On Sat, 15 Mar 1997 11:02:49 -0800 Alex Bogdan <abogdan@PASSPORT.CA>
writes:
>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.
>>         Any ideas appreciated!
>>
>> Thanks!
>>
>> Harold
>
>
>Hi Harold:
>Just Yesterday I've tried muRata's CSA4.00MG011 ceramic resonator with
>PIC16C84-04p! I used two 680pF caps and two resistors (4.7k and 10k)
>as
>it suggested in the application note. Everything worked just fine. You
>should get muRata Piezo-Electric Devices catalog No. P-05-A. Very
>useful
>application notes are in there!
>Alex
>


        Thanks for the comments!  As I recall in the Microchip
Application Notes, they used a muRata resonator with external capacitors.
 I SHOULD review that a bit more closely now that I have the muRata
catalog.  Anyway, to save board space in a very small product, I've used
resonators with internal capacitors and no resistors.  It (of course)
worked in all the prototypes, but in production about 1/3 of the
resonators are not starting.  I was hoping someone has found a resonator
with capacitors that works reliably with no other components.  Maybe not!
        Again, thanks for the comments!

Harold