> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Allen Wayne
> Sent: Tuesday, March 09, 2004 11:02 AM
> Hi All,
>
> I have to drive a schmitt CMOS input on a device from a PIC. Cmos
> device is
> running at 9V, pic 5V Any ideas as to what sort of protection/filtering I
> need to put on the input ?
>
> Wayne

The easiest way is to use a CMOS level shifter chip, e.g. 4504.

Paul

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