NE556 datasheet(1/16 Pages) STMICROELECTRONICS

Part #	NE556

Description	General-purpose dual bipolar timers

PDF	16 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 16 page

January 2009

Rev 2

1/16

16

NE556

SA556 - SE556

General-purpose dual bipolar timers

Features

■ Low turn-off time

■ Maximum operating frequency greater than

500 kHz

■ Timing from microseconds to hours

■ Operates in both astable and monostable

modes

■ Output can source or sink up to 200 mA

■ Adjustable duty cycle

■ TTL compatible

■ Temperature stability of 0.005% per °C

Description

The NE556, SA556 and SE556 dual monolithic

timing circuits are highly stable controllers

capable of producing accurate time delays or

oscillation. In the time delay mode of operation,

the time is precisely controlled by one external

resistor and capacitor. For a stable operation as

an oscillator, the free running frequency and the

duty cycle are both accurately controlled with two

external resistors and one capacitor.

The circuits may be triggered and reset on falling

waveforms, and the output structure can source

or sink up to 200 mA.

N

DIP14

(Plastic package)

D

SO14

(Plastic micropackage)

Pin connections

(top view)

Trigger

Output

Control Voltage

4

8

5

6

7

9

10

11

12

13

14

Trigger

Threshold

Discharge

Reset

Output

Discharge

GND

1

2

3

Threshold

Control Voltage

Reset

CC

V

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