STMICROELECTRONICS TS3V555I

TS3V555
3V LOW POWER SINGLE TIMERS
.
.
.
..
..
.
DEDICATED TO 3.3V OR BATTERY SUPPLY
(Specified at 3V and 5V)
VERY LOW POWER CONSUMPTION :
90µA 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 Ω
PIN-TO-PIN AND FUNCTIONALLY COMPATIBLE WITH BIPOLAR NE555 AND CMOS
TS555
OUTPUT COMPATIBLE WITH TTL,CMOS
AND LOGIC MOS
N
DIP8
(Plastic Package)
D
SO8
(Plastic Micropackage)
DESCRIPTION
The TS3V555 with its low consumption (90µA at
VCC = 3V) is a single CMOS timer dedicated to 3.3V
or battery supply (specified at 3V and 5V) offering
also a high frequency (f(max) 2MHz at VCC = 3V and
2.7 MHz at VCC = 5V). Thus, either in monostable
or astable mode, timing remains very accurate.
Timing capacitors can also be minimized due to
high input impedance (1012 Ω).
ORDER CODES
Part Number
TS3V555I
Temperature
Range
o
-40, +125 C
Package
N
D
●
●
PIN CONNECTIONS (top view)
October 1997
GND
1
8
VCC
Trigger
2
7
Discharge
Output
3
6
Threshold
Reset
4
5
Control
Voltage
1/8
TS3V555
BLOCK DIAGRAM
VCC
Reset
8
4
3V555
R
R1
Control
Voltage
3 Output
Q
+
Threshold 6
R
-
5
A
S
R
+
-
Trigger 2
B
R
7 Discharge
1
Ground
FUNCTION TABLE
RESET
TRIGGER
THRESHOLD
OUTPUT
Low
x
x
Low
High
Low
x
High
High
High
High
Low
High
High
Low
Previous State
↔
↔
↔
LOW
HIGH
X
Level Voltage ≤ Min voltage specified
Level Voltage ≥ Max voltage specified
Irrelevant
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Supply Voltage
VCC
Junction Temperature
TJ
Value
+18
+150
Unit
V
o
C
THERMAL CHARACTERISTICS
Symbol
Toper
Tstg
Parameter
Value
Operating Temperature Range
TS3V555I,AI
-40 to +125
Storage Temperature Range
-65 to +150
Unit
o
C
o
C
OPERATING CONDITIONS
Symbol
VCC
2/8
Parameter
Supply Voltage
Value
Unit
+2.7 to +16
V
TS3V555
ELECTRICAL CHARACTERISTICS
VCC = +3V , Tamb = +25oC , Reset to VCC (unless otherwise specified)
STATIC
Symbol
Parameter
TS3V555I
Min.
Typ.
Max.
90
230
230
2
2.2
2.3
Discharge Saturation Voltage (IDIS = 1mA)
o
Tamb = +25 C
Tmin. ≤ Tamb ≤ Tmax.
0.05
-
0.2
0.25
Low Level Output Voltage (ISINK = 1mA)
o
Tamb = +25 C
Tmin. ≤ Tamb ≤ Tmax.
0.1
0.3
0.35
Supply Current - (no load, High and Low States)
o
Tamb = +25 C
Tmin. ≤ Tamb ≤ Tmax.
ICC
VCL
Control Voltage
o
Tamb = +25 C
Tmin. ≤ Tamb ≤ Tmax.
VDIS
VOL
VOH
VTRIG
ITRIG
ITH
IRESET
IDIS
µA
V
1.8
1.7
V
V
V
High Level Output Voltage (ISOURCE = -0.3mA)
o
Tamb = +25 C
Tmin. ≤ Tamb ≤ Tmax.
2.5
2.5
2.9
Trigger Voltage
o
Tamb = +25 C
Tmin. ≤ Tamb ≤ Tmax.
0.9
0.8
1
V
1.1
1.2
Trigger Current
10
pA
Threshold Current
10
pA
Reset Voltage
Tamb = +25°C
Tmin. ≤ Tamb ≤ Tmax.
VRESET
Unit
V
0.4
0.3
1.1
Reset Current
10
Discharge Pin Leakage Current
1
1.5
2.0
pA
100
nA
DYNAMIC
Symbol
Parameter
Timing Accuracy (Monostable)
R = 10kΩ , C = 0.1µF - (note 1)
fmax
TS3V555I
Min.
Typ.
Max.
