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555

PRECISION TIMERS

Diodes Incorporated. 

NE555/SA555/NA555

PRECISION TIMERS

Pin Descriptions

Pin Name

GND

TRIG

OUT

RESET

CONT

THRES

DISCH

VCC

Pin Number

1

2

3

4

5

6

7

8

Description

Ground

Trigger set 1/3VCC

Timer output

Reset active low

External adjustment of internal threshold and trigger voltages

Threshold set to 2/3 VCC

Low impedance discharge path

Chip supply voltage

Functional Block Diagram

RESET can override TRIG, which can override THRESH

Functional Table

Pin Name

GND

TRIG

OUT

RESET

Nominal Trigger

Voltage

Irrelevant

<1/3VCC

<1/3VCC

<1/3VCC

Threshold

Voltage

Irrelevant

Irrelevant

<2/3VCC

<2/3VCC

Output

Discharge

Switch

Low

On

High

Off

Low

On

As previously established

NE555/SA555/NA555

Document number: DS35112 Rev. 4 - 2

2 of 14

www.diodes.com

February 2012

© Diodes Incorporated

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