®
TS3V556
3V
LOW POWER DUAL TIMERS
.
.
.
.
.
.
.
.
DEDICATED TO
3.3V
OR
BATTERY SUPPLY
(Specified at 3V and 5V)
VERY LOW POWER CONSUMPTION :
90 A/tim at V
CC
= 3V
WIDE SINGLE SUPPLY RANGE :
+2.7V to +16V
HIGH OUTPUT CURRENT CAPABILITY
SUPPLY CURRENT SPIKES REDUCED
DURING OUTPUT TRANSITIONS
HIGH INPUT IMPEDANCE :
10
12
PIN-TO-PIN AND FUNCTIONALLY COMPATI-
BLE WITH BIPOLAR NE556 AND CMOS
TS556
OUTPUT COMPATIBLE WITH TTL,CMOS
AND LOGIC MOS
N
DIP14
(Plastic Package)
D
SO14
DESCRIPTION
The TS3V556 with its low consumption (90µA/tim
at V
CC
= 3V) is a dual CMOS timer dedicated to
3.3V or battery supply(specified at 3V and 5V offer-
ing also a high frequency (f
(max)
2MHz at V
CC
= 3V
and 2.7 MHz at V
CC
= 5V). Thus, either in mono-
stable or astable mode, timing remains very accu-
rate.
Timing capacitors can also be minimized due to
high input impedance (10
12
Ω).
PIN CONNECTIONS
(top view)
ORDER CODES
Part Number
TS3V556I
Temperature
Range
-40, +125 C
o
Package
N
l
D
l
Discha rge
1
14
13
12
11
10
V
C C
D isc ha rge
T h r e s h o ld
2
Co n t r o l Vo l t a g e 3
Th res ho ld
Re se t
4
5
Co n t r o l Vo l t a g e
Ou t p u t
Re s e t
Tr ig g e r
6
7
9
8
Out put
Trigge r
GND
May 2000
1/8
TS3V556
BLOCK DIAGRAM
(1/2 TS3V556)
V
CC
14
Reset
4 / 10
3V556
R
2 / 12
R1
+
Threshold
Control
Voltage
Q
5/9
Output
R
-
A
S
3 / 11
R
+
Trigger
6/8
-
B
1 / 13
R
7
Discharge
Ground
FUNCTION TABLE
RESET
Low
High
High
High
TRIGGER
x
Low
High
High
THRESHOLD
x
x
High
Low
OUTPUT
Low
High
Low
Previous State
LOW
HIGH
X
Level Voltage
≤
Min voltage specified
Level Voltage
≥
Max voltage specified
Irrelevant
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
T
J
Parameter
Supply Voltage
Junction Temperature
Value
+18
+150
Unit
V
o
C
THERMAL CHARACTERISTICS
Symbol
T
oper
T
stg
Parameter
Operating Temperature Range
TS3V556I,AI
Storage Temperature Range
Value
-40 to +125
-65 to +150
o
Unit
o
C
C
OPERATING CONDITIONS
Symbol
V
CC
Supply Voltage
Parameter
Value
+2.7 to +16
Unit
V
2/8
TS3V556
ELECTRICAL CHARACTERISTICS
V
CC
=
+3V , T
amb
=
+25
o
C , Reset to V
CC
(unless otherwise specified)
STATIC
Symbol
I
CC
Parameter
Supply Current - (no load, High and Low States, per
timer)
T
amb
= +25
o
C
T
min.
®
T
amb
®
T
max
.
Control Voltage
T
amb
= +25
o
C
T
min.
®
T
amb
®
T
max
.
Discharge Saturation Voltage (I
DIS
= 1mA)
T
amb
= +25
o
C
T
min.
®
T
amb
®
T
max
.
Low Level Output Voltage (I
SINK
= 1mA)
T
amb
= +25
o
C
T
min.
®
T
amb
®
T
max
.
High Level Output Voltage (I
SOURCE
= -0.3mA)
T
amb
= +25
o
C
T
min.
®
T
amb
®
T
max
.
Trigger Voltage
T
amb
= +25
o
C
T
min.
®
T
amb
®
T
max
.
Trigger Current
Threshold Current
Reset Voltage
T
amb
= +25°C
T
min
.
®
T
amb
®
T
max.
Reset Current
Discharge Pin Leakage Current
1.8
1.7
Min.
TS3V556I
Typ.
90
Max.
230
230
Unit
µ
A
V
CL
V
2
2.2
2.3
V
0.05
-
0.1
0.2
0.25
V
0.3
0.35
V
2.5
2.5
0.9
0.8
2.9
V
1
10
10
0.4
0.3
1.1
10
1
1.5
2.0
100
pA
nA
1.1
1.2
pA
pA
V
V
DIS
V
OL
V
OH
V
TRIG
I
TRIG
I
TH
V
RESET
I
RESET
I
DIS
DYNAMIC
Symbol
Parameter
Timing Accuracy (Monostable)
R = 10kΩ , C = 0.1µF - (note 1)
Timing Shift with supply voltage variations (Monostable)
R = 10kΩ , C = 0.1µF, V
CC
= +3V +/-0.3V - (note 1)
Timing Shift with temperature - (note 1)
T
min.
®
T
amb
®
T
max
.
