"One shot" monostable

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aviaden

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Hi,
I need to implement a special Monostable "One shot".
When the circuit is trigged, the circuit needs to switch to high instable state for a certain time-"high time" and then switch to low voltage.
If there was another trigger while the circuit was at a high instable state the then the "high time" should start from the beginning.

for example if "high time" is 60 micro seconds, and it was trigged at t=0 and then trigged again at t=20 microsec, the output should be high from t=0 to t=80 microsec, and then go down.

I would appreciate any ideas.
Thanks, Aviad.
 

This exist and is called
"retriggerable monostable"

see google, 74HC123 ...
 

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