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TS3V556IDSTN/a1152avai3V LOW POWER DUAL CMOS TIMER


TS3V556ID ,3V LOW POWER DUAL CMOS TIMERELECTRICAL CHARACTERISTICSoV = +3V , T = +25 C , Reset to V (unless otherwise specified)CC amb CCST ..
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TS3V556ID
3V LOW POWER DUAL CMOS TIMER
TS3V556 DEDICATED TO 3.3V ORBATTERYSUPPLY(Specified at 3V and 5V). VERY LOW POWER CONSUMPTION : A/tim at VCC = 3V. WIDE SINGLE SUPPLY RANGE :
+2.7V to +16V
. HIGH OUTPUT CURRENT CAPABILITY. SUPPLY CURRENT SPIKES REDUCED
DURING OUTPUT TRANSITIONS. HIGH INPUT IMPEDANCE :1012. PIN-TO-PIN AND FUNCTIONALLY COMPATI-
BLE WITH BIPOLAR NE556 AND CMOS
TS556. OUTPUT COMPATIBLE WITH TTL,CMOS
AND LOGIC MOS
DESCRIPTION

The TS3V556 withits low consumption (90μA/tim VCC= 3V)isa dual CMOS timer dedicatedto
3.3Vor batterysupply (specifiedat3Vand5V offer-
ing alsoa high frequency (f(max) 2MHzat VCC =3V
and 2.7 MHzat VCC= 5V). Thus, eitherin mono-
stableor astable mode, timing remains very accu-
rate.
Timing capacitors can also be minimized dueto
high input impedance (1012 Ω).
ORDER CODES
LOW POWER DUAL TIMERS
PIN CONNECTIONS (top view)
TS3V556
FUNCTION TABLE
LOW
- Level Voltage ≤ Min voltage specified
HIGH
- Level Voltage ≥ Max voltage specified - Irrelevant
ABSOLUTE MAXIMUM RATINGS
THERMAL CHARACTERISTICS
BLOCK DIAGRAM
(1/2 TS3V556)
OPERATING CONDITIONS
TS3V556
ELECTRICAL CHARACTERISTICS

VCC= +3V , Tamb= +25o C , Reset to VCC (unless otherwise specified)
STATIC
DYNAMIC
Note :
1. See Figure 2
TS3V556
ELECTRICAL CHARACTERISTICS

VCC= +5V , Tamb= +25o C , Reset to VCC (unless otherwise specified)
STATIC
DYNAMIC
Note :
1. See Figure 2
2. See Figure 4
TS3V556
APPLICATION INFORMATION

MONOSTABLE OPERATION the monostable mode,the timer functions asa
one-shot. Referringto figure2 the external capaci-
toris initially held dischargedbya transistor inside
the timer.
Figure 2
TYPICAL CHARACTERISTICS
SUPPLY VOLTAGE, V (V)
T, I
(
0 4 8 12 16
Figure 1 :
Supply Current (each timer)
versus supply voltage.
The circuit triggersona negative-going input signal
when thelevelreaches 1/3VCC.Once triggered,the
circuit remainsin this state until the set time has
elapsed,evenifitis triggered again during thisin-
terval. The durationof the output HIGH stateis
given by t = 1.1 R x C.
Notice that since the charge rate and the threshold
levelof the comparator are both directly propor-
tionalto supply voltage, the timing intervalis inde-
pendentof supply. Applyinga negative pulse
simultaneouslyto the Reset terminal (pin4or 10)
and the Trigger terminal (pin2or8) during the tim-
ing cycle discharges the external capacitor and
causes thecycleto start over. Thetiming cycle now
startson the positive edgeof the reset pulse. Dur-
ing the time the reset pulseis applied, the outputis
driven to its LOW state.
Whena negative trigger pulseis appliedto the trig-
ger terminal, the flip-flopis set, releasing the short
circuit across the external capacitor and driving the
output HIGH. The voltage across the capacitorin-
creases exponentially withthe time constantτ=Rx
When the voltage across the capacitor equals 2/3
VCC, the comparator resets the flip-flop which then
discharges the capacitor rapidly anddrives the out-
put to its LOW state.
TS3V556
Figure 4

t = 0.5 ms / div
CAPACITOR VOLTAGE = 1.0V/div R = R = 4.8 k , C = 0.1 F , R = 1.0kAB
Figure 5

ASTABLE OPERATION
When the circuit is connected as shown in
figure4,it triggers itself and free runs asa
multivibrator. The external capacitor charges
through RAand RBand discharges throughRBonly.
Thus the duty cycle maybe precisely setby the ra-
tio of these two resistors. the astable modeof operation,C charges and
discharges between 1/3 VCC and 2/3 VCC.Asinthe
triggered mode, the charge and discharge times
and therefore frequency, are independentof the
supply voltage.
Figure5 shows actual waveforms generatedin this
mode of operation.
The charge time (output HIGH) is given by :
t1 = 0.693 (RA + RB) C
and the discharge time (output LOW) by :
t2 = 0.693 (RB) C
Thus the total period T is given by : = t1 + t2 = 0.693 (RA + 2RB) C
The frequency of oscillation is then : TR R)CB +
1144A
The duty cycle is given by :D R= +2
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