The MM74HC123AN 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 MM74HC123AN can be triggered on the positive transition of the clear while A is held low and B is held high. The MM74HC123AN 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: PWe(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.
Typical propagation delay: 25 ns
Wide power supply range: 2V±6V
Low quiescent current: 80 mA maximum
Low input current: 1 mA 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 and fall times
Datasheet Available:National MM74HC123AN
16 pin DIP. Manufactured by National.