TLC555-Q1 Datasheet, PDF (8/25 Pages) Texas Instruments – LinCMOS™ TIMER

TLC555-Q1
SLFS078B – OCTOBER 2006 – REVISED OCTOBER 2015
8 Detailed Description
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8.1 Overview
The TLC555-Q1 timer is used for general purpose timing applications from 476 ns to hours or from < 1 mHz to
2.1 MHz.
8.2 Functional Block Diagram
6
THRES
CONT
5
V_DD
8
R
R
RESET
4
R1
R1
S
3
OUT
2
TRIG
R
1
GND
RESET can override TRIG, which can override THRES.
7
DISCH
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 3. 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 R_A 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.
V_DD
(5 V to 15 V)
R_A
Input
5
CONT
4 _RESET
7 _DISCH
6 _THRES
2 _TRIG
8
V_DD
R_L
3
OUT
Output
GND
1
Figure 3. Circuit for Monostable Operation
8
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