TS3V555
3V LOW POWER SINGLE TIMERS
October 1997
.DEDICATED TO 3.3V OR BATTERY SUPPLY
(Specified at 3V and 5V)
.VERYLOWPOWERCONSUMPTION :
90µAatV
CC
=3V
.WIDESINGLESUPPLY RANGE :
+2.7V to +16V
.HIGHOUTPUTCURRENT CAPABILITY
.SUPPL Y CURRENT SPIKE S REDUCED
DURING OUTPUT TRANSITIONS
.HIGHINPUTIMPEDANCE : 10
12
Ω
.PIN-TO-PIN AND FUNCTIONALLY COMPAT-
IBLE WITH BIPOLAR NE555 AND CMOS
TS555
.OUTPUT COMPATIBLE WITH TTL,CMOS
ANDLOGIC MOS
N
DIP8
(Plastic Package)
D
SO8
(Plastic Micropackage)
DESCRIPTION
The TS3V555 with its low consumption (90µAat
V
CC
=3V) isasingleCMOStimerdedicatedto3.3V
or battery supply (specifiedat 3V and 5V) offering
also a highfrequency(f
(max)
2MHzatVCC=3Vand
2.7 MHz at V
CC
= 5V). Thus, either in monostable
or astablemode, timingremainsvery accurate.
Timing capacitors can also be minimized due to
high input impedance(10
12
Ω).
1
2
3
4
8
7
6
5
GND
Trigger
Output
Reset
CC
Control
Voltage
V
Discharge
Threshold
PINCONNECTIONS (top view)
ORDER CODES
Part Number
Temperature
Range
Package
ND
TS3V555I -40, +125
o
C ●●
1/8
FUNCTIONTABLE
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 ≥ Maxvoltage specified
X
↔ Irrelevant
ABSOLUTEMAXIMUM RATINGS
Symbol Parameter Value Unit
V
CC
SupplyVoltage +18 V
T
J
JunctionTemperature +150
o
C
THERMALCHARACTERISTICS
Symbol Parameter Value Unit
T
oper
Operating Temperature Range
TS3V555I,AI -40 to +125
o
C
T
stg
Storage Temperature Range -65 to +150
o
C
Output
Discharge
Ground
Trigger
Control
Voltage
Threshold
Reset
1
6
5
2
8
4
R
R
R
B
A
R1
R
S
Q
+
-
+
-
7
3
3V555
V
CC
BLOCK DIAGRAM
OPERATINGCONDITIONS
Symbol Parameter Value Unit
V
CC
SupplyVoltage +2.7 to +16 V
TS3V555
2/8
ELECTRICAL CHARACTERISTICS
V
CC
=+3V, T
amb
= +25oC , Reset to VCC(unlessotherwisespecified)
STATIC
Symbol Parameter
TS3V555I
Unit
Min. Typ. Max.
I
CC
Supply Current - (no load, High and Low States)
T
amb
= +25oC
T
min.
≤ T
amb
≤T
max
.
90 230
230
µA
V
CL
Control Voltage
T
amb
= +25oC
T
min.
≤ T
amb
≤T
max
.
1.8
1.7
2 2.2
2.3
V
V
DIS
Discharge Saturation Voltage(I
DIS
= 1mA)
T
amb
= +25oC
T
min.
≤ T
amb
≤T
max
.
0.05
-
0.2
0.25
V
V
OL
Low Level Output Voltage (I
SINK
= 1mA)
T
amb
= +25oC
T
min.
≤ T
amb
≤T
max
.
0.1 0.3
0.35
V
V
OH
High Level Output Voltage(I
SOURCE
= -0.3mA)
T
amb
= +25oC
T
min.
≤ T
amb
≤T
max
.
2.5
2.5
2.9
V
V
TRIG
Trigger Voltage
T
amb
= +25oC
T
min.
≤ T
amb
≤T
max
.
0.9
0.8
1 1.1
1.2
V
I
TRIG
Trigger Current 10 pA
I
TH
Threshold Current 10 pA
V
RESET
Reset Voltage
T
amb
= +25°C
T
min
. ≤ T
amb
≤T
max.
0.4
0.3
1.1 1.5
2.0
V
I
RESET
Reset Current 10 pA
I
DIS
Discharge Pin Leakage Current 1 100 nA
DYNAMIC
Symbol Parameter
TS3V555I
Unit
Min. Typ. Max.
TimingAccuracy (Monostable)
R = 10kΩ , C = 0.1µF - (note 1) 1
%
Timing Shift with supply voltage variations (Monostable)
R = 10kΩ , C = 0.1µF, V
CC
= +3V +/-0.3V - (note 1) 0.5
%/V
Timing Shift with temperature - (note 1)
T
min
.
≤T
amb
≤T
max
.
