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
• Supply voltage
FEATURES
: 4.5 to 16 V
• Monostable and astable oscillation
• Circuit current (VCC = 5 V) : 3 mA
• Interfacing directly with TTL-level signals
• Output current capacity
: 200 mA
• Variable duty cycle
• Temperature stability
: 0.005%/°C
• Rising and falling time
: 100 ns
ORDERING INFORMATION
Part number
µPC1555C
PIN CONFIGURATION (TOP VIEW)
Package
8 VCC
GND 1
8-pin plastic DIP (300 mil)
µPC1555G2 8-pin plastic SOP (225 mil)
Trigger 2
R
COMP
Flip-flop
Output 3
7 Discharge
R
Output
stage
6 Threshold
COMP
R
5 Control voltage
Reset 4
VREF
EQUIVALENT CIRCUIT
8
R2
1 kΩ
VCC
Q6 Q5
6
Q1
Threshold 2 Q2 Q3
5 (3VCC)
Control
1
Q11
R3
5 kΩ
Q21
R1
10 kΩ
5 kΩ
Q8
4
Q25
Q28
R12
3.9
kΩ
R4
Q15
Trigger
Q27
R6
7.5kΩ
Q4
GND
2
Reset
7
Discharge
R11
Q22 6.2
kΩ
Q7
Q9
3
Q17
Q24
R7
4.7 kΩ
Q16
Q10
Q19
Q20
R10
Q23 120
Q18
Q12
Q13
R5
5 kΩ
Output
R8
100
Ω
Q26
R9
3.3kΩ
Q14
Document No. G10649EJ6V0DS00 (6th edition)
(Previous No. IC-1979)
Date Published November 1995 P
Printed in Japan
©
1986
