Aaron, I just went through this the other day. You CAN use a series xtal -
the frequency may be off a bit. However, Digikey does sell parallel xtals -
I just ordered some from their on-line catalog.

The X439-ND is a 20 pf parallel xtal at 20 mHz
The X405-ND is a 20 pf parallel xtal at 4 mHz

See page 560 of their on-line catalog.


At 11:41 PM 1/19/2003 -0800, you wrote:
>I need to get some crystals for my pic chips, and wanted to know a
>little more about them.
>
>I'm going to get Crystals because of their higher accuracy, but there
>seems to be several types. What is load capacitance and how does it
>affect the PIC? On digikey they have several 4mhz and 20mhz crystals and
>I was going to get the:
>4Mhz Crystal X081-ND
>20Mhz Crystal X438-ND
>
>but those are both considered "series" and had no rating for load
>capacitance. I was just wondering if that mattered at all or not.
>
>Thanks
>Aaron
>
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Larry Bradley
Orleans (Ottawa), Ontario, CANADA

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