75
ppm/°C
fmax Maximum astable frequency - (note 2)
R
A
= 470Ω ,RB= 200Ω,C = 200pF
2
MHz
Astable frequency accuracy - (note 2)
R
A=RB
=1kΩto 100kΩ,C=0.1µF
5
%
Timing Shift with supply voltage variations (Astable mode) - (note 2)
R
A=RB
= 10kΩ, C = 0.1µF, VCC= +3 to+5V
0.5
%/V
t
r
Output Rise Time (C
LOAD
= 10pF) 25 ns
t
f
Output Fall Time (C
LOAD
= 10pF) 20 ns
t
PD
TriggerPropagation Delay 100 ns
t
RPW
Minimum Reset Pulse Width (V
TRIG
= +3V) 350 ns
Note : 1. SeeFigure 2
2. See Figure 4
TS3V555
3/8
ELECTRICAL CHARACTERISTICS
V
CC
=+5V , T
amb
= +25oC , Reset to VCC(unlessotherwise specified)
STATIC
Symbol Parameter
TS3V555I
Unit
Min. Typ. Max.
I
CC
Supply Current - (no load, High and Low States)
T
amb
= +25°C
T
min
. ≤T
amb
≤ T
max
.
110 250
250
µA
V
CL
Control Voltage
T
amb
= +25°C
T
min
. ≤T
amb
≤ T
max
.
2.9
2.8
3.3 3.8
3.9
V
V
DIS
Discharge Saturation Voltage(I
DIS
= 10mA)
T
amb
= +25°C
T
min
. ≤T
amb
≤ T
max
.
0.2 0.3
0.35
V
V
OL
Low Level Output Voltage (I
SINK
= 8mA)
T
amb
= +25°C
T
min
. ≤T
amb
≤ T
max
.
0.3 0.6
0.8
V
V
OH
High Level Output Voltage(I
SOURCE
= -2mA)
T
amb
= +25°C
T
min
. ≤T
amb
≤ T
max
.
4.4
4.4
4.6
V
V
TRIG
Trigger Voltage
T
amb
= +25°C
T
min
. ≤T
amb
≤ T
max
.
1.36
1.26
1.67 1.96
2.06
V
I
TRIG
Trigger Current 10 pA
I
TH
Threshold Current 10 pA
V
RESET
Reset Voltage
T
amb
= +25°C
T
min
. ≤T
amb
≤ T
max
.
0.4
0.3
1.1 1.5
2.0
V
I
RESET
Reset Current 10 pA
I
DIS
Discharge Pin Leakage Current 1 100 nA
DYNAMIC
Symbol Parameter
TS3V555I
Unit
Min. Typ. Max.
TimingAccuracy (Monostable) - (note1)
R = 10kΩ , C = 0.1µF - (note 1) 2
%
TimingShift with supply voltage variations (Monostable) - (note1)
R = 10kΩ , C = 0.1µF, V
CC
= +5V +/-1V 0.38
%/V
TimingShift with temperature - (note1)
T
min
.≤T
amb
≤ T
max
.
75
ppm/°C
fmax Maximum astable frequency - (note 2)
R
A
= 470Ω ,RB= 200Ω, C = 200pF 2.7
MHz
Astable frequency accuracy - (note 2)
R
A=RB
=1kΩto 100kΩ,C =0.1µF
3
%
TimingShift with supply voltage variations (Astable mode) - (note 2)
R
A=RB
= 10kΩ,C = 0.1µF, VCC= +5V to+12V
0.1
%/V
t
r
Output Rise Time (C
LOAD
= 10pF) 25 ns
t
f
Output Fall Time (C
LOAD
= 10pF) 20 ns
t
PD
Trigger Propagation Delay 100 ns
t
RPW
Minimum Reset Pulse Width (V
TRIG
= +5V) 350 ns
Note : 1. See Figure 2
2. See Figure 4
TS3V555
4/8
APPLICATION INFORMATION
MONOSTABLEOPERATION
In the monostable mode,the timer functions as a
one-shot. Referring to figure 2 the externalcapacitor is initiallyheld dischargedby a transistor inside
the timer.
V
CC
Reset
Trigger
Out
3
2
48
7
6
5
1
R
C
Control Voltage
0.01 F
µ
TS3V555
Figure2
CAPACITOR VOLTAGE = 2.0V/div
Ω
Ω
µ
t = 0.1 ms / div
INPUT = 2.0V/div
OUTPUT VOLTAGE = 5.0V/div
R = 9.1k , C = 0.01 F , R = 1.0k
L
Figure3
TYPICAL CHARACTERISTICS
CC
SUPPLYVOLTAGE,V (V)
CC
SUPPLY CURRENT, I ( A)
µ
300
200
100
0481216
Figure 1 : Supply Current (each timer)
versussupply voltage.
