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TS3V555ISTN/a64000avai3V LOW POWER SINGLE TIMERS


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TS3V555I
3V LOW POWER SINGLE TIMERS
TS3V555 LOW POWER SINGLE TIMERS
October 1997 DEDICATED TO 3.3V OR BATTERY SUPPLY
(Specifiedat 3V and 5V). VERY LOW POWER CONSUMPTION:
90μAat VCC =3V
. WIDE SINGLE SUPPLY RANGE:
+2.7Vto +16V
. HIGH OUTPUT CURRENT CAPABILITY. SUPPLY CURRENT SPIKES REDUCED
DURING OUTPUT TRANSITIONS. HIGH INPUT IMPEDANCE:1012 Ω. PIN-TO-PIN AND FUNCTIONALLY COMPAT-
IBLE WITH BIPOLAR NE555 AND CMOS
TS555. OUTPUT COMPATIBLE WITH TTL,CMOS
AND LOGIC MOS
DIP8

(Plastic Package)
SO8

(Plastic Micropackage)
DESCRIPTION

The TS3V555 withits low consumption (90μAat
VCC =3V) isa singleCMOS timerdedicatedto 3.3V battery supply (specifiedat 3V and 5V) offering
alsoa high frequency (f(max) 2MHzat VCC =3V and
2.7 MHzat VCC= 5V). Thus, eitherin monostable astablemode, timing remains very accurate.
Timing capacitors can also be minimized dueto
high input impedance (1012 Ω).
GND
Trigger
Output
Reset
ControlVoltage
Discharge
Threshold
PIN CONNECTIONS
(top view)
ORDER CODES
Part Number Temperature
Range
Package

TS3V555I -40, +125oC ll
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FUNCTION TABLE
RESET TRIGGER THRESHOLD OUTPUT

Low x x Low
High Low x High
High High High Low
High High Low Previous State
LOW
� Level Voltage ≤ Min voltage specified
HIGH
� Level Voltage ≥ Max voltage specified � Irrelevant
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit

VCC Supply Voltage +18 V Junction Temperature +150 oC
THERMAL CHARACTERISTICS
Symbol Parameter Value Unit

Toper Operating Temperature Range
TS3V555I,AI -40to +125C
Tstg Storage Temperature Range -65to +150 oC
Output
Discharge
Ground
Trigger
Control
Voltage
Threshold
Reset 4+
3V555
VCC
BLOCK DIAGRAM
OPERATING CONDITIONS
Symbol Parameter Value Unit

VCC SupplyVoltage +2.7to +16 V
TS3V555

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ELECTRICAL CHARACTERISTICS
VCC= +3V, Tamb= +25oC, Resetto VCC (unless otherwise specified)
STATIC
Symbol Parameter TS3V555I Unit
Min. Typ. Max.

ICC Supply Current- (no load, High and Low States)
Tamb= +25oC
Tmin.≤ Tamb ≤ Tmax. 230
VCL Control Voltage
Tamb= +25oC
Tmin.≤ Tamb ≤ Tmax.
1.7 2.2
VDIS Discharge Saturation Voltage (IDIS= 1mA)
Tamb= +25oC
Tmin.≤ Tamb ≤ Tmax.
VOL Low Level Output Voltage (ISINK= 1mA)
Tamb= +25oC
Tmin.≤ Tamb ≤ Tmax.
0.1 0.3
VOH High Level Output Voltage(ISOURCE= -0.3mA)
Tamb= +25oC
Tmin.≤ Tamb ≤ Tmax.
VTRIG Trigger Voltage
Tamb= +25oC
Tmin.≤ Tamb ≤ Tmax.
0.8 1.1
ITRIG Trigger Current 10 pA
ITH Threshold Current 10 pA
VRESET Reset Voltage
Tamb= +25°C
Tmin.≤ Tamb ≤ Tmax.
1.1 1.5
IRESET Reset Current 10 pA
IDIS Discharge Pin Leakage Current 1 100 nA
DYNAMIC
Symbol Parameter TS3V555I Unit
Min. Typ. Max.

TimingAccuracy (Monostable)= 10kΩ,C= 0.1μF- (note1) 1
Timing Shift with supply voltage variations (Monostable)= 10kΩ,C= 0.1μF, VCC= +3V +/-0.3V- (note1) 0.5
%/V
TimingShift with temperature- (note1)
Tmin. ≤ Tamb ≤ Tmax. 75
ppm/°C
fmax Maximum astable frequency- (note2)= 470Ω ,RB= 200Ω,C= 200pF 2
MHz
Astable frequency accuracy- (note2) =RB =1kΩto 100kΩ,C= 0.1μF 5
TimingShift with supply voltage variations (Astable mode)- (note2) =RB= 10kΩ,C= 0.1μF, VCC=+3 to+5V 0.5
%/V Output Rise Time (CLOAD= 10pF) 25 ns Output Fall Time (CLOAD= 10pF) 20 ns
tPD Trigger Propagation Delay 100 ns
tRPW Minimum Reset Pulse Width (VTRIG= +3V) 350 ns
Note:
1. See Figure2 See Figure4
TS3V555

3/8
ELECTRICAL CHARACTERISTICS
VCC= +5V, Tamb= +25oC, Resetto VCC (unless otherwise specified)
STATIC
Symbol Parameter TS3V555I Unit
Min. Typ. Max.

