Tristate Buffer Output if Input is High-Z?

[der Mouse]

> However, doing a bit more research, it looks like what I really need
> is a Transmission Gate.   The important difference is that a
> transmission gate will pass the input regardless of its state, so L
> passes L, H passes H and Z passes as Z.

Beware that for such a device, "input" and "output" are ill-defined;
what they really do is connect two pins together, without regard for
which is driving and which is being driven - as must be, if it is to
pass Z "correctly".

This may, of course, be no problem for you, but it should be kept in
mind when designing with them.

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