NE556 데이터 시트보기 (PDF) - STMicroelectronics

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NE556

General-purpose dual bipolar timers

STMicroelectronics 

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)

Discharge 1

Threshold 2

Control Voltage 3

Reset 4

Output 5

Trigger 6

GND 7

14 VCC

13 Discharge

12 Threshold

11 Control Voltage

10 Reset

9 Output

8 Trigger

January 2009

Rev 2

1/16

www.st.com

16

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