MM74HC423A Monostable Multivibrator Datasheet

MM74HC423A Datasheet, PDF, Equivalent


Part Number

MM74HC423A

Description

Dual Retriggerable Monostable Multivibrator

Manufacture

Fairchild

Total Page 9 Pages
Datasheet
Download MM74HC423A Datasheet


MM74HC423A
September 1983
Revised February 1999
MM74HC423A
Dual Retriggerable Monostable Multivibrator
General Description
The 74HC423A high speed monostable multivibrators (one
shots) utilize advanced silicon-gate CMOS technology.
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 MM74HC423A
cannot be triggered from clear.
The MM74HC423A is retriggerable. That is, it may be trig-
gered repeatedly while its 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: PW = (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
s Typical propagation delay: 40 ns
s Wide power supply range: 2V–6V
s Low quiescent current: 80 µA maximum (74HC Series)
s Low input current: 1 µA maximum
s Fanout of 10 LS-TTL loads
s Simple pulse width formula T = RC
s Wide pulse range: 400 ns to (typ)
s Part to part variation: ±5% (typ)
s Schmitt Trigger A & B inputs allow infinite rise and fall
times on these inputs
Ordering Code:
Order Number Package Number
Package Description
MM74HC423AM
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow
MM74HC423ASJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HC423AMTC
MTC16
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
MM74HC423AN
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagrams
Pin Assignments for DIP, SOIC, SOP and TSSOP
Timing Component
Top View
Note: Pin 6 and Pin 14 must be hard-wired to GND.
© 1999 Fairchild Semiconductor Corporation DS005338.prf
www.fairchildsemi.com

MM74HC423A
Truth Table
H = HIGH Level
L = LOW Level
↑ = Transition from LOW-to-High
↓ = Transition from HIGH-to-LOW
= One HIGH Level Pulse
= One LOW Level Pulse
X = Irrelevant
Logic Diagram
Inputs
Outputs
Clear A B Q Q
L XXLH
X HXLH
X XLLH
H L
H H
www.fairchildsemi.com
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Features MM74HC423A Dual Retriggerable Monostable Multivibrator September 1983 Revised February 1999 MM74HC423A Dual Retrigge rable Monostable Multivibrator General Description The 74HC423A high speed mon ostable multivibrators (one shots) util ize advanced silicon-gate CMOS technolo gy. They feature speeds comparable to l ow power Schottky TTL circuitry while r etaining the low power and high noise i mmunity characteristic of CMOS circuits . Each multivibrator features both a ne gative, A, and a positive, B, transitio n triggered input, either of which can be used as an inhibit input. Also inclu ded is a clear input that when taken LO W resets the one shot. The MM74HC423A c annot be triggered from clear. The MM74 HC423A is retriggerable. That is, it ma y be triggered repeatedly while its out puts are generating a pulse and the pul se will be extended. Pulse width stabil ity over a wide range of temperature an d supply is achieved using linear CMOS techniques. The output pulse equation is simply: PW = (REXT) (C.
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