>>         I've had great luck with 16 MHz ceramic resonators with built-in
>> capacitors from muRata.  I'm using them on a 16c74a.  We've probably
>> shipped a thousand units now with absolutely no problem.  I did find that
>> the resonators from Integrity Technology and ECS do not seem to work
>> reliably with the PIC (at least the ones with internal capacitors).  They
>> may work fine at lower frequencies or with other chips.
>
>I've found the DigiKey resonators (ECS I think) to work great at 4MHz and
>10MHz and not at all at 20MHz.  Haven't tried other frequencies; any idea
>what the problem at 20MHz is?

The problem with the "A" parts (ie 73A) is that the ECS resonators with
built in caps have too much internal capacitance (30 pF+).  I have been able
to get 20 MHz ECS CAPLESS resonators to work with a 73A running up to 20 MHz.

myke

"I was well aware that the processes of puberty are often fatal to psychic
power."
- Sir Arthur Conan Doyle