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SN74LV123A-Q1 Datasheet(PDF) 2 Page - Texas Instruments

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Part No. SN74LV123A-Q1
Description  DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR WITH SCHMITT - TRIGGER INPUTS
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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SN74LV123A-Q1 Datasheet(HTML) 2 Page - Texas Instruments

 
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SN74LV123AQ1
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
WITH SCHMITT TRIGGER INPUTS
SCLS467B − FEBRUARY 2003 − REVISED MAY 2004
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input
pulse. The A, B, and CLR inputs have Schmitt triggers with sufficient hysteresis to handle slow input transition
rates with jitter-free triggering at the outputs.
Once triggered, the basic pulse duration can be extended by retriggering the gated low-level-active (A) or
high-level-active (B) input. Pulse duration can be reduced by taking CLR low. The input/output timing diagram
illustrates pulse control by retriggering the inputs and early clearing.
During power up, Q outputs are in the low state, and Q outputs are in the high state. The outputs are glitch free,
without applying a reset pulse.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
FUNCTION TABLE
(each multivibrator)
INPUTS
OUTPUTS
CLR
A
B
Q
Q
L
X
X
L
H
X
HX
L†
H†
X
XL
L†
H†
H
L
H
H
L
H
† These outputs are based on the
assumption
that
the
indicated
steady-state conditions at the A and
B inputs have been set up long enough to
complete any pulse started before the
setup.
logic diagram, each multivibrator (positive logic)
CLR
Cext
Rext/Cext
R
B
A
Q
Q


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