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MC1455 MC1555 Specifications and Applications Information I 4 TIMING CIRCUIT The MC1555/MC1455 monolithic timing circuit is a highly stable controller capable of producing accurate time delays, or oscillation. Additional terminals are provided for triggering or resetting if desired. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For astable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled 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 200 mA or drive MTTL circuits. ● Direct Replacement for NE555/SE555 ● Timing ● operates ● Adjustable ● High Current Output Can Source or Sink 200 mA ● output From Microseconds Through ~,.y! ,7*2>a *Y$ ,.,.,*$~\., *tl~i;. ~.i,;.,x..$.*:. $:?, . ‘s. .>,. ‘, i\.. ‘..,, .Meiti:l’ ‘?>, ~,?,~y:.x$:+ ,,.}:+*:,, !$.!l ,t. Timers Hours in Both Astable and Monostable Modes Duty Cycle Can Drive MTTL METAL PACKAGE CASE 601-04 1. 2. 3. 4. Ground Trigger output Reset 5. 6. 7. 8. Control Voltage Threshold Discharge Vcc 8 n 5 4 1 (Top View) PI SUFFIX PLASTIC PACKAGE CASE 626-04 (MC1455P1 only) U SUFFIX CERAMIC PACKAGE CASE 693-02 F* Ik ~ V 1 D SUFFIX PLASTIC PACKAGE f.! ~>~~ CASE Vcc ORDERING 7 5 _A Flip Oischarge Device 2 s Inhibiti Reset _B 5k 7 Gn~ MTTL is a trademark J 1 of Motorola Inc. 1‘4 Reset output INFORMATION Temperature R FIOP Alternate 5k Trigger ,* * 5k Threshold Control Voltage s SO-8 ~8 ~ 751-01 MCI 455G — MC1455P1 NE555V MC1455D — Mcl 455U — MC1455BPI O“c to — MCI 555U SE555 INC., 1985 Package +70”C + 70”C Metal Can Plastic DIP O“c to + 70°c SO-8 O“c to + 70°c Ceramic DIP – 400C tO MC1555G @MOTOROLA Range O“cto + a5”c Plastic DIP – 55°C to + 125°C Metal Can – 55°C to + 125°C Ceramic OIP DS9240R3 MAXIMUM RATINGS (TA = + 2YC unless otherwise noted.) Rating Power Supply Voltage Discharge Current (Pin 7) ] Symbol] Value Unit v~~ +18 Vdc 200 mA 17 Power Dissipation (Package Umitation) Metal Can Derate above TA = + 2YC Plastic Dual In-Line Package Derate above TA = + 29C Operating Temperature Range (Ambient) MC1555 MC1455B MC1455 Storage Temperature FIGURE 3 — GENERAL TEST CIRCUIT v~~ -’cc — Vcc 5 mW mWPC mW m W/°C 680 4.6 625 5.0 0.01 WF Range 65to 6 Threshold n output ‘th l~i”~ l~o”rce 2 — == ‘c +150 = Typ — 4.5 SUPPIV Voltage Max 16 Current VCC= 5.OV, Low State, Error RL=W 12 (Note v — — 3.0 10 1.0 50 0.10 6.0 15 1) (Note 2) R=l.Ok~to100k~ Initial Accuracy Drift with Temperature 100 Drift with Suo~lv 0.20 — — — — — 2/3 5.0 1.67 — — — — 0.5 — — 1.0 0.4 0.7 1.0 — — — 0.1 — Threshold Unit mA VCC=15V,RL=~ Timing 7 Oischarge Charatieristics Supplv ,— = MC1 555 MC1455 i, 55to +125 40 to + 85 Oto +70 ELECTRICALCHARACTERISTICS (TA Control Voltage “c TA II 700 11 2.0 C = 0,1 pF Voltaae Voltage “/0 PPMl°C — — Yolvolt Xvcc v Trigger Voltage v~~=15v 5.2 1.9 IR Ith !di~ — — — 0.1 — 0.1 0.25 — 100 9.6 10 10.4 2.9 3.33 3.8 — 0.1 — — — 0.4 2.0 2.5 0.15 0.5 2.2 — — — — — — — 0.1 — 0.25 — — — PA v mA\l 0.1 — 0.25 PA 100 nA 9.0 10 11 2.6 3.33 4.0 0.1 0.25 0.75 2.5 VCL v VO L v vo H ‘(l~”~~e=200 mA) VCC=15V (l~Ource= 100mA) Vcc= 15V Vcc = 5.0 v tOLH Rise Time of OutDut Fall Time I —I tOHL of Output 0.4 2.0 2.5 — — — 0.25 0.35 v — 12.5 13 3.0 — 13.3 3.3 — 100 — — — — 100 — 12.5 13.3 3.3 12.75 2.75 100 — 100 — — — — — ns ns OTES: 1. SupplV current when output is high is tvpimllv 1.0 mA less. 2. Tested at VCC = 5.0 V and VCC = 15 V. Monostable 3. This will determine The maximum the maximum value of RA + RB for 15 V operation. total R = 20 megohms. mode MOTOROLA Semiconductor @ 2 Products Inc. .