Unit
%
1
%/V
Timing Shift with supply voltage variations (Monostable)
R = 10kΩ , C = 0.1µF, V CC = +3V +/-0.3V - (note 1)
0.5
Timing Shift with temperature - (note 1)
Tmin. ≤ Tamb ≤ Tmax.
75
Maximum astable frequency - (note 2)
R A = 470Ω , RB = 200Ω, C = 200pF
2
Astable frequency accuracy - (note 2)
R A = RB = 1kΩ to 100kΩ, C = 0.1µF
5
ppm/°C
MHz
%
%/V
Timing Shift with supply voltage variations (Astable mode) - (note 2)
R A = RB = 10kΩ, C = 0.1µF, VCC = +3 to+5V
0.5
tr
Output Rise Time (CLOAD = 10pF)
25
ns
tf
Output Fall Time (CLOAD = 10pF)
20
ns
Trigger Propagation Delay
100
ns
Minimum Reset Pulse Width (VTRIG = +3V)
350
ns
tPD
tRPW
Note :
1. See Figure 2
2. See Figure 4
3/8
TS3V555
ELECTRICAL CHARACTERISTICS
VCC = +5V , Tamb = +25oC , Reset to VCC (unless otherwise specified)
STATIC
Symbol
Parameter
TS3V555I
Min.
Typ.
Max.
110
250
250
3.3
3.8
3.9
Discharge Saturation Voltage (IDIS = 10mA)
Tamb = +25°C
Tmin. ≤ Tamb ≤ Tmax.
0.2
0.3
0.35
Low Level Output Voltage (ISINK = 8mA)
Tamb = +25°C
Tmin. ≤ Tamb ≤ Tmax.
0.3
0.6
0.8
Supply Current - (no load, High and Low States)
Tamb = +25°C
Tmin. ≤ Tamb ≤ Tmax.
ICC
VCL
Control Voltage
Tamb = +25°C
Tmin. ≤ Tamb ≤ Tmax.
VDIS
VOL
VOH
VTRIG
ITRIG
ITH
IRESET
IDIS
µA
V
2.9
2.8
V
V
V
High Level Output Voltage (ISOURCE = -2mA)
Tamb = +25°C
Tmin. ≤ Tamb ≤ Tmax.
4.4
4.4
4.6
Trigger Voltage
Tamb = +25°C
Tmin. ≤ Tamb ≤ Tmax.
1.36
1.26
1.67
V
1.96
2.06
Trigger Current
10
pA
Threshold Current
10
pA
Reset Voltage
Tamb = +25°C
Tmin. ≤ Tamb ≤ Tmax.
VRESET
Unit
V
0.4
0.3
1.1
Reset Current
10
Discharge Pin Leakage Current
1
1.5
2.0
pA
100
nA
DYNAMIC
Symbol
Parameter
Timing Accuracy (Monostable) - (note1)
R = 10kΩ , C = 0.1µF - (note 1)
Timing Shift with supply voltage variations (Monostable) - (note1)
R = 10kΩ , C = 0.1µF, V CC = +5V +/-1V
fmax
Min.
Typ.
Max.
Unit
%
2
%/V
0.38
Timing Shift with temperature - (note1)
Tmin .≤ Tamb ≤ Tmax.
75
Maximum astable frequency - (note 2)
R A = 470Ω , RB = 200Ω, C = 200pF
2.7
Astable frequency accuracy - (note 2)
R A = RB = 1kΩ to 100kΩ, C = 0.1µF
3
ppm/°C
MHz
%
%/V
Timing Shift with supply voltage variations (Astable mode) - (note 2)
R A = RB = 10kΩ, C = 0.1µF, VCC = +5V to+12V
0.1
tr
Output Rise Time (CLOAD = 10pF)
25
ns
tf
Output Fall Time (CLOAD = 10pF)
20
ns
Trigger Propagation Delay
100
ns
Minimum Reset Pulse Width (VTRIG = +5V)
350
ns
tPD
tRPW
Note :
4/8
TS3V555I
1. See Figure 2
2. See Figure 4
TS3V555
TYPICAL CHARACTERISTICS
Figure 1 :
Supply Current (each timer)
versus supply voltage.
SUPPLY CURRENT, I CC ( µA)
300
200
100
0
4
8
12
16
SUPPLY VOLTAGE, V CC (V)
APPLICATION INFORMATION
MONOSTABLE OPERATION
In the monostable mode,the timer functions as a
one-shot. Referring to figure 2 the external capacitor is initially held discharged by a transistor inside
the timer.
