I want to take a group of 3.3V logic signals, buffer them and output=20
them as either 3.3V or 5V logic signals at the board users selection.

I first thought of using a normal logic chip but I can't seem to find a=20
family that has 3.3V compatible inputs when running off 5V and is=20
specced to run off 3.3V and I'd rather users didn't have to swap chips=20
to change the output voltage.

I found a chip from TI that can do such conversions, the SN74LVCC3245=20
but it seems to have painful power up requirements (according to Ti Vcca=20
must come up BEFORE vccb). I guess I could put in a RC circuit or=20
something to slow down the coming up of Vccb but it seems a messy soloution=
..

Any thoughts/advice on this.
--=20
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