> At 10:07 AM 6/15/2007, Bob Blick wrote:
>>Following up on my post from yesterday that got no
>>resonses, I am assuming that everybody uses crystals
>>at 20MHz because they tried a resonator once and it
>>didn't work.
>
> Harold H has had good results with a particular brand of resonator at
> 20 MHz.  IIRC, ECS was not reliable but Murata was.  I'll have a look
> through my archive to see what I can find out.
>
> I don't do much at 20 MHz myself - projects with small (12c, 12f)
> parts use internal RC (sometimes with a 32 KHz crystal if I am doing
> time-keeping), most projects with larger PICs use a 4 MHz resonator.
>
> dwayne


Following up on this, ECS generally says if the resonator works with their
inverter based circuit, it's fine. muRata will, however, characterize a
resonator to your particular circuit. You send them a board, and they run
a bunch of tests and come back with a recommended part number. They also
have a "resonator finder" on their web site where you specify a chip and
it comes back with a part number. It doesn't cover every chip and does not
consider layout issues, but it's a start.

Harold

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