UNISONIC TECHNOLOGIES CO., LTD
SA555
PRECISION TIMERS
DESCRIPTION
SOP-8
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LINEAR INTEGRATED CIRCUIT
The UTC
SA555
monolithic timing circuit is a highly stable
controller capable of producing accurate time delays or
oscillation. In the time-delay or monostable mode of operation,
the timed interval is controlled by a single external resistor and
capacitor network.
In the astable mode of operation, the frequency and duty cycle
can be controlled independently with two external resistors and a
single external capacitor.
The threshold and trigger levels normally are two-thirds and
one-third, respectively, of V
CC
. These levels can be altered by use
of the control-voltage terminal. When the trigger input falls below
the trigger level, the flip-flop is set, and the output goes high. If
the trigger input is above the trigger level and the threshold input
is above the threshold level, the flip-flop is reset and the output is
low. The reset (RESET) input can override all other inputs and
can be used to initiate a new timing cycle. When RESET goes
low, the flip-flop is reset, and the output goes low. When the
output is low, a low-impedance path is provided between
discharge (DISCH) and ground.
The circuit may be triggered and reset on falling waveforms,
and the output structure can source or sink up to 200mA.
Operation is specified for supplies of 5V~15V.
DIP-8
FEATURES
* Astable or monostable operation
* Low turn off time
* Operates in both astable and monostable modes
* Timing from microseconds to hours
* Adjustable duty cycle
* TTL-compatible output can sink or source up to 200Ma
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
SA555L-S08-R
SA555G-S08-R
SA555L-S08-T
SA555G-S08-T
SA555L-D08-T
SA555G-D08-T
xx: Output Voltage, refer to Marking Information.
Package
SOP-8
SOP-8
DIP-8
Packing
Tape Reel
Tube
Tube
Note:
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
1 of 6
QW-R106-005.a
SA555
PIN CONFIGURATION
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LINEAR INTEGRATED CIRCUIT
GND 1
TRIG 2
OUT
3
8
7
6
5
V
CC
DISCH
THRES
CONT
RESET 4
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
PIN NAME
GND
TRIG
OUT
RESET
CONT
THRES
DISCH
V
CC
DESCRIPTION
Ground
Trigger signal
Output terminal
Reset terminal
Control voltage
Threshold
Discharge
Power supply
BLOCK DIAGRAM
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QW-R106-005.a
SA555
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LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
over operating free-air temperature range (unless otherwise noted)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage (Note 2)
V
CC
18
V
Input Voltage
CONT, RESET, THRES, TRIG
V
I
V
CC
V
Output Current
I
O
±225
mA
Operating Virtual Junction Temperature
T
J
150
°C
Storage Temperature
T
STG
-65~150
°C
Note: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2. All voltage values are with respect to GND.
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless
otherwise noted)
PARAMETER
SYMBOL
V
CC
V
I
I
O
T
A
RATINGS
4.5~16
V
CC
±200
-40~85
UNIT
V
V
mA
°C
Supply Voltage
Input Voltage
Output Current
Operating Free-Air Temperature
THERMAL DATA
PARAMETER
SYMBOL
RATINGS
UNIT
SOP-8
97
°C/W
Package Thermal Impedance (Note 1, 2)
θ
JA
DIP-8
85
°C/W
Notes: 1. Maximum power dissipation is a function of T
J(max)
,
θ
JA
, and T
A
. The maximum allowable power dissipation
at any allowable ambient temperature is P
D
=(T
J(max)
-T
A
)/θ
JA
. Operating at the absolute maximum T
J
of
150°C can affect reliability.
