Check out
http://www.chipcenter.com/embapps/e018fig1.htm;$sessionid$RNLARRYAABGHCQSNDI
SSFEQ for a simple voltage shifter.  Also you might want to check out
Amtel's dataflash memory, which is available in a MMC package, which has 5V
tolerant pins.

James Hyslop



-----Original Message-----
From: Peter L. Peres [mailto:plp@ACTCOM.CO.IL]
Sent: Monday, August 26, 2002 1:49 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: "5V tolerant" 3V buffer?


On Mon, 26 Aug 2002, Harold Hallikainen wrote:

>I need to convert a couple 5V logic lines out of a PIC running on 5V to
>3V levels to drive a MultiMedia card. I've seen some 3V PLDs that have
>"5V tolerant" inputs. Does anyone know of a simple buffer like that? One
>that I'd be able to power with my 3V supply, but drive the inputs with 0V
>and 5V?

If you do not use very fast outputs series resistors and fast zeners
(tranzorbs or the clamp circuit I showed with a small mod) are all you
need. 3V Voh from the MMC is within the permissible range for Vih on PIC
inputs (unless it is a schmitt input).

Peter


**********************************************************************
This email and any files transmitted with it are confidential and
intended solely for the use of the individual or entity to whom they
are addressed. If you have received this email in error please notify
the sender immediately.

This footnote also confirms that this email message has been swept by
MIMEsweeper and Symantec Norton AntiVirus for the presence
of computer viruses.
**********************************************************************

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics