The model I used on my current project is surface mount, but its  
DigiKey number is 300-7223-1-ND

That hopefully should get you on the right track.

-n.


On Dec 10, 2006, at 10:22 PM, Adam stambler wrote:

> Thanks for all the help.  After struggling with the circuit for  
> several
> hours I tried swapping out the ceramic resonator got a new ceramic  
> resonator
> and tried it.  Magically, it worked...
>
> I am not sure quite sure why that worked, but it could be as simple  
> as the
> fact that that resonator was bad or the solder joints were fouled  
> up.  With
> something so cheap I should really keep extras on hand to swap during
> trouble shooting.
>
> Anyway, thanks again for the suggestions.  I am just in high school  
> and
> trying to learn electronics.  Often just reading through this  
> weblist has
> been more educational than any of my classes and your responses  
> have been
> really informative.
>
> For example, I haven't come across this "powered clock" before.   
> Digikey and
> Google dont seem to show anything with my search terms.  Anyone  
> have  a part
> number or link to a datasheet?  I originally chose a ceramic  
> resonator for
> my design because I read they were more robust than crystals and I  
> wanted
> this to go inside a model rocket. Since the ceramic resonator  is   
> working,
> I will keep it for this version, but maybe for another revision or  
> other
> project this powered clock would be better.
>
> Regards,
> Adam
>
>
>
> On 12/10/06, James Nick Sears < jnsears@jamesnsears.com> wrote:
>>
>> For a dollar or two, you can be free of all of these issues with a
>> little powered clock.  Four pins, Vdd, GND, CLKOUT, and something
>> else (probably an enable-like function) and you are good to go.
>> 40MHz, no problem.  Just set your clock config flag to EC (external
>> clock).  Available in through-hole or SMT (actually the surface mount
>> version is smaller or at least similar to the SMT crystals I used to
>> use).
>>
>> I've spent way too much time already in my young life fighting with
>> crystal oscillator circuits.  Anything of mine in the future that
>> isn't intended for mass mass production (and maybe stuff that does)
>> will have a powered clock, unless there is some reason not to that
>> I'm not aware of.
>>
>> -n.
>>
>>
>> On Dec 10, 2006, at 8:11 PM, Bob Axtell wrote:
>>
>>> Adam stambler wrote:
>>>> Hi, I was wondering if anyone could provide some oscillator
>>>> guidance.  I am
>>>> trying to run a 16f690 off a 20 mgherz ceramic resonator with
>>>> built in
>>>> capacitors.
>>>>
>>>> I think i have all my my programming correct, but when I go to
>>>> turn it on,
>>>> it does not work.  The oscillator does not start up.  However, if
>>>> I try to
>>>> measure the voltage with my multimeter and touch the Clock input
>>>> pin, the
>>>> PIC starts to work.  There is about 2.3V on the clock output and
>>>> input pin
>>>> .
>>>>
>>>> Right now i have a 1 mega Ohm resistor across the input and output
>>>> leads of
>>>> the resonator like the datasheet said for it to have. I am running
>>>> the
>>>> resonator in HS mode.
>>>>
>>>> My guess is that my programming is correct but there is not enough
>>>> drive to
>>>> get the oscillator going.  Unfortunately, I have no idea about how
>>>> to fix
>>>> the problem.  This is my first oscillator circuit which I am using
>>>> for a
>>>> school project.
>>>>
>>>> Anyone have any ideas?
>>>>
>>>> Thanks,
>>>> Adam Stambler
>>>>
>>> I have never been able to get reliable startups with the 20M seramic
>>> resonators. The fastest reliable speed
>>> for me was 16M. And I love these critters dearly.
>>>
>>> I believe the phase-shifting caps do not quite match the Microchip
>>> oscillator. Drop back to a lower speed
>>> or tinker with cap values. Incidentally, the ones by Murata may run
>>> at a
>>> slightly faster rate.
>>>
>>> --Bob
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