DATA SHEET
MOS INTEGRATED CIRCUIT
Bipolar Analog Integrated Circuit
µ
PC1555
TIMER CIRCUIT
The
µ
PC1555 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
• Supply voltage
• Output current capacity
• Temperature stability
• Rising and falling time
: 4.5 to 16 V
: 200 mA
: 0.005%/°C
: 100 ns
• Circuit current (V
CC
= 5 V) : 3 mA
FEATURES
• Monostable and astable oscillation
• Interfacing directly with TTL-level signals
• Variable duty cycle
ORDERING INFORMATION
Part number
Package
8-pin plastic DIP (300 mil)
PIN CONFIGURATION (TOP VIEW)
µ
PC1555C
GND 1
8 V
CC
µ
PC1555G2 8-pin plastic SOP (225 mil)
Trigger 2
COMP
Flip-flop
R
R
COMP
7 Discharge
Output 3
Output
stage
6 Threshold
R
5 Control voltage
V
REF
Reset 4
EQUIVALENT CIRCUIT
8
V
CC
Q
6
Q
5
Q
11
R
2
1 k
Ω
R
3
5 k
Ω
Q
22
6.2
k
Ω
R
11
6
Threshold 2
Q
2
Q
3
5 (3V
CC
)
Control
1
GND
2
Trigger
Reset
7
Discharge
4
Q
25
Q
1
Q
4
Q
21
R
4
R
6
7.5k
Ω
Q
27
Q
28
R
12
3.9
k
Ω
3
R
1
10 k
Ω
5 k
Ω
Q
15
Q
8
Q
9
Q
16
Q
17
R
7
4.7 k
Ω
Q
19
Q
18
Q
20
Q
24
Output
Q
7
Q
12
Q
10
R
5
Q
23
120
R
10
R
9
3.3k
Ω
Q
26
Q
13
5 k
Ω
R
8
100
Ω
Q
14
Document No. G10649EJ6V0DS00 (6th edition)
(Previous No. IC-1979)
Date Published November 1995 P
Printed in Japan
©
1986
NEC [ NEC ]
