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

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