Hi Nathan,
The use of the PLL, is to improve problems wit noise and cross talking,
having such a large speed clock running around your board without causing
problems is not easy. The PLL allows the device to run at high speed, but
that high speed clock is only used internally by the the device in a way
that it as been optimized by the manufacturer.
So in short, you want to be using that PLL. :-)
Best Regards
                       Luis
On Jan 24, 2012 8:23 PM, "Nathan House" <nathanpiclist@gmail.com> wrote:

> When using a microcontroller that operates at a high clock speed, such
> as an 80MHz PIC32, is there an alternative to using a PLL? I don't see
> any 80MHz crystals on Digikey..
>
> Thanks,
>
> Nathan
>
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