ICC Supply Current- (no load, High and Low States)
Tamb= +25°C
Tmin. ≤ Tamb ≤ Tmax.
110 250
VCL Control Voltage
Tamb= +25°C
Tmin. ≤ Tamb ≤ Tmax.
3.3 3.8
VDIS Discharge Saturation Voltage (IDIS= 10mA)
Tamb= +25°C
Tmin. ≤ Tamb ≤ Tmax.
0.2 0.3
VOL Low Level Output Voltage (ISINK= 8mA)
Tamb= +25°C
Tmin. ≤ Tamb ≤ Tmax.
0.3 0.6
VOH High Level Output Voltage(ISOURCE= -2mA)
Tamb= +25°C
Tmin. ≤ Tamb ≤ Tmax.
VTRIG Trigger Voltage
Tamb= +25°C
Tmin. ≤ Tamb ≤ Tmax.
1.67 1.96
ITRIG Trigger Current 10 pA
ITH Threshold Current 10 pA
VRESET Reset Voltage
Tamb= +25°C
Tmin. ≤ Tamb ≤ Tmax.
1.1 1.5
IRESET Reset Current 10 pA
IDIS Discharge Pin Leakage Current 1 100 nA
DYNAMIC
Symbol Parameter TS3V555I Unit
Min. Typ. Max.

TimingAccuracy (Monostable)- (note1)= 10kΩ,C= 0.1μF- (note1) 2
Timing Shift with supply voltage variations (Monostable)- (note1)= 10kΩ,C= 0.1μF, VCC= +5V +/-1V 0.38
%/V
Timing Shift with temperature- (note1)
Tmin .≤ Tamb ≤ Tmax. 75
ppm/°C
fmax Maximum astable frequency- (note2)= 470Ω ,RB= 200Ω,C= 200pF 2.7
MHz
Astable frequency accuracy- (note2) =RB =1kΩto 100kΩ,C= 0.1μF 3
TimingShift with supply voltage variations (Astable mode)- (note2) =RB= 10kΩ,C= 0.1μF, VCC= +5V to+12V 0.1
%/V Output Rise Time (CLOAD= 10pF) 25 ns Output Fall Time (CLOAD= 10pF) 20 ns
tPD Trigger Propagation Delay 100 ns
tRPW Minimum Reset Pulse Width (VTRIG= +5V) 350 ns
Note:
1. See Figure2 See Figure4
TS3V555

4/8
APPLICATION INFORMATION
MONOSTABLE OPERATION the monostable mode,the timer functionsasa
one-shot. Referringto figure2 the external capaci-
toris initially held dischargedbya transistor inside
the timer.
VCC
Reset
Trigger
Out 3
ControlVoltage
0.01Fμ
TS3V555
Figure2

CAPACITOR VOLTAGE= 2.0V/divΩ μ0.1ms /div
INPUT= 2.0V/div
OUTPUT VOLTAGE= 5.0V/div =9.1k,C= 0.01F,R= 1.0kL
Figure3
TYPICAL CHARACTERISTICS
SUPPLYVOLTAGE,V (V)
SUPPLY
CURRENT,
100 8 12 16
Figure1:
Supply Current (each timer)
versus supply voltage.
Thecircuit triggers ona negative-goinginput signal
when thelevelreaches1/3 VCC. Oncetriggered,the
circuit remainsin this state until the set time has
elapsed,evenifitis triggered again during this
interval. The durationof the output HIGH stateis
givenbyt= 1.1RxC.
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 theResetterminal(pin4) and the
Trigger terminal (pin2) during the timing cycle
discharges the external capacitor and causes the
cycleto start over. The timing cycle now startson
the positiveedgeof thereset pulse. During thetime
the reset pulseis applied, the outputis driventoits
LOW state.
Whena negative trigger pulseis appliedto pin2,
the flip-flopis set, releasing the short circuit across
the external capacitor and driving the outputHIGH.
The voltage across the capacitor increases expo-
nentially with the time constantτ =RxC.
When the voltage across the capacitor equals 2/3
VCC, thecomparator resets the flip-flop which then
discharges the capacitor rapidly and drives the
outputtoits LOW state.
Figure3 shows the actual waveforms generatedin
this modeof operation.
When Resetis not used,it shouldbe tied highto
avoid any possibleor false triggering.
TS3V555

5/8
VCC
Reset
Out 3 82
Control
Voltage
0.01Fμ
TS3V555
Figure4
Ω μ=0.5 ms/div
OUTPUT VOLTAGE =5.0V/div
CAPACITOR VOLTAGE= 1.0V/divR=R=4.8k,C =0.1F,R= 1.0kAB
Figure5

ASTABLE OPERATION
When the circuitis connectedas shownin figure4
(pin2 and6 connected)it triggers itself and free
runs asa multivibrator. The external capacitor
charges through RA and RB and discharges
through RB only. Thus the duty cycle maybe pre-
cisely setby the ratioof these two resistors. the astable modeof operation,C charges and
dischargesbetween 1/3 VCC and 2/3 VCC.As inthe
triggered mode, the charge and discharge times
and therefore frequency, are independentof the
supply voltage.
Figure5 shows actual waveforms generatedin this
modeof operation.
The charge time (output HIGH)is givenby:= 0.693 (RA+RB)C
and the discharge time (output LOW)by:= 0.693 (RB)C
Thus the total periodTis givenby:=t1+t2= 0.693 (RA +2RB)C
The frequencyof oscillationis then:=1= 1.44
(RA+ 2RB)C
The duty cycleis givenby:D= RB+ 2RB
TS3V555

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