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"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.
 

Yes, thes usual name for it is retriggerable monoflop. Standard 74123 (e.g. 74HC123) is implementing the requested behaviour.
 

Thanks for the answer.

Do you know how it is implementated? Can you send me a link or describe the circuit?

Thanks, Aviad.
 

You can find internal circuits in some manufacturer datasheets, e.g. TI CD54HC4538 www.ti.com.
 

    aviaden

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