74LS221 Datasheet (Fairchild Semiconductor) - Dual Non-Retriggerable One-Shot

74LS221, Dual Non-Retriggerable One-Shot

The DM74LS221 is a dual monostable multivibrator with Schmitt-trigger input.

Each device has three inputs permitting the choice of either leading-edge or trailing-edge triggering.

Pin (A) is an active-LOW trigger transition input and pin (B) is an active-HIGH transition Schmitt-trigger input that al

74LS221 Features

* s A dual, highly stable one-shot s Compensated for VCC and temperature variations s Pin-out identical to DM74LS123 (Note 1) s Output pulse width range from 30 ns to 70 seconds s Hysteresis provided at (B) input for added noise immunity s Direct reset terminates output pulse s Triggerable from CLEAR