Mark Chauvin wrote:
>> What type of environment is it used in ?
>
> Automotive scan tool

That sounds like it's regularly subjected to shock and vibration.  Crystals
hate that.  The simplest answer is to use a ceramic resonator if you can
live with the lower frequency accuracy.  Resonators are more rugged
mechanically.

> Can I assume in the crystal mfg's literature that "Load capacitance"
> specifies the recommended values for c1 & c2?

No.  But your 33pF caps are definitely too high.  That by itself would
probably not damage the crystal, but it might be oscillation close to the
edge.  Small changes could make knock the loop gain just below 1 so that it
doesn't oscillate anymore.


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