- TYPICAL CHARACTERISTICS (TA = + 2WC unless othewise FIGURE 4 — TRIGGER PULSE WIDTH FIGURE 5 — SUPPLY CURRENT 150 10 125 ~ E g 100 z + ~ 75 u m ; ~ 8.0 5 u : 6.0 2 u > d 4.0 . 3 w 50 z- noted.) S2.O 25 o 5.0 0 0 0.2 0.1 0.3 0.4 VT(min), MI NIMUM TRIGGER VOLTAGE (X VCC= Vdc) @ Vec Vcc, 10 SUPPLY VOLTAGE 15 (Vdc) = 5.0 Vdc VOLTAGE @ VCC = 15 Vdc 10 10 ~l,o 1.0 a ~ ~ i 2 z F 0.1 01 0.01 1,0 2.0 5.0 10 20 50 5.0 100 10 20 50 0.01 100 1.0 2.0 5.0 10 20 50 100 ISINK, (mA) FIGURE 10 — DELA&TIM”~{yS versus SUPPLY ~J~~QE ..,. “+!.K. :, 1.015- 1.015 0 ~ E N 1.010 i s g 300 ~ ; 250 z F $ 200 d u n ~ 150 1.010 i < 1.005 % z : + > FIGURE 12 — PROPAGATION DELAY versus TRIGGER VOLTAGE FIGURE 11 — DEMY TIME versus TEMPERATURE 1.005 0 z 1.000 ~ ; 0.995 0 > 0.990 \ - 1.000 F > 5 w 0 0.995 ~ 0.990 . \ - r < : 100 L 0 ~. 50 “. 0.985” 0.985 Vcc, SUPPLY VOLTAGE (Vdc) 0 -75 -50 -25 TA, AMBIENT MOTOROLA +25 +50 +75 +1OO +125 TEMPERATURE (OC) Semiconductor @ 3 o 0 vT(~in), 0.4 0,3 0.2 0.1 MINIMUM TRIGGER VOLTAGE (X VCC = Vdc) Products Inc. FIGURE 13 — REPRESENTATIVE -— t-–- -- ——— CIRCUIT SCHEMATIC 50 - Control Voltage .—. 1 I I I 1 . ; I I ,1 I ‘hreshold 6 I II ,1 II : - 3,9k / I — I I I I 1 L______ Trigger I II [1 10 k I I I II 1! II ‘1 I 20 : ;E; :T- – - 11 II I I lL__– — —___J — .— The MC1555 is a monolithic timing circuit which uses ~%$~ timing elements an external resistor – capacitor network, ‘~.,ca$Y be used in both the monostable (one-shot) and ast~~fi~~-s with frequency and duty cycle controlled by the G@~@it& and A reset pin is provided to discharge the capacitor thus interrupting the timing cycle. As long as the reset pin i$ low, the capacitor discharge transistor is turned “on” and prevents the capacitor from charging. While the reset voltaW is applied the digital output will remain the same. The reset pin should be tied to the supply voltage when not in usa. resistor values. While the timing is dependent u@t~~~l@~ternal passive components, the monolithic circuit pra~~$~,:%a startin9 circuit, voltage comparison and other function$t~’w~ for a comInternal to the inte~atea~ c?rcuit are two plete timing circuit. mmperators, one for the input signal an@fi$~k@$er for capacitor voltage; also a flip-flop and digital outp&t ar$ncluded. The comparator reference voltages are alwa@’’&~~h@d ratio of the supply voltage thus providing output timin,~%de@ndent ,,i.,,, $,\.\..,?>,,?”*$, , :,.,,. .:&$, ~,,. .*y.,<..$ ,:. ~ ;“ FIGURE 14 — MONOSTABLE ,*. Monostable In the Mode monostabl~ ,,:at:. ;:? \ . ..(~.