74HC123A

© 2013 Rochester Electronics, LLC. All Rights Reserved 04242013

Specification Number 74HC123-I (F) Rev C

Page 1 of 4

© 2001 Fairchild Semiconductor Corporation

DS005206

www.fairchildsemi.com

September 1983

Revised May 2001

MM74HC123A

Dual Retriggerable Monostable Multivibrator

General Description

The MM74HC123A high speed monostable multivibrators

(one shots) utilize advanced silicon-gate CMOS technol-

ogy. They feature speeds comparable to low power Schot-

tky 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 MM74HC123A

can be triggered on the positive transition of the clear while

A is held LOW and B is held HIGH.

The MM74HC123A is retriggerable. That is it may be trig-

gered 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-

PW is in seconds, R is in ohms, and C is in farads. All

inputs are protected from damage due to static discharge

Features

Typical propagation delay: 25 ns

Wide power supply range: 2V–6V

Low quiescent current: 80 µA maximum (74HC Series)

Low input current: 1 µA maximum

Fanout of 10 LS-TTL loads

Simple pulse width formula T = RC

Wide pulse range: 400 ns to ∞ (typ)

Part to part variation: ±5% (typ)

Schmitt Trigger A & B inputs allow rise and fall times to

be as slow as one second

Ordering Code:

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Connection Diagram

Top View

Timing Component

Note: Pin 6 and Pin 14 must be hard-wired to GND.

Order Number

Package Number

Package Description

MM74HC123AM

M16A

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

MM74HC123ASJ

M16D

16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

MM74HC123AMTC

MTC16

16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

MM74HC123AN

N16E

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

© 2001 Fairchild Semiconductor Corporation

DS005206

www.fairchildsemi.com

September 1983

Revised May 2001

MM74HC123A

Dual Retriggerable Monostable Multivibrator

General Description

The MM74HC123A high speed monostable multivibrators

(one shots) utilize advanced silicon-gate CMOS technol-

ogy. They feature speeds comparable to low power Schot-

tky 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 MM74HC123A

can be triggered on the positive transition of the clear while

A is held LOW and B is held HIGH.

The MM74HC123A is retriggerable. That is it may be trig-

gered 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-

PW is in seconds, R is in ohms, and C is in farads. All

inputs are protected from damage due to static discharge

Features

Typical propagation delay: 25 ns

Wide power supply range: 2V–6V

Low quiescent current: 80 µA maximum (74HC Series)

Low input current: 1 µA maximum

Fanout of 10 LS-TTL loads

Simple pulse width formula T = RC

Wide pulse range: 400 ns to ∞ (typ)

Part to part variation: ±5% (typ)

Schmitt Trigger A & B inputs allow rise and fall times to

be as slow as one second

Ordering Code:

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Connection Diagram

Top View

Timing Component

Note: Pin 6 and Pin 14 must be hard-wired to GND.

Order Number

Package Number

Package Description

MM74HC123AM

M16A

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

MM74HC123ASJ

M16D

16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

MM74HC123AMTC

MTC16

16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

MM74HC123AN

N16E

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

Rochester Electronics guarantees performance of its semiconductor products to the original OEM specifications. “Typical” values are for reference purposes

only. Certain minimum or maximum ratings may be based on product characterization, design, simulation, or sample testing. Rochester Electronics reserves

the right to make changes without further notice to any specification herein.

Rochester Part Number

Fairchild Part Number

Package

Temperature

MM74HC123AN

MM74HC123AN

PDIP-16

-40° to +85°C

MM74HC123AM

MM74HC123AM

SOP-16, Plastic

-40° to +85°C

MM74HC123AMTC

MM74HC123AMTC

TSSOP-16, Plastic

-40° to +85°C

MM74HC123ASJ

MM74HC123ASJ

SOP-16, Plastic

-40° to +85°C

Rochester Ordering Guide

*Most products can also be offered as RoHS compliant, designated by a –G suffix. Please contact factory for more information.

Please contact factory for specific package availability

and Military/Aerospace specifications/availability.