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Easiest way to design this circuit?

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david90

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What is the easiest way to design a circuit that output 5V for .5sec when it sees the start of a serial data transmission? When the output is on (5V), any serial signal must be ignored until the .5 sec timeout.

Thank for your help
 

how current?
if A logical circuit use can use 74123 or 555 munoastable with external triger.
 

The easiest way would be using a monostable circuit with pulse width of 0.5 sec and ANDing its inverted output with the data stream .Yet, monostable circuits wouldn't be very accurate at the pulse width .If you need higher accuracy, you would try going for a ucontroller with the data connected at the interrupt pin and an input pin .When data xmission starts, the interrupt will be triggered that would initiate a counter that would count N times where N*Tclock=0.5 sec during which data isn't allowed to propagate to output then after the .5 sec, data is echoed from input to output .
 

Can the 555 in one shot mode be configured to look for positive edge instead of negative?
 

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