Has anyone had difficulty with crystal start-up.
Currently we are having problems with a circuit that uses a PIC16C711-
201/P, 2 @ 22pF load caps and a 20 Mhz AT crystal. The configuration is for
fundamental operation.

We are using a high temp screen (85 deg C storage before functional check)
to try and weed out problems but have still found modules not functional at
the production plant.
Sleepy crystals have been discussed but we have experimented with three
different manufactures of crystals we have ruled this out.
One of our action items is to redesign and use 10 Mhz, but right now we
aren't sure of the root cause of failure so there really isn't a guarantee
that this plan will work.

What are some specific design parameters that could be measured to arrive
at the root cause?

Thanks,
Jason

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