DATA SHEET
MOS INTEGRATED CIRCUIT
Bipolar Analog Integrated Circuit
µPC1555
TIMER CIRCUIT
The µPC1555 is a powerful integrated circuit. Adding a few external parts to it can turn it into various types of
timing signal generators, such as monostable and astable multivibrators. It has trigger, threshold, and control pins.
Inputting a signal to the reset pin can stop the circuit operation easily. In addition, the output can sink current as high
as 200 mA (maximum). So, it can be used to drive relays and lamps.
TYPICAL CHARACTERISTICS
FEATURES
• Supply voltage
: 4.5 to 16 V
• Monostable and astable oscillation
• Interfacing directly with TTL-level signals
• Variable duty cycle
• Circuit current (VCC = 5 V) : 3 mA
• Output current capacity
• Temperature stability
• Rising and falling time
: 200 mA
: 0.005%/°C
: 100 ns
ORDERING INFORMATION
PIN CONFIGURATION (TOP VIEW)
Part number
Package
GND
1
2
3
4
8
7
6
5
VCC
µPC1555C 8-pin plastic DIP (300 mil)
µPC1555G2 8-pin plastic SOP (225 mil)
R
R
R
COMP
Trigger
Output
Discharge
Threshold
Flip-flop
Output
stage
COMP
Reset
Control voltage
VREF
EQUIVALENT CIRCUIT
8
R
12k
Ω
V
CC
R
11
6.2
Ω
Q
22
Q
6
Q
5
Q
11
k
R
53k
Ω
Q
27
R
6
Q
28
7.5k
Ω
6
R
12
3.9
Q
1
Q
4
Threshold
5
Q
2
Q
3
2
Q
21
kΩ
(3VCC
)
R4
3
Control
R
1
Q
17
5 k
Ω
Ω
10 k
Ω
Q
24
Output
1
R
7
Q
15
Q
16
4.7 k
Ω
GND
2
Q
8
Q
9
Q
20
Q
10
R
10
Q
7
Q
19
Trigger
4
23 120
Q
Q
18
Q
26
R
8
R
9
R5
Q
12
Q
13
100
Reset
3.3k
Ω
Q
25
5 k
Ω
7
Discharge
Q
14
Document No. G10649EJ6V0DS00 (6th edition)
(Previous No. IC-1979)
Date Published November 1995 P
Printed in Japan
1986
©