monostable mode timer 555

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yassin.kraouch

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Hi, i want to configure thiis timer https://www.fairchildsemi.com/ds/LM/LM555.pdf
in a monostable configuration, when a trigger pin is lower than 1/3 the output is high, and when a new pulse applied after a short time, the output remains high ( a time is added),
many thanks
 

Page 4 of the data sheet shows this operation.

Enjoy your design work!
 

HTA said:
Page 4 of the data sheet shows this operation.

Enjoy your design work!
Click to expand...
no in the datsheet it is written : if you trigger again the Trig pin when the output is high you will not extend the output time,
 

It is retriggerable. The external component needs to be calculated based on your need(T= Rx * Cx).

Enjoy your design work!
 

what do you recommend. the retriggebae IC with 16 pin or using the 555 with external components ?
 

It is your decision. I personally would take a retriggerable monoflop since it is designed for that.

Enjoy your design work!
 

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