Thecircuittriggersona negative-goinginput signal
whenthelevelreaches1/3V
CC
. Oncetriggered,the
circuit remains in this state until the set time has
elapsed,even if it is triggered again during this
interval. The duration of the output HIGH state is
given by t =1.1 R x C.
Noticethat since the chargerate and the threshold
level of the comparator are both directly proportional to supply voltage, the timing interval is independent of supply. Applying a negative pulse
simultaneouslyto theResetterminal(pin4)andthe
Trigger terminal (pin 2) during the timing cycle
dischargesthe external capacitor and causes the
cycle to start over. The timingcycle now starts on
thepositiveedgeoftheresetpulse.Duringthetime
the reset pulse is applied,the output is driven toits
LOW state.
When a negative trigger pulse is applied to pin 2,
the flip-flop is set,releasing the shortcircuit across
theexternalcapacitorand drivingthe outputHIGH.
The voltage across the capacitor increases exponentiallywith the time constant τ =RxC.
Whenthe voltageacross the capacitor equals 2/3
V
CC
, thecomparatorresets the flip-flopwhichthen
discharges the capacitor rapidly and drives the
output to its LOW state.
Figure3 shows the actualwaveformsgeneratedin
this mode of operation.
When Reset is not used, it should be tied high to
avoid any possible or false triggering.
TS3V555
5/8
V
CC
Reset
Out
3
4
8
7
5
1
R
C
2
6
R
A
B
Control
Voltage
0.01 F
µ
TS3V555
Figure4
ΩΩ
µ
t = 0.5 ms / div
OUTPUT VOLTAGE = 5.0V/div
CAPACITOR VOLTAGE = 1.0V/div
L
R = R = 4.8 k , C = 0.1 F , R = 1.0k
AB
Figure5
ASTABLEOPERATION
When the circuit is connected as shown in figure 4
(pin 2 and 6 connected) it triggers itself and free
runs as a multivibrator. The external capacitor
charges through R
A
and RBand discharges
through R
B
only.Thus the duty cycle may be pre-
ciselyset by the ratio of these two resistors.
In the astable mode of operation, C charges and
dischargesbetween1/3 V
CC
and2/3 VCC.Asinthe
triggered mode, the charge and discharge times
and therefore frequency, are independent of the
supplyvoltage.
Figure5 showsactual waveformsgeneratedin this
mode of operation.
The charge time (output HIGH)is given by :
t1 = 0.693 (R
A+RB
)C
and the dischargetime (output LOW) by :
t2 = 0.693 (R
B
)C
Thus the total period T is given by :
T = t1 + t2 = 0.693 (R
A
+2RB)C
The frequencyof oscillation is then :
f =
1
T
=
1.44
(R
A
+ 2RB) C
The duty cycle is given by : D =
R
B
RA+ 2R
B
TS3V555
6/8
PM-DIP8.EPS
PACKAGE MECHANICAL DATA
8 PINS- PLASTIC DIP
Dimensions
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 3.32 0.131
a1 0.51 0.020
B 1.15 1.65 0.045 0.065
b 0.356 0.55 0.014 0.022
b1 0.204 0.304 0.008 0.012
D 10.92 0.430
E 7.95 9.75 0.313 0.384
e 2.54 0.100
e3 7.62 0.300
e4 7.62 0.300
F 6.6 0260
i 5.08 0.200
L 3.18 3.81 0.125 0.150
Z 1.52 0.060
DIP8.TBL
TS3V555
7/8
Information furnishedis believed tobe accurate and reliable. However,SGS-THOMSON Microelectronics assumes no responsibility
for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patentrights of SGS-THOMSON Microelectronics.
Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all
information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life
support devices or systems without express written approval of SGS-THOMSON Microelectronics.
1997 SGS-THOMSON Microelectronics– Printed in Italy – All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia- Brazil - Canada - China- France - Germany - Italy - Japan - Korea - Malaysia - Malta - Morocco
The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
ORDERCODE :
PM-SO8.EPS
PACKAGE MECHANICAL DATA
8 PINS- PLASTIC MICROPACKAGE (SO)
Dimensions
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 1.75 0.069
a1 0.1 0.25 0.004 0.010
a2 1.65 0.065
a3 0.65 0.85 0.026 0.033
b 0.35 0.48 0.014 0.019
b1 0.19 0.25 0.007 0.010
C 0.25 0.5 0.010 0.020
c1 45
o
(typ.)
D 4.8 5.0 0.189 0.197
E 5.8 6.2 0.228 0.244
e 1.27 0.050
e3 3.81 0.150
F 3.8 4.0 0.150 0.157
L 0.4 1.27 0.016 0.050
M 0.6 0.024
S8
o
(max.)
SO8.TBL
TS3V555
8/8
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