555 556 timers - signetics 1973

8/12/2019 555 556 Timers - Signetics 1973

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II r


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Copyright 1973

SIGNETICS CORPORATION

Signetics Corporation reserves the right to mike changes in the products contained in this book morder to improve design or performance and to supply the best possible product.Signetics Corporation assumes no responsibility For the me of any circuits described herein andmakes no representslions that they are free from patent infringement.


3/18

signotics TIMERLINEAR INTEGRATED CIRCUITS

555

DESCRIPTIONThe NE/SE 555 monolithic timing circuit is a highly stablecontroller capable of producing accurate time delays, oroscillation. Additional terminals are provided for triggeringor resetting if desired. In the time delay mode of operation,the lime is precisely controlled by one external resistor andcapacitor. For a stable operation as an oscillator, the freerunning frequency and the duty cycle are both accuratelycontrolled with two external resistors and one capacitor.The circuit may be triggered and reset on falling waveforms,and the output structure can source or sink up to 200mAor drive TTL circuits.FEATURES TIMING THROUGH NINE DECADES OPERATES IN BOTH ASTABLE AND MONOSTABLEMODES ADJUSTABLE DUTY CYCLE HIGH CURRENT OUTPUT CAN SOURCE OR SINK200mA OUTPUT CAN DRIVE TTL TEMPERATURE STABILITY OF 0.05% PER C NORMALLY ON AND NORMALLY OFF OUTPUTAPPLICATIONSPRECISION TIMINGPULSE GENERATIONSEQUENTIAL TIMINGTIME DELAY GENERATIONPULSE WIDTH MODULATIONPULSE POSITION MODULATIONMISSING PULSE DETECTORBLOCK DIAGRAM

PIN CONFIGURATIONS (Top View)T PACKAGE

1. Ground / , ? \ 6. Control Value*2. Trloow 1 1 6. Thrmhotd3. Output 1 i >)t. Discharge4 R., \ / B . VCC

ORDER PART NOS SE555T/NE555TV PACKAGE

Ground M~ 3 vocTrlM*r [7 t\ Dbchftrg*Output rr T] ThrholdRmiat rr TJ Control Voltia*

ORDER PART NOS. SE556V7NE655V

+T8V600 mW

ABSOLUTE MAXIMUM RATINGSSupply VoltagePower DissipationOperating Temperature Range

NE555 0C to +70CSE555 -55Cto+125C

Storage Temperature Range 65C to +1S0CLead Temperature (Soldering, 60 seconds +300C


4/18

SIGNETICS TIMER 555ELECTRICAL CHARACTERISTICS TA = 25C, Vcc = +5V to+15u nless otherwise specified

PARAMETER TEST CONDITIONS SE 555 NES55 UNITSMIN TYP MAX MIN TYP MAXSupply Voltage 45 18 4.S 16 VSupply Current Vcc'SV R L - ooVcc- 6V RL 00

Low State. Note 13

105

123

10615

ittAmATiming Error RA , - IRQ to 100KJ1

Initial AccuracyDrift with TemperatureDrift with Supply Voltage

Threshold VoltageTrigger Voltage

C - 0.1 iF Note 2see Fig. ta VCc 'SV

vcc 'SVVCC - 5V4.81.46

0.5300.062/351.67

2too0.2

5.21.9

1

501

2/351.67

%%/Volt*vccVV

Trigger Current 0.5 0.5 tjAReset Voltage 0.4 0.7 1.0 0.4 0.7 1.0 VReset Current 0.1 0.1 mAThreshold Current Note 3 0.1 25 0.1 .25 (.AControl Voltage Level VCc -15VVCC - 5V 9623 103.33 10.43.8 9.02.6 103.33 114 VVOutput Voltage Drop Howl vCc- 'sv

'SINK 10mA 0.1 0.16 0.1 .26 V'SINK ' 50mA 0.4 0.6 0.4 75 V'SINK 100mA 2.0 2.2 20 2.5 V

Output Voltage Drop Ihigh

'SINK* 200mAVoc-SV'SINK 8mA'SINK 5mA

2.5

0.J 0.25

2.5

.25 .35V

'SOURCE 200mAVcc- '5V'SOURCE - 100mAVCC- 15V 13

12.5

13.3 12 75

12.6

13.3 Vvcc- 5V 3.0 3.3 2.75 33 V

Rite Tim* of Output 100 100 ntecFell Timeot Output 100 100 ntec

MOTES1 SuppJy Currant whin output high typicHy 1mA latt2. TntK) ml Vcc - 5V and V CC - 15V3. Thu HfMl d*>i*fi-nin* ih minimum vlu of ftA + H^Fo' 1&V oearaiion, ihn m* total R - 20 mijohin,

