I'm using a 74LVC14 to do that. 3.3V to it
and 5v to PIC.

Friendly Regards

Octavio Nogueira
===================================================
nogueira@propic2.com                  ICQ# 19841898
ProPic tools - low cost PIC programmer and emulator
http://www.propic2.com
===================================================

----- Original Message -----
From: David Duffy <piclist@AUDIOVISUALDEVICES.COM.AU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, May 17, 2000 4:18 AM
Subject: 5v PIC <> 3v3 logic


> Hi All,
> This is my 1st time using 3v3 devices (ISD5008 voice chip) and was
> wondering about the best way to interface the PIC to it. (5v supply)
> I could power the PIC from the same (3v3) rail but then I still need to
> interface to a MAX483 transceiver and possible other bits too.
> Any ideas on the best way (low cost/component count) to do this?
> I was thinking of a resistive divider for 5v output to 3v3 input?
> Maybe an NPN transistor & resistors as a level shifter up to 5v from 3v3 ?
> No matter which rail I put the PIC on, I still need the 5v rail for
MAX483.
> The interface between the PIC & the MAX483 uses less i/o but the
> transistor level shifter will invert the 485 RX/TX lines which I can't
have.
> Any suggestions appreciated.  :-)
> Regards...