Figure 2
VCC
Reset
R
4
Trigger
Out
INPUT = 2.0V/div
7
TS3V555
6
C
OUTPUT VOLTAGE = 5.0V/div
5
3
1
Figure 3
t = 0.1 ms / div
8
2
The circuit triggers on a negative-goinginput signal
when the level reaches 1/3 VCC. 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.
Notice that since the charge rate 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 the Reset terminal (pin 4) and the
Trigger terminal (pin 2) during the timing cycle
discharges the external capacitor and causes the
cycle to start over. The timing cycle now starts on
the positive edge of the reset pulse. During the time
the reset pulse is applied, the output is driven to its
LOW state.
When a negative trigger pulse is applied to pin 2,
the flip-flop is set, releasing the short circuit across
the external capacitor and driving the output HIGH.
The voltage across the capacitor increases exponentially with the time constant τ = R x C.
When the voltage across the capacitor equals 2/3
VCC, the comparator resets the flip-flop which then
discharges the capacitor rapidly and drives the
output to its LOW state.
Figure 3 shows the actual waveforms generated in
this mode of operation.
When Reset is not used, it should be tied high to
avoid any possible or false triggering.
Control Voltage
0.01µF
CAPACITOR VOLTAGE = 2.0V/div
R = 9.1kΩ , C = 0.01µ F , RL = 1.0k Ω
5/8
TS3V555
ASTABLE OPERATION
The charge time (output HIGH) is given by :
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 RA an d RB and discharges
through RB only. Thus the duty cycle may be precisely set by the ratio of these two resistors.
In the astable mode of operation, C charges and
discharges between 1/3 VCC and 2/3 VCC. As in the
triggered mode, the charge and discharge times
and therefore frequency, are independent of the
supply voltage.
Figure 5 shows actual waveforms generated in this
mode of operation.
t1 = 0.693 (RA + RB) C
Figure 4
Figure 5
and the discharge time (output LOW) by :
t2 = 0.693 (RB) C
Thus the total period T is given by :
T = t1 + t2 = 0.693 (RA + 2RB) C
The frequency of oscillation is then :
f=
1
1.44
=
T (RA + 2RB) C
The duty cycle is given by : D =
RB
RA + 2RB
t = 0.5 ms / div
VCC
OUTPUT VOLTAGE = 5.0V/div
Reset
RA
4
Out
8
3
7
TS3V555
Control
Voltage
0.01 µ F
6/8
RB
6
5
1
2
C
CAPACITOR VOLTAGE = 1.0V/div
R = R = 4.8 kΩ, C = 0.1 µ F , R L = 1.0k Ω
A
B
TS3V555
PM-DIP8.EPS
PACKAGE MECHANICAL DATA
8 PINS - PLASTIC DIP
A
a1
B
b
b1
D
E
e
e3
e4
F
i
L
Z
Min.
Millimeters
Typ.
3.32
0.51
1.15
0.356
0.204
Max.
1.65
0.55
0.304
10.92
9.75
7.95
Min.
0.020
0.045
0.014
0.008
Max.
0.065
0.022
0.012
0.430
0.384
0.313
2.54
7.62
7.62
3.18
Inches
Typ.
0.131
0.100
0.300
0.300
6.6
5.08
3.81
1.52
0.125
0260
0.200
0.150
0.060
DIP8.TBL
Dimensions
7/8
TS3V555
PM-SO8.EPS
PACKAGE MECHANICAL DATA
8 PINS - PLASTIC MICROPACKAGE (SO)
Dimensions
Millimeters
Typ.
0.1
0.65
0.35
0.19
0.25
Max.
1.75
0.25
1.65
0.85
0.48
0.25
0.5
Min.
Inches
Typ.
0.026
0.014
0.007
0.010
Max.
0.069
0.010
0.065
0.033
0.019
0.010
0.020
0.189
0.228
0.197
0.244
0.004
o
45 (typ.)
4.8
5.8
5.0
6.2
1.27
3.81
3.8
0.4
0.050
0.150
4.0
1.27
0.6
0.150
0.016
0.157
0.050
0.024
o
8 (max.)
SO8.TBL
A
a1
a2
a3
b
b1
C
c1
D
E
e
e3
F
L
M
S
Min.
 1997 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved
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8/8
ORDER CODE :
Information furnished is believed to be 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 patent rights of SGS-THOMSON Microelectronics.
Specifications mentioned in this publication are subject to change without noti ce. 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.