©

1986

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

• 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

PIN CONFIGURATION (TOP VIEW)

Part number

Package

µPC1555C

8-pin plastic DIP (300 mil)

µPC1555G2 8-pin plastic SOP (225 mil)

EQUIVALENT CIRCUIT

DATA SHEET

Document No.

G10649EJ6V0DS00 (6th edition)

(Previous No. IC-1979)

Date Published November 1995 P

Printed in Japan

TIMER CIRCUIT

MOS INTEGRATED CIRCUIT

Bipolar Analog Integrated Circuit

µPC1555

1

GND

Trigger

Output

Reset

VCC

Discharge

Threshold

Control voltage

2

3

4

8

7

R

COMP

COMP

R

R

VREF

6

5

Flip-flop

Output

stage

VCC

R2

8

6

5

2

(3VCC)

1

2

4

7

GND

Q5

R4

R5

Q11

Q6

Q3

Q2

Q8

Q15

Q22

Q27

Q18

Q19

Q20

Q23

Q26

Q16

Q21

Q17

Q24

Q28

Q7

Q12

Q25

Q14

Q13

Q10

Q9

Q1

Q4

1 k

Ω

R3

5 k

Ω

R7

4.7 k

Ω

R8

100

Ω

3.3k

Ω

R10

120

R6

7.5k

Ω

R11

6.2

k

Ω

R12

3

3.9

k

Ω

R1

10 k

Ω

5 k

Ω

5 k

Ω

Output

Threshold

Control

Trigger

Reset

Discharge

R9