EQUIVALENT CIRCUIT (Shown For One Side Only)

SIGNETICS TIMER 555TYPICAL CHARACTERISTICS

MINIMUM PULSE WIDTHREQUIRED FOR TRIGGERING

I

^**s

l

LQWSSTVIXT4IH LlVtL DP ll&HH*Vl*l -

LOW OUTPUT VOLTAGEw OUTPUT SINK CURRENT1

t

wc

ft * v* IV

LOW OUTPUT VOLTAGEvi OUTPUT SINK CURRENT

'1r-ml-H

I'C

n '1.c

ISL jIP* ^^

^s1h-

SUPPLY CURRENTw SUPPLY VOLTAGE

>n I

t ire

1

I

*2

>

HIGH OUTPUT VOLTAGEM OUTPUTSOURCE CURRENTini r~^~ZZZ j -p z~.


r?f

re *

It M'lrF

,c^


5/18

SIGNETICS TIMER 565TYPICAL CHARACTERISTICS (Cont'd)

DELAY TIME vtSUPPLY VOLTAGE DELAY TIME** TEMPERATURE

1910

i 1

i

ii

ii

---

| a at

s, B

--I

j*M

lU^LV VOUAGI '71

ILwtlRATUHt C

PROPAGATION DELAYM VOLTAGE LEVELOF TRIGGER PULSE

f 1 cJ * J2.1

t CMtil VEX 1 AG* L ifW rflCCfruL

signotics DUAL TIMERLINEAR INTEGRATED CIRCUITS

556

DESCRIPTIONThe NE/SE556 Dual Monolithic timing circuit is a highlyStable controller capable of producing accurate time delaysor oscillation. The 556 is a dual 555. Timing is provided byan external resistor and capacitor for each timing function.The two timers operate independently of each other sharingonly Vqc and ground. The circuits may be triggered andreset on falling waveforms. The output structures may sinkor source 1 50mA.FEATURES TIMING THROUGH NINE DECADES REPLACES TWO 555 TIMERS OPERATES IN BOTH ASTABLE, MONOSTABLE,

TIME DELAY MODES HIGH OUTPUT CURRENT ADJUSTABLE DUTY CYCLE TTL COMPATIBLE TEMPERATURE STABILITY OF 0.05% PER CAPPLICATIONSPRECISION TIMINGSEQUENTIAL TIMINGPULSE SHAPINGPULSE GENERATORMISSING PULSE DETECTORTONE BURST GENERATORPULSE WIDTH MODULATIONTIME DELAY GENERATORFREQUENCY DIVISIONINDUSTRIAL CONTROLSPULSE POSITION MODULATIONAPPLIANCE TIMINGTRAFFIC LIGHT CONTROLTOUCH TONE ENCODERBLOCK DIAGRAM

PIN CONFIGURATION (Top View)A PACKAGE

DiKhirgi |i 3 vccThrwhold IT m DiKhirga

Control Voitg* IT ~n\ Thriol0

LI Ti] Control Volog*Output Is Je\ RtHTTrigfttf |V t| OutputGround P* 7] Trioow

ABSOLUTE MAXIMUM RATINGSSupply Voltage +18VPower Dissipation 600mOperating Temperature Range NE556 0Cto+70C

SE556 -55Cto+125CSE556C -55 C to +125DC

Storage Temperature Range -65C to +150CLead Temperature (Soldering, 60 sec) +300

V


6/18

SIGNETICS DUAL TIMER 556ELECTRICAL CHARACTERISTICS TA 25 C, Vcc = +5V to + 1 5 u n less otherwise specified

PARAMETER TEST CONDITIONS SE556 ME 556 UNITSMIN TYP MAX MIN TYP MAXSupply Voltage 4.5 18 4.5 16 VSupply Current VCC -5V R L 3 5 3 6 mAVCC =15V R L = ~ 10 11 10 14 mALow State. Note 1Timing Error (Monostable) RA = 2KJ1 to fOOKn

Initial Accuracy C = O.VF Note 2 0.5 1.5 0.75 %Drift with Temperature VCC -15V 30 100 50 ppm/*CDrift with Supply

Voltage 0.05 0.2 0.1 %/VolTTiming Error (Astable) RA, R B = 2Kfito100Kn

Initial Accuracy C=0.1jiF Note 2 1.5 2.25 %Drift with Temperature VCC =15V 90 150 ppm/CDrift with Supply

