Ok, that would be my first thought also. This also seems like the least
work, as I need to convert only about 5 lines, as opposed to the 24 5V
signals I had otherwise to convert.

But now, how do I convert the
voltages down in an efficient way? I don't like the idea of putting zeners
/w resistors on the outputs, since in that way I lose my low-impedance
output of the pic.
Did I mention I also have to drive an i2c-bus also at 3.3v? Now how do I go
about that? I'm no i2c expert at all, so this is one part I for sure won't
find an answer to myself easily.

<sigh>
Why don't all devices just run at 5V :-)

Hans
On Wed, Jul 05, 2000 at 11:26:48PM +0200, Quentin wrote:
> IMO, since your PIC is the main part here (comm with PC and LCD at 5V),
> I would say run it at 5V and convert down.The PIC will also still read a
> 3.3V input as Logic High.
>
> Quentin
>
> "H.P. de Vries" wrote:
> >
> > Hi.
> >
> > Does anyone in here know how to interface 3.3V logic to 5V logic? I have a
> > PIC and some other stuff running at 3.3V , but need to interface with the
> > ATA-interface from my PC, and a LCD-display, which both need 5V logic
> > levels. Is there an easy way to do this? Or is it easier to run the PIC at
> > 5V, and then convert the signals down to 3.3V?
> > Or is it possible (yes, I say possible, not allowed) to just put it all
> > together and operate the 5V logic devices at 3.3V ?
> >
> > Hans
> >
> > --
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>
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