Shawn Ellis wrote:
>
> Ok, stupid question time..  Could someone please define for me once and for
> all the meaning of the "Schmitt Trigger" and how it differs from TTL?  Also
> the Schottkey, but I think this is just a low power TTL...
The schmitt trigger is simply a buffer or an inverter with hysteresis
at the input.A rising signal will trigger a change in output when the
voltage reaches say 66% but if the voltage then starts to decrease the
output will not change state until the voltage drops to say 33% this
difference in trigger levels is the hysteresis and is useful for
squaring
slowly rising signals and removing noise from signal lines which is why
it
is used for the data & clock pins on the 16c84 in programming mode for
instance.
        regards Tony M.
        just this guy ya know