Voltage 0.15 0.3 %/VoltThreshold Voltage 2/3 2/3 xvccnAhreshold Current Note 3 30 100 30 100Trigger Voltage VCC =15V 4.8 5 5.2 5 Vvcc 5V 1.45 1.67 1.9 1.67' VTrigger Current 0.5 0.5 uAReset Voltage 0.4 0.7 1.0 0.4 0.7 1.0 VReset Current 0.1 0.1 mAControl Voltage Level VCC =I5V 9.6 10 10.4 9.0 10 11 Vvcc 5V 2.9 3.33 3.B 2.6 3.33 4 VOutput Voltage Drop flow) VCC = 15V

lSINK =10mA 0.1 0.15 0.1 .25 V'sink 50nlA 0.4 0.5 0.4 .75 V'SINK = 100mA 2.0 2.25 2.0 2.75 VlSINK = 200mA 2.5 2.5vcc =5v'sink = 8mA 0.1 0.25 V'sink = 5mA .25 .35Output Voltage Drop (high)'source = 200mAVCC =15V'source = 100mA

12.5 12.5

VCC =15V 13.0 13.3 12.75 13.3 VvCc 5v 3.0 3.3 2.75 3.3 VRise Time of Output 100 100 nsecFall Time of Output 100 100 nsecDischarge Leakage Current 20 100 20 100 nAMatching Characteristics

(Note 4|Initial Timing Accuracy 0.06 0.1 0.1 0.2 %Timing Drift with

Temperature 10 10 ppm/CDrift with Supply

Voltage 0.1 0.2 0.2 0.5 %/Volt

NOTES1. Supply cumm whan output It high n typically 1.0m* ma,2. Taitad at Vcc - BV and Vcc - 1 BV.3. Thlt will datarmlna tha maximum valua of nA + R B lor 1BV operation, Tha maximum total R - 20 mao-ohmi.4. Matching characlarlttlct ralaf to tha diftarancabatwaan partormanea characteristic of aach tlmar taction

SIGNETICS DUAL TIMER 556EQUIVALENT CIRCUIT (Shown for One Side Only)

TYPICAL CHARACTERISTICSMINIMUM PULSE WIDTH

REQUIRED FOR TRIGGERING SUPPLY CURRENT SUPPLY VOLTAGE

1 miS n11

g>a&aii jgc.

m1 >rc

1/.v

\

g

IDA SI VLnlAai tlVlt CJ TKMiOIHrum


HIGH OUTPUT VOLTAGE OUTPUT

SOURCE CURRENT1

J* c

ors

w vcc - v

w


7/18

SIGNETICS DUAL TIMER 556TYPICAL CHARACTERISTICS (Cont'd)

LOW OUTPUT VOLTAGE OUTPUT SINK CURRENT LOW OUTPUT VOLTAGEvs OUTPUT SINK CURRENTJJJ.

\a -*m i

*1WC

nc um^i ^t*c

ViV, I

M>iirc

DELAY TIME nSUPPLY VOLTAGE delaY'timev TEMPERATUREi

i

1 1(H V

38

1-V

-'-

,-

....

*

turn v vol rawi* o -rt -m

IIMHflATuHF C

PROPAGATION DELAYvi VOLTAGE LEVELOF TRIGGER PULSE

M'C

^7

UK*in VOlHtjf KVfiO' T4M3GE* *VL&

SIGNETICS TIMERS 555/556APPLICATIONS INFORMATIONMONOSTABLE OPERATIONIn this mode of operation, the timer functions as a one-shot. Referring to Figure 1a the external capacitor isinitially held discharged by a transistor inside the timer.

RS1 1 o2; m SI SSf,

T nitQHTROuvOir*CE01 .FS5&(ttsf rQ

KEJ5E 5S5 J i ci-

ouimjr a ; 1 CONTROLV0L14Gf

555Upon application of a negative trigger pulse to pin 2, theflip-flop is set which releases the short circuit across theexternal capacitor and drives the output high. The voltageacross the capacitor, now, increases exponentially with thetime constant r RaC When the voltage across (he capaci-tor equals 2/3 Vcc l ^e comparator resets the flip-flopwhich in turn discharges the capacitor rapidly and drivesthe output to its low state. Figure 1b shows the actualwaveforms generated in this mode of operation.The circuit triggers on a negative going input signal whenthe level reaches 1/3 VcC- 0nce triggered, the circuit willremain in this state until the set time is elapsed, even if itis triggered again during this interval. The time that theoutput is in the high state is given by t = 1. 1 R AC and caneasily be determined by Figure 1c. Notice that since thecharge rate, and the threshold level of the comparator areboth directly proportional to supply voltage, the timing

t 0.1 MS/CMINPUT - TV/CM

I1MB

_OUTPUT VO .TAGE - SV/CM

?c JA / jL f f tCAPACITOR VOLTAGE - ZV/CM

R fl 9.1 KQ, C-.01*F, flL -1Kfi

FIGURE lb.

