DM74LS221SJX

单稳态多谐振荡器 Monostable Multivibrator

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