2. The package thermal impedance is calculated in accordance with JESD 51-7.
ELECTRICAL CHARACTERISTICS
V
CC
=5V~5V, T
A
=25°C (unless otherwise noted)
PARAMETER
SYMBOL
V
TH
I
TH
V
TRIG
I
TRIG
V
RESET
I
RESET
I
DISCH
V
CONT
V
CC
=15V
V
CC
=5V
V
CC
=15V, I
OL
=10mA
V
CC
=15V, I
OL
=50mA
V
CC
=15V, I
OL
=100mA
V
CC
=15V, I
OL
=200mA
V
CC
=5V, I
OL
=5mA
V
CC
=5V, I
OL
=8mA
V
CC
=15V, I
OL
=-100mA
V
CC
=15V, I
OL
=-200mA
V
CC
=5V, I
OL
=-100mA
9
2.6
V
CC
=15V
V
CC
=5V
TRIG at 0V
RESET at V
CC
RESET at 0V
4.5
1.1
0.3
TEST CONDITIONS
V
CC
=15V
V
CC
=5V
MIN
8.8
2.4
TYP
10
3.3
30
5
1.67
0.5
0.7
0.1
-0.4
20
10
3.3
0.1
0.4
2
2.5
0.1
0.15
13.3
12.5
3.3
MAX
11.2
4.2
250
5.6
2.2
2
1
0.4
-1.5
100
11
4
0.25
0.75
2.5
0.35
0.4
UNIT
V
V
nA
V
V
µA
V
mA
mA
nA
V
V
V
V
V
V
V
V
V
V
V
THRES Voltage Level
THRES Current (Note)
TRIG Voltage Level
TRIG Current
RESET Voltage Level
RESET Current
DISCH Switch Off-State Current
CONT Voltage (Open Circuit)
Low-Level Output Voltage
V
OL
12.75
2.75
High-Level Output Voltage
V
OH
UNISONIC TECHNOLOGIES CO., LTD
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QW-R106-005.a
SA555
PARAMETER
SYMBOL
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LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(Cont.)
TEST CONDITIONS
MIN
TYP
MAX
UNIT
V
CC
=15V
10
15
mA
Output Low,
No Load
V
CC
=5V
3
6
mA
Supply Current
I
CC
V
CC
=15V
9
13
mA
Output High,
No Load
V
CC
=5V
2
5
mA
Note: This parameter influences the maximum value of the timing resistors R
A
and R
B
in the circuit of Figure 2. For
example, when V
CC
=5V, the maximum value is R=R
A
+R
B
≠3.4MΩ,
and for V
CC
=15V, the maximum value is
10MΩ.
OPERATING CHARACTERISTICS
V
CC
=5V~15V, T
A
=25°C (unless otherwise noted)
PARAMETER
SYMBOL
TEST CONDITIONS
(Note 1)
MIN
TYP
MAX
UNIT
Each Timer, Monostable
T
A
=25°C
1
3
%
(Note 3)
Each Timer, Astable
2.25
%
(Note 4)
Each Timer, Monostable
T
A
=MIN~MAX
50
ppm/°C
Temperature
(Note 3)
Coefficient of
Each Timer, Astable
Timing Interval
150
ppm/°C
(Note 4)
Each Timer, Monostable
T
A
=25°C
0.1
0.5
%/V
Supply-Voltage
(Note 3)
Sensitivity of
Each Timer, Astable
Timing Interval
0.3
%/V
(Note 4)
Output-Pulse Rise Time
T
R
C
L
=15pF, T
A
=25°C
100
300
ns
Output-Pulse Fall Time
T
F
C
L
=15pF, T
A
=25°C
100
300
ns
Notes: 1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating
conditions.
2. Timing interval error is defined as the difference between the measured value and the average value of a
random sample from each process run.
3. Values specified are for a device in a monostable circuit similar to Figure 1, with the following component
values: R
A
=2kΩ~100kΩ, C=0.1µF.
4. Values specified are for a device in an astable circuit similar to Figure 2, with the following component
values: R
A
=1kΩ~100kΩ, C=0.1µF.
Initial Error of
Timing Interval
(Note 2)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R106-005.a
SA555
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LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
V
CC
(5V~15V)
R
A
4
7
6
Input
2
RESET
DISCH
5
CONT
8
V
CC
R
L
OUT
THRES
TRIG
GND
1
3
Output
Figure 1. Circuit for Monostable Operation
V
CC
(5V~15V)
0.01µF
Open
R
A
(see Note 1)
4
7
R
B
6
2
C
5
CONT
RESET
DISCH
OUT
THRES
TRIG
GND
1
3
Output
8
V
CC
R
L
Note 1. Decoupling CONT voltage to ground with a capacitor can improve
operation. This should be evaluated for individual applications.
Figure 2. Circuit for Astable Operation
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R106-005.a
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