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DM74LS221

Fairchild Semiconductor
Part Number DM74LS221
Manufacturer Fairchild Semiconductor
Description Dual Non-Retriggerable One-Shot
Published Oct 9, 2005
Detailed Description DM74LS221 Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs August 1986 Revised April 2000 DM74LS22...
Datasheet PDF File DM74LS221 PDF File

DM74LS221
DM74LS221

Overview
DM74LS221 Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs August 1986 Revised April 2000 DM74LS221 Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs 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.
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 components.
This (CLR) input also serves as a trigger input when it is pulsed with a low level pulse transition ( ).
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