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NE555 Datasheet(PDF) 2 Page - Texas Instruments

Part No. NE555
Description  PRECISION TIMERS SE555C FROM TI IS NOT RECOMMENDED FOR NEW DESIGNS
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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SLFS022 – D1669, SEPTEMBER 1973—REVISED FEBRUARY 1992
NE555, NE555Y, SA555, SE555, SE555C
PRECISION TIMERS
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
2
FUNCTION TABLE
RESET
TRIGGER VOLTAGE†
THRESHOLD VOLTAGE†
OUTPUT
DISCHARGE SWITCH
Low
Irrelevant
Irrelevant
Low
On
High
< 1/3 VDD
Irrelevant
High
Off
High
> 1/3 VDD
> 2/3 VDD
Low
On
High
> 1/3 VDD
< 2/3 VDD
As previously established
† Voltage levels shown are nominal.
functional block diagram
1
R
R
S
R
R1
TRIG
THRES
R
VCC
CONT
RESET
OUT
DISCH
GND
RESET can override TRIG, which can override THRES.
Pin numbers shown are for the D, JG, and P packages only.
4
8
5
6
2
1
7
3




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