tm

May 2007

©1993 Fairchild Semiconductor Corporation

www.fairchildsemi.com

74VHC123A Rev. 1.2

74VHC123A

Dual Retriggerable Monostable Multivibrator

Features

General Description

The VHC123A is an advanced high speed CMOS

Monostable Multivibrator fabricated with silicon gate

CMOS technology. It achieves the high speed operation

similar to equivalent Bipolar Schottky TTL while main-

taining the CMOS low power dissipation. Each multi-

vibrator 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 VHC123A can be

triggered on the positive transition of the clear while A is

held low and B is held high. The output pulse width is

determined by the equation: PW

= (R

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

An input protection circuit ensures that 0 to 7V can be

applied to the input pins without regard to the supply

voltage. This device can be used to interface 5V to 3V

systems and two supply systems such as battery back

up. This circuit prevents device destruction due to mis-

matched supply and input voltages.

Ordering Information

Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the

ordering number.

Order Number

Package

Number

Package Description

74VHC123AM

M16A

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

74VHC123ASJ

M16D

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

74VHC123AMTC

MTC16

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

Wide