interval is independent of supply. Applying a negative pulsesimultaneously to the reset terminal {pin 4) and the triggerterminal (pin 2) during the timing cycle discharges the exter-nal capacitor and causes the cycle to start over again. Thetiming cycle will now commence on the positive edge of thereset pulse. During the time the reset pulse is applied, theoutput is driven to its low state.When the reset function is not in use, it is recommendedthat it be connected to Vcc ,0 avoid any possibility of falsetriggering.

ASTABLE OPERATIONIf the circuit is connected as shown in Figure 2a (pins 2 and6 connected) it will trigger itself and free run as a multivibrator. The external capacitor charges through R/^ andRg and discharges through Rg only. Thus the duty cyclemay be precisely set by the ratio of these two resistors.


8/18

SIGNETICS TIMERS 555/556APPLICATIONS INFORMATION (Cont'd)

o i o

>*,

OUTWT 4 H> 1

Ifl NtltBl

1 IJ 1

:

CONTIKM. XISfft

o f c|

' J *OUTWf

1

NE/ICUt ? *

1 2VOLTAGE OUT Vsss

In this mode of operation, the capacitor charges and dis-charges between 1 /3 Vcc and 2/3 Vcc As in the triggeredmode, the charge and discharge times, and therefore thefrequency are independent of the supply voltage.Figure 2b shows actual waveforms generated in this mode ofoperation.

1 0.5 MS/CM

w TUT VOLTAt 5V/ IIi

i

zVyVsL/\A'\CAPACITOR VOLTAGE 1WCM

FIGURE 2b.

The charge time (output high) is given by;ti = D.693(RA + flBl C

and the discharge time (output low) by:t2 = 0,693 (RB )C

Thus the total period is given by:T = t + t2 = 0.693 (Ra + 2Rb> C

The freauency of oscillation is then:1 1.44T RA +2Rb>C

and may be easily found by Figure 2c.The duty cycle is given by:

D = Ra + 2Rb

Ni V \ \ \1

10 Hi l*M, | kHr IOHjf All ftLPWfiPK* tRCQuttfC*

*Hu*f o' Cr-l'iynQ ZttHCaW *r*I t*w CiCWCHo' d>KhfDi eurwi*

TRIGGERMOOE

GET THAT PULSEUP -QUICK '

THE DEVICE TRIGGERS ON THE NEGATIVE GOING EDGE OF A LOWGOING PULSE. THE TRIGGER PULSE MUST BE OF SHORTER DURATIONTHAN THE RC TIME INTERVAL. IF THE TRIGGER IS HELD LOW.THEOUTPUT WILL STAY HIGH UNTIL TRIGGER IS DRIVEN HIGH AGAIN.

MAXIMUM OSCILLATION FREQUENCY

THE 565 TIMER IS CAPABLE OF OSCILLATING AT UPTO 300 KHi. HOWEVER. FOR TEMPERATURE STABILITY THE LIMIT SHOULD 8E AROUND 200 KHi.


9/18

RESET VOLTAGE

GUARANTEED I

THE RESET ACTS AS AN INHIBIT WHEN THE RESET (PIN 41IS ABOVE 1 VOLT THE DEVICE IS FREE TO FUNCTION. IFTHE HESET IS TAKENBELOW .4 VOLTS. THE OOTPUT ISFORCED LOW. WHEN THE RESET IS RELEASED. THE OUTPUT WILL STILL HEMAIN LOW UNTIL A TRIGGER PULSEIS APPLIED.

