TS3V555
3V
LOW POWER SINGLE TIMERS
.
.
.
.
.
.
.
.
DEDICATED TO
3.3V
OR
BATTERY SUPPLY
(Specified at 3V and 5V)
VERY LOW POWER CONSUMPTION :
90µA 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
Ω
PIN-TO-PIN AND FUNCTIONALLY COMPAT-
IBLE 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
V
CC
= 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 V
CC
= 3V and
2.7 MHz at V
CC
= 5V). Thus, either in monostable
or astable mode, timing remains very accurate.
Timing capacitors can also be minimized due to
high input impedance (10
12
Ω).
PIN CONNECTIONS
(top view)
ORDER CODES
Part Number
TS3V555I
Temperature
Range
-40, +125 C
o
Package
N
q
D
q
GND
Trigger
Output
Reset
1
2
3
4
8
7
6
5
V
CC
Discharge
Threshold
Control
Voltage
October 1997
1/8
TS3V555
BLOCK DIAGRAM
V
CC
8
Reset
4
3V555
R
R1
Threshold 6
Control
Voltage
5
R
+
Trigger 2
R
7 Discharge
1
Ground
-
B
+
R
-
A
S
Q
3 Output
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
TS3V555I,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
TS3V555
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)
o
T
amb
= +25 C
T
min.
≤
T
amb
≤
T
max
.
Control Voltage
o
T
amb
= +25 C
T
min.
≤
T
amb
≤
T
max
.
Discharge Saturation Voltage (I
DIS
= 1mA)
o
T
amb
= +25 C
T
min.
≤
T
amb
≤
T
max
.
Low Level Output Voltage (I
SINK
= 1mA)
o
T
amb
= +25 C
T
min.
≤
T
amb
≤
T
max
.
High Level Output Voltage (I
SOURCE
= -0.3mA)
o
T
amb
= +25 C
T
min.
≤
T
amb
≤
T
max
.
Trigger Voltage
o
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
0.4
0.3
2.5
2.5
0.9
0.8
1.8
1.7
TS3V555I
Min.
Typ.
90
Max.
230
230
2.2
2.3
V
0.05
-
0.1
0.2
0.25
V
0.3
0.35
V
2.9
V
1
10
10
1.1
10
1
100
1.5
2.0
pA
nA
1.1
1.2
pA
pA
V
Unit
µ
A
V
V
CL
2
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
.
fmax
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
t
r
t
f
t
PD
t
RPW
Note :
TS3V555I
Min.
Typ.
1
Max.
Unit
%
%/V
0.5
ppm/°C
75
MHz
2
%
5
%/V
0.5
25
20
100
350
ns
ns
ns
ns
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
3/8
TS3V555
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)
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
0.4
0.3
4.4
4.4
1.36
1.26
2.9
2.8
TS3V555I
Min.
Typ.
110
Max.
250
250
3.8
3.9
V
0.2
0.3
0.35
V
0.3
0.6
0.8
V
4.6
V
1.67
10
10
1.1
10
1
100
1.5
2.0
pA
nA
1.96
2.06
pA
pA
V
Unit
µ
A
V
V
CL
3.3
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
.
fmax
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
t
r
t
f
t
PD
t
RPW
Note :
TS3V555I
Min.
Typ.
2
Max.
Unit
%
%/V
0.38
ppm/°C
75
MHz
2.7
%
3
%/V
0.1
25
20
100
350
ns
ns
ns
ns
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
4/8
TS3V555
TYPICAL CHARACTERISTICS
The circuit triggers on a negative-goinginput signal
when the level reaches 1/3 V
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.
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
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 expo-
nentially with 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
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.
Figure 3
t = 0.1 ms / div
7
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
CC
Reset
R
4
Trigger
2
8
INPUT = 2.0V/div
TS3V555
Out
3
1
6
C
5
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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