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MM54HC123A Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. MM54HC123A
Description  Dual Retriggerable Monostable Multivibrator
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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MM54HC123A Datasheet(HTML) 1 Page - National Semiconductor (TI)

   
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TLF5206
January 1988
MM54HC123AMM74HC123A
Dual Retriggerable Monostable Multivibrator
General Description
The MM5474HC123A high speed monostable multivibra-
tors (one shots) utilize advanced silicon-gate CMOS tech-
nology They feature speeds comparable to low power
Schottky TTL circuitry while retaining the low power and
high noise immunity characteristic of CMOS circuits
Each multivibrator features both a negative A and a posi-
tive B transition triggered input either of which can be
used as an inhibit input Also included is a clear input that
when taken low resets the one shot The ’HC123 can be
triggered on the positive transition of the clear while A is
held low and B is held high
The ’HC123A is retriggerable That is it may be triggered
repeatedly while their outputs are generating a pulse and
the pulse will be extended
Pulse width stability over a wide range of temperature and
supply is achieved using linear CMOS techniques The out-
put pulse equation is simply PWe(REXT)(CEXT) where PW
is in seconds R is in ohms and C is in farads All inputs are
protected from damage due to static discharge by diodes to
VCC and ground
Features
Y
Typical propagation delay 25 ns
Y
Wide power supply range 2V – 6V
Y
Low quiescent current 80 mA maximum (74HC Series)
Y
Low input current 1 mA maximum
Y
Fanout of 10 LS-TTL loads
Y
Simple pulse width formula T e RC
Y
Wide pulse range 400 ns to % (typ)
Y
Part to part variation g5% (typ)
Y
Schmitt TriggerAB inputs enable infinite signal input
rise and fall times
Connection Diagram
Dual-In-Line Package
TLF5206 – 1
Top View
Order Number MM54HC123A or MM74HC123A
Timing Component
TLF5206 – 2
Note
Pin 6 and Pin 14 must be
hard-wired to GND
Truth Table
Inputs
Outputs
Clear
AB
Q
Q
LX
X
L
H
XH
X
L
H
XX
L
L
H
HL
u
H
v
H
u
LH
H e High Level
L e Low Level
u e Transition from Low to High
v e Transition from High to Low
e
One High Level Pulse
e
One Low Level Pulse
X e Irrelevant
C1995 National Semiconductor Corporation
RRD-B30M105Printed in U S A


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