INITIAL ACCURACY

THE INITIAL ACCURACY IS THE TIMING REPEATABILITY FROMDEVICE TO DEVICE AND ALSO THE SAME DEVICE TODAY. TO-MORROW AND 3 YEARS FROM NOW. WITH THE SAME RC NET-WORK AND SUPPLY VOLTAGE. TYPICALLY. THE NE&55 HAS A1% INITIAL ACCURACY

THRESHOLD VOLTAGE

WHEN TRIGGERED. THE TIMER STARTS ITS TIMING CYCLE BY DRIVINGTHE OUTPUT. PIN 3. HIGH. SIMULTANEOUSLY, THE TIMING CAPACITORSTARTS CHARGING FROM ITS STEADY -STATE LEVEL AT GROUND. WHENIT REACHES 2/3 VCC . AN INTERNAL COMPARATOR IS TRIPPED.CAUSINGTHE CAPACITOR TO DISCHARGE TO GROUND THIS DRIVES THE OUTPUTLOW. ENDING THE TIMING CYCLE

TRIGGER VOLTAGE

THE TRIGGER PULSE MUST DROP BELOW 1/3 OF THESUPPLY VOLTAGE BEFORE THE TIMER TRIGGERS.


10/18

TIMING DRIFT w SUPPLY VOLTAGE

THE TIMING OF THE DEVICE WILL VARY SLIGHTLY WITH CHANGE INSUPPLY VOLTAGE. THE TYPICAL TIMING DRIFT IS 0.1%PER VOLT.

TIMING DRIFT W/ TEMPERATURE

N^

THE TIMER IN THE MONOSTABLE MODE HAS A TIMING DRIFT OFSO PPM/'C TYPICAL. IN THE ASTABLE MODE. SINCE BOTH COMPARATORS OFTHE DEVICE ARE USED. THE DRIFT IS SOMEWHATGREATER. TYPICALLY IMPPMrC DRIFT

THE DUTY CYCLE IS ON TIME EXPRESS IN TERMS OF TOTAL CYCLETIME. THE DUTY CYCLE IS LIMITED, UNDER NORMAL CIRCUMSTANCES.TO 50%. HOWEVER. BY ADDING A DIODE A DUTY CYCLE OF LESS THAN50% CAN BE ACHIEVED.

LATCH UP WHEN DRIVING AN INDUCTIVE LOAD

WELL. I'LL BE

A NEGATIVE VOLTAGE AT PIN 3 CAN CAUSE A LATCH UP. THESOLUTION IS TO ADDTWO DIODES AS SHOWN. THIS CIRCUITPROHIBITSA NEGATIVE VOLTAGE FROM REACHING PIN 3.


11/18

CONTROL VOLTAGE

PIN 5, THE CONTROL VOLTAGE PIN. IS PRIMARILY USED FOR FILTERINGWHEN DEVICE IS USED IN NOISY ENVIRONS. HOWEVER. BY IMPOSING AVOLTAGE AT THIS POINT. IT IS POSSIBLE TO VARY THE TIMING OF THEDEVICE INDEPENDENTLY OF THE RC NETWORK. THi CONTROLVOLTAGE MAY BE VARIED FROM 45* TO 90* OF Vqc IN THE MONOSTABLE MODE. AND FROM 1.7 VOLTS TO Vcc IN THE ASTABLE MODE.

MONOSTABLE TIMING

Ra

5567

e

TIOUTPUT HIGH U fiAC

ASTABLE TIMING

:He

M (OUTPUT HIGH) 0.893 (RA * KBK'7IOUTPUT LOW) 0693 (nBlcT l, 12 (TOTAL PERIOD)

1 1.44'T Zl^JZlZJZl^yz^^-jCAPACITOR VOLTAGE SWCMRA - 1 KU. C 09*F

FIGURE 3b.

FREQUENCY DIVIDERIf the input frequency is known, the timer can easily beused as a frequency divider by adjusting the length of thetiming cycle. Figure 4 shows the waveforms of the timerin Figure la when used as a divide by three circuit. Thisapplication makes use of the fact that this circuit cannotbe retriggered during the timing cycle.

1__ __

J

OUTPUT VOLTAGE SWCM

ijAPACJTORvC^TAgF v, (.--vi-oiMSflM

RA 1ZS0U. C - .02 B F rl 1 K1I

FIGURE 4.

PULSE WIDTH MODULATION (PWM)In this application, the timer is connecied m the mono-stable mode as shown in Figure 5a. The circuit is triggeredwith a continuous pulse train and the threshold voltage is

Vcc 14 To 18V \

| *

OUTPUTMSI 1M * - C

CLOCKiNrXJl ,

MODULATION

i

FIGURES*.


12/18

SIGNETICS TIMERS 555/556APPLICATIONS INFORMATION (Cont'd)modulated by the signal applied to the control voltageterminal (pin 5). This has the effect of modulating thepulse width as the control voltage varies. Figure 5b showsthe actual waveforms generated with this circuit.

