of the timing resistors R A and RB in the circuit of Figure 12. For example, when VCC = 5 V, the maximum value is R = RA + RB ≉ 3.4MΩ, and for VCC = 15 V, the maximum value is 10MΩ. 9. No protection against excessive pin 7 current is necessary providing package dissipation rating is not exceeded

Document number: DS35112 Rev. 5 - 2 4 of 14 www.diodes.com February 2021 © Diodes Incorporated NE555 Electrical Characteristics (VCC = 5V to 15V, TA = 25°C unless otherwise stated) Symbol Parameter Test conditions Min Typ. Max Unit VOL Low level output voltage VCC = 15V, IOL = 10mA — 0.1 0.25 V VCC = 15V, IOL = 50mA — 0.4 0.75 VCC = 15V, IOL = 100mA — 2 2.5 VCC = 15V, IOL = 200mA — 2.5 — VCC = 5V, IOL = 5mA — 0.1 0.35 VCC = 5V, IOL = 8mA — 0.15 0.4 VOH High level output voltage VCC = 15V, IOH = -100mA 12.75 13.3 — V VCC = 15V, IOH = -200mA — 12.5 — VCC = 5V, IOH = -100mA 2.75 3.3 — ICC Supply current Output low, no load VCC = 15V — 10 15 mA VCC = 5V — 3 6 Output high, no load VCC = 15V — 9 13 VCC = 5V — 2 5 TER Initial error of timing interval (Note 10) Each time, monostable (Note 11) — 1 3 % Each time, astable (Note 12) — 2.25 — TTC Temperature coefficient of timing interval Each time, monostable (Note 11) TA = full range — 50 — ppm/°C Each time, astable (Note 12) — 150 — TVCC Supply voltage sensitivity of timing interval Each time, monostable (Note 11) — 0.1 0.5 %/V Each time, astable (Note 12) — 0.3 — TRI Output pulse rise time CL = 15pF — — 300 ns TFA Output pulse fall time CL = 15pF — — 300 ns Notes: 10. Timing interval error is defined as the difference between the measured value and the average value of a random sample from each process run. 11. Values specified are for a device in a monostable circuit similar to Figure 9, with the following component values: R A = 2kΩ to 100kΩ, C = 0.1uF. 12. Values specified are for a device in an astable circuit similar to Figure 12, with the following component values: R A = 1kΩ to 100kΩ, C = 0.1uF.

Document number: DS35112 Rev. 5 - 2 5 of 14 www.diodes.com February 2021 © Diodes Incorporated NE555 Typical Performance Characteristics Low Level Output Voltage vs. Low Level Output Current @ VCC = 5V Low Level Output Voltage vs. Low Level Output Current @ VCC = 10V Low Level Output Voltage vs. Low Level Output Current @ VCC = 15V Drop Between Supply Voltage and Output vs. High Level Output Current

Document number: DS35112 Rev. 5 - 2 6 of 14 www.diodes.com February 2021 © Diodes Incorporated NE555 Typical Performance Characteristics (cont.) Supply Current vs. Supply Voltage Propagation Delay Time vs. Lowest Voltage Level of Trigger Pulse Normalized Output Pulse Duration (Monostable Mode) vs. Supply Voltage Normalized Output Pulse Duration (Monostable Mode) vs. Free-Air Temperature

Document number: DS35112 Rev. 5 - 2 7 of 14 www.diodes.com February 2021 © Diodes Incorporated NE555 Typical Applications Characteristics Monostable Operation For monostable operation, any of the ‘555 timers can be connected as shown in Figure 1. If the output is low, application of a negative-going pulse to the trigger (TRIG) sets the internal flip-flop and drives the output high. Capacitor C is then charged through RA until the voltage across the capacitor reaches the threshold voltage of the threshold (THRES) input. If TRIG has returned to a high level, the output of the threshold comparator resets the internal flip-flop, drives the output low, and discharges C. Fig. 1 Monostable operation Monostable operation is initiated when TRIG voltage falls below the trigger threshold. Once initiated, the sequence ends only if TRIG is high for at least 10μs before the end of the timing interval. When the trigger is grounded, the comparator storage time can be as long as 10μs, which limits the minimum monostable pulse width to 10μs. Because of the threshold level and saturation voltage of Q1, the output pulse duration is approximately tW = 1.1RAC. Figure 3 is a plot of the time constant for various values of RA and C. The threshold levels and charge rates both are directly proportional to the supply voltage, VCC. The timing interval is, therefore, independent of the supply voltage, so long as the supply voltage is constant during the time interval. Applying a negative-going trigger pulse simultaneously to RESET and TRIG during the timing interval discharges C and reinitiates the cycle, commencing on the positive edge of the reset pulse. The output is held low as long as the reset pulse is low. To prevent false triggering, when RESET is not used, it should be connected to VCC. Fig. 2 Typical Monostable Waveforms Fig. 3 Output Pulse Duration vs. Capacitance RLRA THRES TRIG DISCH RESET CONT VCC GND OUT Output VCC (5V to 15V) Input C

