There has been quite a discussion on ceramic resonators over the
past year.  My experience is that those from muRata with built in
capacitors work well with a 16c74a operating at 16 MHz.  The similar
units from Integrity Technology and ECS do not work reliably with this
chip at this frequency.  I had extensive conversations with all three
companies and with Microchip.  Microchip does not characterise the
oscillator circuit, so we are on our own to come up with a working
resonator (though they do list some muRata parts with external capacitors
in their databook).  Integrity and ECS say their parts work with a CMOS
inverter, so they are fine.  There appears to be no attempt by either of
these companies to make the devices work with the Microchip parts.  When
I spoke with muRata, they had received chips from Microchip and were
running tests on their resonators.  I did not wait for the test results,
but went with the standard muRata 16 MHz device with built in capacitors.
 We'e now shipped at least 1,000 units with no problems.

Harold

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