1 OlSUS/CMWODULATION INPUT - 2WCM

CLOt K INPIJT 5V/CM

-out UT y< - -LTAGI . i- BVA J.crKfiJ^+AIJu .t/JJLA -Ar-rl./_/L r*-OUTPUT VOLTAGE SV/CM

FIGURE 6b,

. VCC -SnlIV

rOUTPUT < I

01.rT s t1 I

i:

i

1 1j i+ 4

MODULATIONIWUT

FIGURE 6*.

1 0.1 MS/CMMODULATION INPUT ZV7CM

QUTI>UT VOLTAGE 5V/CM

... .... ... 4tt'/ 7/ '/// iii'ffhin,ffi I * * t ll%0w ' Hiii}CAPACITOR VOLTAGE 7V/CM

RA - 3KU. RB -5O01i. C .01 (iF. Rt - 1K .>FIGURE 6b.

PULSE POSt Tl ON MODULATION (PPM)This application uses the timer connected for astable (free-running) operation, Figure 6a. with a modulating signalagain applied to the control voltage terminal. Now the pulseposition varies with the modulating signal, since the thres-hold voltage and hence the time delay is varied. Figure fibshows the waveforms generated for triangle wave modula-tion signal.

TEST SEQUENCERFigure 7 shows several timers connected sequentially. Thefirst timer is started by momentarily connecting pin 2 toground, and runs for 10 msec. At the end of its timingcycle, it triggers the second circuit which runs lor 50 msec.After this time, the third circuit is triggered. Note that thetiming resistors and capacitors can be programmed digitallyand that each circuit could easily trigger several other timersto start concurrent sequences.

V^L} St ( MA 1

1 I

SIGNETICS TIMERS 555/556APPLICATIONS INFORMATIONEach half of the 556 behaves tike a separate 555 timer andas such all of the applications indicated in the Data Sheetfor the 555 also are applicable to Che 556.LONG TIME DELAYSIn the 556 timer the timing is a function of the chargingrate of the external capacitor. For long time delays ex-pensive capacitors with extremely low leakage are required.The practicality of the components involved limits thetime between pulses to something in the neighborhood often minutes.

To achieve longer time periods both halves may be con-nected in tandem with a Divide-by network in betweenthe first timer section operates in an oscillatory mode witha period of 1/fg.

This signal is then applied to a Divide-by -N network togive an output with the period of N/fg. This can then beused to trigger the second half of the 556, The total timedelay is now a function of N and iq.

I M I I 1] 4 Id II 13KMIfe.l

MrI L

OUTPUT PUtlt WIDTH T * 1 1CTOTAL PERKW * >HA I Jfljl CIEXAMHE VALUESUT FOR tfPfWX. lft MN.t

TONE BURST GENERATORThe 556 Dual Timer makes an excellent Tone Burst Genera-tor. The first half is connected as a one shot and the secondhalf as an oscillator.

necting the output of the first half to the input of thesecond half via a OOlufd coupling capacitor sequentialtiming may be obtained. Delay ti is determined by thefirst half and tg by the second half delay.

TOME BURST GENEHATOfl

ihfurc-lH- ~i?

30K > I OK11

J

1 ttSEQUENTIAL timing

The pulse established by the one shot turns on theoscillator allowing a burst of pulses to be generated.

SEQUENTIAL TIMINGOne feature of the Dual Timer is that by utilizing bothhalves it is possible to obtain sequential timing. By con-

The first half of the timer is started by momentarily con-necting pin 6 to ground. When it is timed out (determinedby I.IR1C1) the second half begins. Its time duration isdetermined by I.IR2C2).


13/18

SIGNETICS TIMERS 555/556APPLICATIONS

SIMPLE TIME DELAY

j. BiStTLAV f ^n r a 1

J

SIMPLE TIME DELAY

j- BESIT

J

SIGNETICS TIMERS 555/566APPLICATIONS (Cont'd)

DUAL ASTABLE

DMtHft'W7*1 CrT

_;. '.; -^-I

THIS CIRCUIT HAS SUPERIOR TIMING ACCURACY TO CONVENTIONALTTL MONOSTABLES.THE .7(K.RESISTOR MAY BE REPLACED BY ADIODE. HAVING THE CATHODE TO THE GATE.

rSIGNETICS TIMERS 555/566

APPLICATIONS [Cont'd)PHOTOGRAPHIC TIMER

THE SMALL INDUCTOR IN THE LOAD IS TO REDUCE VOLTAGE SPIKES ATSWITCH-ON. IT MAY BE OMITTED IF MAINS SPIKES CAN BE TOLERATED.TO REDUCE RADIATED NOISE FURTHER.THE TRIAC MAY BE DRIVENFROM A GATED ZERO-CROSSING SWITCH.

