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NE555 Datasheet(PDF) 9 Page - Texas Instruments

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Part No. NE555
Description  xx555 Precision Timers
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

NE555 Datasheet(HTML) 9 Page - Texas Instruments

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1
S
R
R1
TRIG
THRES
VCC
CONT
RESET
OUT
DISCH
GND
4
8
5
6
2
1
7
3
NA555, NE555, SA555, SE555
www.ti.com
SLFS022I – SEPTEMBER 1973 – REVISED SEPTEMBER 2014
8 Detailed Description
8.1 Overview
The xx555 timer is a popular and easy to use for general purpose timing applications from 10 µs to hours or from
< 1mHz to 100 kHz. In the time-delay or mono-stable mode of operation, the timed interval is controlled by a
single external resistor and capacitor network. In the a-stable mode of operation, the frequency and duty cycle
can be controlled independently with two external resistors and a single external capacitor. Maximum output sink
and discharge sink current is greater for higher VCC and less for lower VCC.
8.2 Functional Block Diagram
A.
Pin numbers shown are for the D, JG, P, PS, and PW packages.
B.
RESET can override TRIG, which can override THRES.
8.3 Feature Description
8.3.1 Mono-stable Operation
For mono-stable operation, any of these timers can be connected as shown in Figure 9. If the output is low,
application of a negative-going pulse to the trigger (TRIG) sets the flip-flop (Q goes low), drives the output high,
and turns off Q1. Capacitor C then is charged through RA until the voltage across the capacitor reaches the
threshold voltage of the threshold (THRES) input. If TRIG has returned to a high level, the output of the threshold
comparator resets the flip-flop (Q goes high), drives the output low, and discharges C through Q1.
Copyright © 1973–2014, Texas Instruments Incorporated
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Product Folder Links: NA555 NE555 SA555 SE555


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