On Sat, 28 Jul 2007 21:08:09 -0400, Broderick Crawford wrote:

What't the difference between a retriggerable one shot and a regular
relay? Isn't that the same thing?

The basic one-shot will ignore a trigger pulse that arrives during its
'on' period. A retriggerable one-shot will stay 'on' for as long as
triggers arrive before the circuit reverts to the 'off' state. One of the
uses of the retriggerable version is as a watchdog timer, to raise an
alarm if an expected event doesn't happen on time.