DM74LS221
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 This provides the input with excellent noise immunity Additionally an internal latching circuit at the input stage also provides a high immunity to VCC noise The clear (CLR) input can terminate the output pulse at a predetermined time independent of the timing ponents This (CLR) input also serves as a trigger input when it is pulsed with a low level pulse transition ( ) To obtain the best and trouble free operation from this device please read operating rules as well as the NSC one-shot application notes carefully and observe remendations
Features
Y A dual highly stable one-shot
Y pensated for...
