Rev.2.00, Oct 11, 2005 page 1 of 8

HD74HC123A

Dual Retriggerable Monostable Multivibrators (with Clear)

REJ03D0564-0200

(Previous ADE-205-438)

Rev.2.00

Oct 11, 2005

Description

This multivibrator features both a negative, A, and a positive, 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 HD74HC123A can be

triggered on the positive transition of the clear while A is held low and B is held high.

The HD74HC123A 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. The output pulse equation is simply: tw = (Rext) (Cext).

Features

• High Speed Operation

• High Output Current: Fanout of 10 LSTTL Loads

• Wide Operating Voltage: V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current

• Ordering Information

Part Name

Package Type

Package Code

(Previous Code)

Package

Abbreviation

Taping Abbreviation

(Quantity)

HD74HC123AP

DILP-16 pin

PRDP0016AE-B

(DP-16FV)

P

—

HD74HC123AFPEL

SOP-16 pin (JEITA)

PRSP0016DH-B

(FP-16DAV)

FP

EL (2,000 pcs/reel)

Note:

Please consult the sales office for the above package availability.

Function Table

Inputs

Outputs

Clear

A

B

Q

Q

L

X

X

L

H

X

H

X

L

H

X

X

L

L

H

H

L

H

H

L

H

Note:

External timing capacitance connects between Cext and Rext/Cext.

H :

High level

L :

Low level

X :

Irrelevant