Harold M Hallikainen wrote:

> >Harold Hallikainen wrote:
> >>
> >>Does anyone have experience on using ceramic resonators with
> >> built-in capacitors on the 16c74?  We're using a 16 MHz resonator
> >with the oscillator in the HS mode and find that about 1/3 of the
> >resonators don't oscillate.  Most resonator datasheets don't specify units to
> >work with the pic chips.


 Harold:

HP makes a network analyzer (E5100A) designed to measure reasonators and
crystals.
The result of this measurement is an equivalent circuit for the
reasonator or crystal.
Included in the equivalent circuit are resistors.  The PIC chips could
also be characterized for the negative resistance looking into the
oscillator pins.  Knowing
the -R of the PIC, a specifications could be made for the +R of the
reasonator.  Maybe
Microchip will specify there parts so that the reasonator could be
specified.

Have Fun,
Brooke