74HC221 IC – (SMD Package) – Dual Non-Retriggerable Monostable Multivibrator with Reset IC (74221 IC)

The 74HC221A 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 74HC221A can be triggered on the positive transition of the clear while A is held LOW and B is held HIGH. The 74HC221A is a non-retriggerable, and therefore cannot be retriggered until the output pulse times out. 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:-

? Typical propagation delay: 40 ns 

? Wide power supply range: 2V?6V 

? Low quiescent current: 80 ?A maximum (74HC Series) 

? Low input current: 1 ?A 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 enable infinite signal input rise or fall times

Specification:-

Related Document:- 

 74HC221 SMD Data Sheet