prolong the incoming pulse duration with some electronics solution

[falcon026]

i have an input signal which goes active state (high or low) for 1usec and remain idle state (low or high) for the rest of the time ...
i want to put a delay in its active 1usec pulse . such that output has 2usec active state . i dont want to use microcontroller here , just want to achieve this with some electronics circuit. Please guide?

(the final output will be used as interrupt to 8052 controller... it sometimes miss 1usec input pulse , hence want to add some delay)

 

[srizbf]

if you want to have an output 2usec pulse on each incoming 1usec pusle , insert a monostable multivibrator and use the 1usec to trigger it.
(a 555 or 74121 will do).

 

[KlausST]

Hi,

(high or low) .... (low or high)

You first need to define which us which.

If you delay both you gain nothing.

Klaus

 

[BradtheRad]

It sounds as though you wish to store an upward-going pulse, correct?
It can be done with a one-shot, or an SR flip-flop, or a DCR network.
DCR stands for diode-capacitor-resistor, configured to charge the capacitor quickly when a pulse arrives, then discharge slowly through the resistor.

 

[falcon026]

@srizf thank you dear ... actually for each incoming low pulse of 1usec, it has to generate only one low pulse of 2usec duration

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@KlausST @BradTheRad thanks dear actually a low pulse of 1us is being sent to external interrupt of 8052 (active low interrupt configured), sometime it triggers interrupt but sometime it misses, so i wanted to prolong the low pulse duration for 2usec, i hv simulated DCR in proteus but it was not extending the duration of pulse. anything specific or guideline while using this network ?

 

[KlausST]

Hi,

show your proteus circuit.

Klaus