Brandon Tarr wrote...

>Try these Digi-Key p/n's:
>
>Surface mount 40MHz resonators
>PX400CTR-ND
>PX400JCT-ND
>PX400JTR-ND
>PX400CCT-ND
>
>Or, if you don't like surface mount and don't mind spending a little extra,
>do what I do and get yourself a 40MHz crystal oscillator.  They are 1 part,
>3 connections, can be a clock source for multiple chips (especially when you
>include a buffer) and provide a very robust temperature stable clock signal.

Note that while the data sheet lists the maximum input clock
frequency from an external oscillator in the EC and ECIO modes as
40 MHz, the maximum frequency for a crystal or resonator in the
HS mode is only 25 MHz.  The PIC's on-chip oscillator may work at
frequencies higher than that, it isn't guaranteed to.

For a hobby project, using a 40 MHz resonator might work; but if
you're trying to make a manufacturable product, it's not a good
idea.

Dave D.

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