$, ~d&J’~’capecitor CIRCUIT of supplv voltage. +vc~ ● and a single resistor are ● T fRL used for the timin~t#*k. Both the threshold terminal and the discharge transist:%~{~~inal are connected to~ther in this mode, refer to circuit ‘~<~~ 14. When the input voltaga to the trigger comparator ~~a?ls,wow 1/3 VCC the mmperator output triggers the flip-f/~ :~Y:@at it’s output sets low. This turns the capacitor dischar@ :~,~$lstor “off” and drives the digital output to the high statq.. ~~>’ condition allows the capacitor to charge at an expon~~~.rate which is set bv the R C time constant. When the RA 4 I Discharge I 3 7 b * output 2 I . ‘, <RL .,’ -c 6 MC1555 Mc1455 mPa&$or volta9e reaches 2/3 VCC the threshold comparator resets the flip-flop. This action discharges the timing capacitor and returns the dgitel output to the low state. Once the flip-flop has been triggered by an input signal, it cannot & retriggered until the present timing pariod has been completed. The time that the output is high is given bv the equation t = 1.1 RA C. Various combinations of R and C and their associated times are shown in Figure 16. The triggar pulse width must be less than the timing period. MOTOROLA (5 to 15 v) T <1 5 Threshold ~ = Trigger L 1 0.01 PF T Control Voltage —— Semiconductor @ 4 Products Inc. GENERAL OPERATION FIGURE 15 — MONOSTABLE (continued) WAVEFORMS FIGURE 16 — TIME DELAY t = 50 pslcrn (RA=lokQ, C= O.OltiF, RL= l.Ok~, VCC=15V) FIGURE 17 — ASTABLE CIRCUIT +vcc(5t0 15 v) I T 1 I ‘. :’RL ~, I I Vcc Reset 4 , 8 A t = 20 ps/cm (RA=5.1 k~, RB=3.gk In the astable mode the ti:~{,~~@&nnected so Ihat it will retrigger itself and cause the c~ac~@r voltage to oscillate between 1/3 VCC and 2/3 VCC. S~~ F i9&~’~7. C ‘0.01 vF, RL= Q, VCC= l.Ok~; 15 V) ..? ~;.~. The external capacitq%@J,a$@s to 2/3 VCC through RA and RB and discharges to l~$:,$~~through RB. By varying the ratio of these resistors th~,~~wtttycle can be varied. The charge and discharge time~,ar~}~,~pendent of the supply voltage. The charge t~~>~$:t~ut The discha~: high) is given bv: tl = 0.695 ti$e’(output Thus @:’’~$t$;:&riod ,*,,,.,,, . ..,.,**)3, ... . low) bv: t2 = 0.695 (RA+RB) (RB) is given bv: T = tl + t2 = 0.695 FIGURE 19 — FREE-RUNNING C C (RA+2RB) 10 C z~ u be easilv found as shown in Figure 19. RB The duty cycle is given bv: DC = — RA+2RB G : \ 0.1. 6 u \ \ \ v- To obtain the maximum dutv cvcle RA must be as small as possible; but it must also be large enough to limit the discharge current (pin 7 current) within the maximum rating of the discharge transistor (200 mA). The minimum value of RA is given bv: VCC (Vdc) VCC (Vdc) > ‘A > 17 (A) 0.2 MOTOROLA \ a + and flav m FREQUENCY 100 0.01 \ \ \ 10 \ 100 \ l.Ok (RA+2RB) 0.001 0.1 1,0 f, FREE-RUNNING Semiconductor 5 FREQUENCY Products Inc. ~ \ 10 k (Hz) 100k I APPLICATIONS INFORMATION Missing Pulse Detector Linear Voltage Ramp In the monostable mode, the resistor can be replaced The bv a con- 37 1!- \f -- then t can be made independent timer can be used to produce an output when @n input pulse fails to occur within the delay of the timer. To,~@~$~lplish this, set the time delav to be slightly longer than th:i~.~~t~e~een successive input pulses. The timing cycle is then co~;m$~w%ly reset by the input pulse train until a change in frequ~~y,~ a missing pulse allows completion of the timing cycle#~,&$~g a change in stant current source to provide a linear ramp voltage, The capacitor still charges from O to 2/3 Vcc. The linear ramp time is given by t=g ~cc i!