©2002 Fairchild Semiconductor Corporation

www.fairchildsemi.com

Rev. 1.0.2

Features

• High Current Drive Capability (200mA)

• Adjustable Duty Cycle

• Temperature Stability of 0.005%/

°C

• Timing From Msec to Hours

• Turn Off Time Less Than 2Msec

Applications

• Precision Timing

• Pulse Generation

• Time Delay Generation

• Sequential Timing

Description

The KA555 is a highly stable controller capable of

producing accurate timing pulses. With monos table

operation, the time delay is controlled by one external

resistor and one capacitor. With astable operation, the

frequency and duty cycle are accurately controlled with two

external resistors and one capacitor.

8-DIP

8-SOP

1

1

Internal Block Diagram

F/F

OutPut

Stage

1

7

5

2

3

4

6

8

RR

R

Comp.

Comp.

Discharging Tr.

Vref

Vcc

Discharge

Threshold

Control

Voltage

GND

Trigger

Output

Reset

KA555

Single Timer