DM74LS221N Datasheet PDF - Fairchild

●General Description

●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 allows jitter free triggering for inputs with transition rates as slow as 1 volt/second.

●Features

●■A dual, highly stable one-shot

●■Compensated for VCCand temperature variations

●■Pin-out identical to DM74LS123 (Note 1)

●■Output pulse width range from 30 ns to 70 seconds

●■Hysteresis provided at (B) input for added noise immunity

●■Direct reset terminates output pulse

●■Triggerable from CLEAR input

●■DTL, TTL compatible

●■Input clamp diodes