In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

I believe SAW oscillators have the lowest PPM tolerances, problem is most are in the 100's of megahertz (224.5MHz is the lowest I found on digikey), but you may be able to couple it with a frequency divider chip to step the frequency down to a usable value.

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