MM74HC123A

MM74HC123A Dual Retriggerable Monostable Multivibrator

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MM74HC123A Dual Retriggerable Monostable Multivibrator

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 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 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 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 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 output 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: 25 ns s Wide power supply range: 2V 6V s Low quiescent current: 80 A maximum (74HC Series) s Low input current: 1 A 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 rise and fall times to be as slow as one second

Ordering Code:
Order Number MM74HC123AM MM74HC123ASJ MM74HC123AMTC MM74HC123AN Package Number M16A M16D MTC16 N16E Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide 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 Diagram

Timing Component

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

Top View

2001 Fairchild Semiconductor Corporation

DS005206

www.fairchildsemi.com