Maximum astable frequency - (note 2)
R
A
= 470
Ω
, R
B
= 200
Ω,
C = 200pF
Astable frequency accuracy - (note 2)
R
A
= R
B
= 1k
Ω
to 100k
Ω
, C = 0.
1µ
F
Timing Shift with supply voltage variations (Astable mode) - (note
2)
R
A
= R
B
= 10k
Ω
, C = 0.1
µ
F, V
CC
= +3 to+5V
Output Rise Time (C
LOAD
= 10pF)
Output Fall Time (C
LOAD
= 10pF)
Trigger Propagation Delay
Minimum Reset Pulse Width (V
TRIG
= +3V)
1. See Figure 2
2. See Figure 4
Min.
TS3V556I
Typ.
Max.
1
Unit
%
%/V
0.5
75
2
%
5
%/V
0.5
25
20
100
350
ns
ns
ns
ns
ppm/°
C
MHz
fmax
t
r
t
f
t
PD
t
RPW
Note :
3/8
TS3V556
ELECTRICAL CHARACTERISTICS
V
CC
=
+5V , T
amb
=
+25
o
C , Reset to V
CC
(unless otherwise specified)
STATIC
Symbol
I
CC
Parameter
Supply Current - (no load, High and Low States, per
timer)
T
amb
= +25°C
T
min
.
®
T
amb
®
T
max
.
Control Voltage
T
amb
= +25°C
T
min
.
®
T
amb
®
T
max
.
Discharge Saturation Voltage (I
DIS
= 10mA)
T
amb
= +25°C
T
min
.
®
T
amb
®
T
max
.
Low Level Output Voltage (I
SINK
= 8mA)
T
amb
= +25°C
T
min
.
®
T
amb
®
T
max
.
High Level Output Voltage (I
SOURCE
= -2mA)
T
amb
= +25°C
T
min
.
®
T
amb
®
T
max
.
Trigger Voltage
T
amb
= +25°C
T
min
.
®
T
amb
®
T
max
.
Trigger Current
Threshold Current
Reset Voltage
T
amb
= +25°C
T
min
.
®
T
amb
®
T
max
.
Reset Current
Discharge Pin Leakage Current
Min.
TS3V556I
Typ.
110
Max.
250
250
Unit
µ
A
V
CL
V
2.9
2.8
3.3
3.8
3.9
V
0.2
0.3
0.35
V
0.3
0.6
0.8
V
4.4
4.4
1.36
1.26
4.6
V
1.67
10
10
0.4
0.3
1.1
10
1
1.5
2.0
100
pA
nA
1.96
2.06
pA
pA
V
V
DIS
V
OL
V
OH
V
TRIG
I
TRIG
I
TH
V
RESET
I
RESET
I
DIS
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
Timing Shift with temperature - (note1)
T
min
.®
T
amb
®
T
max
.
Maximum astable frequency - (note 2)
R
A
= 470Ω , R
B
= 200Ω, C = 200pF
Astable frequency accuracy - (note 2)
R
A
= R
B
= 1k
Ω
to 100
kΩ
, C = 0.
1µ
F
Timing Shift with supply voltage variations (Astable mode) - (note
2)
R
A
= R
B
= 10k
Ω
, C = 0.1
µ
F, V
CC
= +5V to+12V
Output Rise Time (C
LOAD
= 10pF)
Output Fall Time (C
LOAD
= 10pF)
Trigger Propagation Delay
Minimum Reset Pulse Width (V
TRIG
= +5V)
1. See Figure 2
2. See Figure 4
Min.
TS3V556I
Typ.
Max.
2
Unit
%
%/V
0.38
75
2.7
%
3
%/V
0.1
25
20
100
350
ns
ns
ns
ns
ppm/°
C
MHz
fmax
t
r
t
f
t
PD
t
RPW
Note :
4/8
TS3V556
TYPICAL CHARACTERISTICS
The circuit triggers on a negative-going input signal
when the level reaches 1/3 V
CC
. Once triggered,the
circuit remains in this state until the set time has
elapsed,even if it is triggered again during this in-
terval. 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 propor-
tional to supply voltage, the timing interval is inde-
pendent of supply. Applying a negative pulse
simultaneously to the Reset terminal (pin 4 or 10)
and the Trigger terminal (pin 2 or 8) during the tim-
ing 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. Dur-
ing the time the reset pulse is applied, the output is
driven to its LOW state.
When a negative trigger pulse is applied to the trig-
ger terminal, the flip-flop is set, releasing the short
circuit across the external capacitor and driving the
output HIGH. The voltage across the capacitor in-
creases exponentiallywith the time constant
τ
= R x
C.
When the voltage across the capacitor equals 2/3
V
CC
, the comparator resets the flip-flop which then
discharges the capacitor rapidly and drives the out-
put 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.
Figure 3
t = 0.1 ms / div
INPUT = 2.0V/div
C
Figure 1 :
300
SUPPLY CURRENT, I
CC
(
µ
A)
Supply Current (each timer)
versus supply voltage.
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 capaci-
tor is initially held discharged by a transistor inside
the timer.
Figure 2
V
C
C
Reset
R
Trigger
1/2
TS3V556
Out
Control Voltage
0.01
µ
F
OUTPUT VOLTAGE = 5.0V/div
CAPACITOR VOLTAGE = 2.0V/div
R = 9.1k
Ω
, C = 0.01
µ
F , RL = 1.0k
Ω
5/8
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