MM74HC123AJ National Semiconductor, MM74HC123AJ Datasheet

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MM74HC123AJ

Manufacturer Part Number
MM74HC123AJ
Description
Dual Retriggerable Monostable Multivibrator
Manufacturer
National Semiconductor
Datasheet

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MM74HC123AJ
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ON
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C 1995 National Semiconductor Corporation
MM54HC123A MM74HC123A
Dual Retriggerable Monostable Multivibrator
General Description
The MM54 74HC123A 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-
Connection Diagram
Truth Table
Clear
u
X
X
H
H
L
Order Number MM54HC123A or MM74HC123A
Inputs
v
A
X
H
X
L
L
u
B
H
H
Dual-In-Line Package
X
X
L
Top View
TL F 5206
Q
L
L
L
Outputs
TL F 5206 – 1
Q
H
H
H
put pulse equation is simply 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
V
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
H
L
u
v
X
CC
e
e
e
e
e
e
e
Typical propagation delay 25 ns
Wide power supply range 2V – 6V
Low quiescent current 80 mA maximum (74HC Series)
Low input current 1 mA maximum
Fanout of 10 LS-TTL loads
Simple pulse width formula T
Wide pulse range 400 ns to % (typ)
Part to part variation
Schmitt Trigger A
rise and fall times
Timing Component
and ground
High Level
Low Level
Transition from Low to High
Transition from High to Low
One High Level Pulse
One Low Level Pulse
Irrelevant
TL F 5206 – 2
B inputs enable infinite signal input
g
5% (typ)
Note Pin 6 and Pin 14 must be
e
e
(R
hard-wired to GND
RC
EXT
RRD-B30M105 Printed in U S A
) (C
EXT
January 1988
) where PW

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MM74HC123AJ Summary of contents

Page 1

... 1995 National Semiconductor Corporation TL F 5206 put pulse equation is simply seconds ohms and farads All inputs are protected from damage due to static discharge by diodes to V and ground CC Features Typical propagation delay Wide power supply range 2V – Low quiescent current 80 mA maximum (74HC Series) ...

Page 2

... Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage ( Input Voltage ( Output Voltage ( OUT Clamp Diode Current ( Output Current per pin (I ) OUT GND Current per pin ( Storage Temperature Range (T ...

Page 3

AC Electrical Characteristics Symbol Parameter AC Electrical Characteristics Symbol Parameter Note 5 C determines the no load dynamic power consumption ...

Page 4

Logic Diagram Theory of Operation j POSITIVE EDGE TRIGGER NEGATIVE EDGE TRIGGER k l POSITIVE EDGE TRIGGER TRIGGER OPERATION As shown in Figure 1 and the logic diagram before an input trigger occurs the one shot is in the quiescent ...

Page 5

R toward V When the voltage across C EXT CC equals V comparator C2 changes state causing the REF2 output latch to reset (Q goes low) while at the same time disabling comparator C2 This ends the timing cycle ...

Page 6

... Physical Dimensions inches (millimeters) Order Number MM54HC123AJ or MM74HC123AJ LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or ...

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