-- ,— of Vcc. FIGURE 20 — LINEAR VOLTAGE SWEEP CIRCUIT pvcc “A 4 Discharge 7 4f Threshold 6 MC1555 MC1455 I Input T ,- Co”tro, 5 voltage 2 Trigger xc — I O.Ol&F 1 —— = 2N4403 ~or’q”iv= FIGURE 23 — MISSING (RE = 10 k~, R2 = 100 $~,~1 =:’39 k~, C = 0.01 pF,VCC t = 700 PULSE DETECTOR WAVEFORMS (RA = 2.0 kQ, RL = 1.0 k~, C = 0.1 KF, VCC = 15 V) t = 500 us/cm MOTOROLA @ = 15 V) Semiconductor 6 pslcm Products Inc. APPLICATIONS Pulse Width INFORMATION (continued) FIGURE 25 — PULSE WIDTH MODULATION Modulation WAVEFORMS (RA = 10 kQ, C = 0.02 KF, VCC = 15 V) the timer is triggered with a continuous pulse train in the monostable mode of operation, the charge time of the capacitor mn be varied by changing the control voltage at pin 5. In this manner, the output pulse width an be modulated by applying a modulating signal that controls the threshold voltage. If ,*!* FIGURE 24 +Vcc (5t0 15 v) c ● Y i ) BL RA 8( 4C 3 7 ● o Utput MC1555 6 MC7455 2 Ic = 5 ● Input ,, ,,,.>,.. ,% ● Modulation Clock Input 1 + I “i~,,W*Seq uences ‘\:\,*’?.l ,:J\:,\, ~,ix+,., ~. Several timers can be connected to drive each other for sequen\.... “ tial timing. An example is shown in Figure 26 where the sequence ~~ is started bv triggering the first timer which runs for 10 ms. The output then switches low momentarily and starts the second timer Vcc — m MOTOROLA Semiconductor 7 Products Inc. (5 to 15 v) — I , OUTLINE DIMENSIONS —. —’+ NOTE: 1.LEAOS WITHIN0.25mm (0.010) OIAOF TRUE POSITIONAT SEATINGPLANE AT M~lMUM MATERIALCONOITION. MILLIMETERS DIM A JL. MNE MIN INCHES MU 8,51 MIN Mti 9.40 0.335 0.370- B 7.75 8.51 0.305 0.335 c 4.19 4.70 0.165 0.185 D 0.41 0.48 0.016 0,019 E 0.25 1,02 0.010 0.040 F 0.25 1,02 0.010 0.040 G 5.06BSC H 0.71 0.86 0.028 0.034 J 0.74 1.14 0.029 0.045 K 12,70 – 0.500 L 3.05 4.06 0.120 M N 45” BSC 2.41 0.040 O.om 0.200BSC – 0.006 0,012 0.115 0.135 NOTES: 0.160 45”BSC 2.67 0.095 0,105 G SUFFIX CASE 601-04 METAL PACWGE (MC1455PI only) 3.PAC@E CON~R OPTIONAL[ROUNO OR Sd~CORNERS). ,&_N@S A ANO B ARE OATUMS, ‘$.Dl@SIONING ANO TOLERANCINGPER ANSI PI SUFFIX CASE 626-04 PLASTIC PACWGE $~;~,+{~$~, 1982. -. {K LAat 2.DIMENSION“Y TO CENTER OF LEAOS WHEN FORMEO PARALLEL, Motorola reserves not assume patent rights Aff!rmatlve any the right liability nor the rights Action to make ar!slng changes without out of the application of others 033-UL CERAMIC Motorola and@ notice or use of any are registered to any products product here!n or circuit trademarks to improve descr[bed of Motorola, reliability, heretn, Inc. Motorola, neither function does or design. It convey Inc. IS an Equal Motorola any license Employment does under Its Opportunity/ Emolover MOTOROLA Semiconductor @ BOX 8179-6 I +1 0.25(00101 @l A 81 PACWGE further D SUFFIX PLASTIC PACWGE CASE 751-01 SO-8 R6JA = 180°CW NOTES: 1,.T-ISSEATINGPLANE. 2,DIMENSIONA ISOATUM. 3,POSITTONALTOLERANCE FORLEAOS: PBINIED IN “SA 7-85 m.,m LIT”. .32,17 1$,000 20912. PHOENIX, 8 Products Inc. ARIZONA 85036. A SUBSIDIARY OF MOTOROLA INC. .,92,0., -.