Document number: DS35112 Rev. 5 - 2 8 of 14 www.diodes.com February 2021 © Diodes Incorporated NE555 Typical Applications Characteristics (cont.) Astable Operation As shown in Figure 4, adding a second resistor, RB, to the circuit of Figure 1 and connecting the trigger input to the threshold input causes the timer to self-trigger and run as a multivibrator. The capacitor C charges through RA and RB and then discharges through RB. Therefore, the duty cycle is controlled by the values of RA and RB. This astable connection results in capacitor C charging and discharging between the threshold-voltage level (≉0.67VCC) and the trigger- voltage level (≉0.33VCC). As in the monostable circuit, charge and discharge times (and, therefore, the frequency and duty cycle) are independent of the supply voltage. C RLRA RB THRES TRIG DISCH RESET CONT VCC GND OUT Output Open (See Note A) VCC (5V to 15V) Decoupling CONT voltage to ground with a capacitor can improve operation. This should be evaluated for individual applications. 0.01µF Fig. 4 Circuit for Astable Operation Fig. 5 Typical Astable Waveforms Figure 5 shows typical waveforms generated during astable operation. The output high-level duration tH and low-level duration tL can be calculated as follows: tH = 0.693(RA +RB)C t L = 0.693(RB)C Other useful equations are: period = t H + tL = 0.693(RA + 2RB)C frequency = 1.44/(RA + 2RB)C output driver duty cycle = t L/(tH + tL) = RB/(RA + 2RB) output waveform duty cycle = tH/(tH + tL) = 1 – RB/(RA + 2RB) low to high ratio = t L/tH = RB/(RA + RB) Fig. 6 Free Running Frequency

Document number: DS35112 Rev. 5 - 2 9 of 14 www.diodes.com February 2021 © Diodes Incorporated NE555 Typical Applications Characteristics (cont.) Missing Pulse Detector The circuit shown in Figure 7 can be used to detect a missing pulse or abnormally long spacing between consecutive pulses in a train of pulses. The timing interval of the monostable circuit is retriggered continuously by the input pulse train as long as the pulse spacing is less than the timing interval. A longer pulse spacing, missing pulse, or terminated pulse train permits the timing interval to be completed, thereby generating an output pulse as shown in Figure 8. 0.01µF RL RA THRES TRIG DISCH RESET CONT VCC GND OUT Output2 VCC (5V to 15V) C Input Fig. 7 Circuit for Missing Pulse Detector Fig. 8 Timing Waveforms for Missing Pulse Detector Frequency Divider By adjusting the length of the timing cycle, the basic circuit of Figure 1 can be made to operate as a frequency divider. Figure 9 shows a divide-by-three circuit that makes use of the fact that retriggering cannot occur during the timing cycle. Fig. 9 Divide by Three Circuit Waveforms

Document number: DS35112 Rev. 5 - 2 10 of 14 www.diodes.com February 2021 © Diodes Incorporated NE555 Typical Applications Characteristics (cont.) Pulse Width Modulation The operation of the timer can be modified by modulating the internal threshold and trigger voltages, which is accomplished by applying an external voltage (or current) to CONT. Figure 10 shows a circuit for pulse-width modulation. A continuous input pulse train triggers the monostable circuit, and a control signal modulates the threshold voltage. Figure 11 shows the resulting output pulse-width modulation. While a sine-wave modulation signal is shown, any wave shape could be used. RL RA THRES TRIG DISCH RESET CONT VCC GND OUT Output2 VCC (5V to 15V) C Clock Input 6Modulation Input (see Note A) The modulating signal can be directly or capacitively coupled to CONT. For direct coupling, the effects of modulation source voltage and impedance on the bias of the timer should be considered. Fig. 10 Circuit for Pulse width modulation Fig. 11 Pulse width modulation timing diagrams Pulse Position Modulation As shown in Figure 12, any of these timers can be used as a pulse-position modulator. This application modulates the threshold voltage and, thereby, the time delay, of a free-running oscillator. Figure 13 shows a triangular-wave modulation signal for such a circuit; however, any wave shape could be used. RL RA THRES TRIG DISCH RESET CONT VCC GND OUT Output2 VCC (5V to 15V) C 6Modulation Input (see Note A) The modulating signal can be directly or capacitively coupled to CONT. For direct coupling, the effects of modulation source voltage and impedance on the bias of the timer should be considered. RB Fig. 12 Circuit for pulse position modulation Fig. 13 Pulse position modulation timing diagrams

