> The dynam al capacitance is a couple of fF, and thus R1 is between 10k to 80k
> depending on the size
A friend of mine has been fighting a 32 kHz clock problem on an ARM processor
(used to wake up from periodic sleeps). In discussions with the CPU and
crystal makers it looks like some of the modern tiny (2mm or less) clock
crystals have a resistance in the 250K range. Load caps need to be in the 2-4
pF range. The oscillators are running in the nano-amp/watt region and can be
VERY picky about what it takes to make them work reliably. Plus clock jitter
tends to be in the mega-horrible range. And don't get him started about the
wonders of 01005 sized SMT passives...
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