LINEAR PULSE WIDTH MODULATOR

O ii > T'nu s mb ; I'M

L ^1 6hfVT) Q

OUT*UT 43 y _y

SE5MTCLOCK 5&NAk

|ft


15/18

StGNETlCS TIMERS 555/556APPLICATIONS (Cont'd)

SPEED WARNING DEVICE

D ib6- -6VL Z 556

ri

' b>,' ;*-

t_ 13 * - 559 9

THE INPUT PULSE TRAIN IS DERIVED FROM A TRANSDUCER SENSINGTHE VEHICLE PROPELLOR SHAFT. THE OUTPUT OF THE SECOND TIMERGOES LOW WHEN A PRESET SPEED IS EXCEEDED.

OPERATING WAVEFORMS

nut

V

riNifti - Awrrrrm^PlNfiIHI _ U li.ll

tv

Willi 11 x->-pT 77>OUT

FIN I

1 1 ii

i

i i 1

i i

SIGNET1CS TIMERS 555/556

REMOTE CONTROLLED DC SWITCHING REGULATOR

Mf

t

-[

\4VPCPS- I^ r^-r^ h k1 I

HLGViAUO

>>u ..

1

^SiuH rig MQVDC Wm N(54*

f*3

r 1

tfrnUTHW-AniLSIftiDlniftiCULAlO*TO * C1D 0*OlTAL PULtilVTOSMnrCi'fhdtfCTKWOr HIWtAIIPIIQf'QflTIONAL10ERM0*iifuuL jkajunwrcAiiHftfiion^ojtitioHt^

i

AUTOMATIC TURN OFF FOR TV SET


16/18

SIGNETICS TIMERS 555/556APPLICATIONS {Cont'd)

WASHER TIMER

rtNEWS 1

T

AUTO BURGLAR ALARM

TChJU

11 VX 111 NCtU

WHMOJ V*-

O to O

lttMEHl

^}

SIGNETICS TIMERS a 555/556APPLICATIONS (Cont'd)

SWITCHING STEP-DOWN REGULATOR

h* CLOCK + PW MODULATOfl-* 1

- AVERAGER *-

SCHEMATIC DIAGRAM OF DELAYED LIGHT TURN OFF

Ot$lAEO '( CONSTANTDMfMHiNLOf VALUES


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INTERNATIONAL SALESEUROPEAN HEADQUARTERS& U.K. SALES OFFICESignetics International Corp.,Yeoman House, 63 Croydon Rd.,Penge, London, S.E. 20, EnglandPhone: (01) 659-211] TELEX: 946619FRANCE:Signetics S.A.R.L., 36 Rue de Silly, F921Q0 BoulognePhone: 604-23-07 TELEX: 26801WEST GERMANY:Signetics GmbH, Dan test r 29, D 8 MQnchen 19Phone: (089)1 52029 TELEX: 6215191Signetics GmbH, Emsthaidenstrassa 17, D 7 Stuttgart80 Phone: (0711) 73-5CU61 TELEX: 7255798Signetics GmbH, Eulenkrugsu 81 E, D2 Hamburg 67Phone: (040) 60-35-242 TELEX: 2174490UNITED KINGDOM:Signetics International Corp., Yeoman House,63 Croydon Road, Penge, London S.E.20, EnglandPhone: (01)659-2111 TELEX: 946619STOCKING DISTRIBUTORSBELGIUMKlaasing Benelux S.A., Jan van Rijswijcklaan 278,2020 AntwerpenPhone: 03-38.27.07 TELEX: 32969WEST GERMANY:EBV Elektromk GmbH, Gabriel-Max-Strasse 72,8 Munchen 90Phone: (089) 64-40-55/68 TELEX: 524536EBV Elaktronik GmbH. Myliusstrasse 54, D 6Frankfurt/Main 1Phone: (061 1 ) 72-04-16/8 TELEX: 413590EBV Elektronik GmbH, Oststrasse 129,4 DOsseldorfPhone: (020) 8-48-46/7 TELEX: 8587267Mirotronic International Electronic GmbH,2 Hamburg 54, Ahornallee 5Phone: (040) 560-40-64 TELEX: 02 15427Mutton Muller & Co. KG, Postfach 164,Bornstrasse 22, D28 Bremen 1Phone: (0421)31-04-85 TELEX: 245-325Omni Ray GmbH, 67 Ludwigshafen, Moltkestrasse 8Postfach 211023Phone: (0621) 51.30.56/56 TELEX: 0464557Distron, 1 Berlin-33,Mecklenburgische Strasse 24 8Phone: (030)82.33.064 TELEX: 185478AUSTRIAIng, Ernst Steiner, A-1 130 Vienna Geylingg-16Phone: 8264615SWITZERLANDOmni Ray AG, Oufourstrasse 56, 8008 ZurichPhone: 01/478200 TELEX: 53239FRANCERTF, 73 Avenue Charles de Gaulle, 92200 NeuillySur SeinePhone: 722-70-40 TELEX: 65933REA Distribution, 67 Rue Henry Litolff, 92270 BoisColombesPhone: 242-53-97Elic 38, 8 Avenue du Grand Sablon, 38-La TranchePhone: (76)87.67.71 TELEX: 32739ISRAELRAPAC Electronics Ltd., 1 5 Carl Herbst Street,Tel Baruch, Tel AvivPhone; 777115.6,7 TELEX: TV 528ITALYMatroelettronica S.A.S., Viale Cirane 18, 20135 Mi la noPhone: 546-26-41 TELEX: 33168

