SA555 View Datasheet(PDF) - Diodes Incorporated.
Part Name
Description
Manufacturer
SA555 Datasheet PDF : 14 Pages
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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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