Document number: DS35112 Rev. 5 - 2 11 of 14 www.diodes.com February 2021 © Diodes Incorporated NE555 Typical Applications Characteristics (cont.) Sequential Timer Many applications, such as computers, require signals for initializing conditions during start-up. Other applications, such as test equipment, require activation of test signals in sequence. These timing circuits can be connected to provide such sequential control. The timers can be used in various combinations of astable or monostable circuit connections, with or without modulation, for extremely flexible waveform control. Figure 14 shows a sequencer circuit with possible applications in many systems, and Figure 15 shows the output waveforms. Fig. 14 Circuit for Sequential Timer Fig. 15 Sequential timer waveforms RA THRES TRIG DISCH RESET CONT VCC GND OUT2 VCC CA Note A: S closes momentarily at t=0. 0.01 µF s 0.001 µF 33kΩ RB THRES TRIG DISCH RESET CONT VCC GND OUT2 CB 0.01 µF 0.001 µF 33kΩ Output A RC THRES TRIG DISCH RESET CONT VCC GND OUT2 CC 0.01 µF Output B Output C CA=10µF RA=100kΩ CB=4.7µF RB=100kΩ CC=14.7µF RC=100kΩ

Document number: DS35112 Rev. 5 - 2 12 of 14 www.diodes.com February 2021 © Diodes Incorporated NE555

Ordering Information

(Note 13) 13” Tape and Reel Quantity Part Number Suffix NE555S-13 0 to 70°C S SO-8 2500/Tape & Reel -13 SA555S-13 -40to 85°C S SO-8 2500/Tape & Reel -13 NA555S-13 -40 to 105°C S SO-8 2500/Tape & Reel -13 Notes: 13. For packaging details, go to our website at https://www.diodes.com/design/support/packaging/diodes -packaging/. Marking Information SO-8 Package Packing S : SO-8 : 13 : Tape & Reel XXXXX X - X Device NE555 SA555 NA555 Package Packing S : SO-8 : 13 : Tape & Reel XXXXX X - X Device NE555 SA555 NA555

Document number: DS35112 Rev. 5 - 2 13 of 14 www.diodes.com February 2021 © Diodes Incorporated NE555 Package Outline Dimensions (All Dimensions in mm) Please see http://www.diodes.com/package-outlines.html for the latest version. SO-8 b e E A 9° ( All sides) 4°±3° c Q h 45° R 0.1 D L Seating Plane Gauge Plane SO-8 Dim Min Max Typ A 1.40 1.50 1.45 A1 0.10 0.20 0.15 b 0.30 0.50 0.40 c 0.15 0.25 0.20 D 4.85 4.95 4.90 E 5.90 6.10 6.00 E1 3.80 3.90 3.85 E0 3.85 3.95 3.90 e -- -- 1.27 h - -- 0.35 L 0.62 0.82 0.72 Q 0.60 0.70 0.65 All Dimensions in mm Suggested Pad Layout Please see http://www.diodes.com/package-outlines.html for the latest version. SO-8 C X Y Dimensions Value (in mm) C 1.27 X 0.802 X1 4.612 Y 1.505 Y1 6.50

Document number: DS35112 Rev. 5 - 2 14 of 14 www.diodes.com February 2021 © Diodes Incorporated NE555 IMPORTANT NOTICE 1. DIODES INCORPORATED AND ITS SUBSIDIARIES (“DIODES”) MAKE NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO ANY INFORMATION CONTAINED IN THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 2. The Information contained herein is for informational purpose only and is provided only to illustrate the operation of Diodes products described herein and application examples. Diodes does not as sume any liability arising out of the application or use of this document or any product described herein. This document is intended for skilled and technically trained engineering customers and users who design with Diodes products. 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