Printed in England

signeticsthe IC professionals

SPAINAtajo Ingenieros S.A., Madrid 16,Enrique Larreta 10y12Phone: 215 3543 and 733 05 62 TELEX: 27249UNITED KINGDOMQuarndon Electronics Ltd., Slack Lane, Derby.Derbyshire.Phone: Derby 32651 TELEX: 37163SOS-WEL (Components) Ltd., Hilsea Industrial Estate,Portsmouth, HampshirePhona: Portsmouth 6531 1 TELEX: 86114Ssmicomps Ltd., 5 North field Industrial Estate,Beresford Avenue, Wembley, MiddlesexPhone: (01)903-3161 TELEX: 935243A.M. Lock & Co. Ltd., Neville Street, Mlddleton Road,Oldham, LancashirePhone: (061) 652-0431/5 London (01) 263-7521SCOTLANDSemicomps Northern Ltd. 42 The Square, Kelso,RoxburghshirePhone: Kelso 2366 TELEX: 72692SWEDEN, FINLANDA.B. Kuno Kidman, Fofkungagatan 16-18,411 02 GothenburgPhone: 010.46.031.80,30.20 TELEX: 21072A.8. Kuno Kailman, Sibyllegarten 28,11443, StockholmPhone: 08/671 71 1-671595 TELEX: 17165OY Kuno Kallman A.B., Nuljamiestentie 5C,004 00 Helsinki 40, FinlandPhone: 575231, 575362NORWAYA.S.KJell Bafcke, Kjellerat 11, Lillestrem 2000Phone: 71-18-72 and 71-53-30 TELEX: 19407 Batek NDENMARKE. Friis-Mikkelsan A/S, KragshoiveJ 51, DK^2880BagsvaerdPhone: (01)98633 TELEX: 22350THE NETHERLANDSMulder-Hardenberg, Westerho utpark 1 A, P.O. Box 3059,HaarlemPhone: (023) 3191 84 TELEX: 41431SOUTH AFRICAAllied Electric (Pty.) Ltd., P.O. Box 6090, Dunswart,Transvaal, South AfricaPhone: Johannesburg 52-4341

REPRESENTATIVESSWEDEN, FINLANDA.B. Kuno Kallman, Folkungagatan 16-18,41 1 02 GothenburgPhone: 010.46.031.80.30.20 TELEX: 21072A.B. Kuno Kallman, Sibyllegarten 28,11443, StockholmPhone: 08/671711*71595 TELEX: 17165OY Kuno Kallman A.B., Nuijamiestentie5C,004 00 Helsinki 40, FinlandPhone: 575231,575362NORWAYA.S. KJell Bakkt, Kjellerat 11, Liliestrjlm 2000Phone: 71-18-72 and 71-53-30 TELEX: 19407 Batek NISRAELRAPAC Electronics Ltd., 15 Carl Herbst Street,Tel Baruch, Tel AvivPhone: 777115.0.7 TELEX: TV 528SWITZERLANDOmni Ray AG, Oufourstrasse 56, 8008 ZurichPhone: 01/478200 TELEX: 53239


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555 556 timers - signetics 1973

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