For some reason, this query did not make it through the first time I posted it:

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My product must run at low voltages, so I need to use the "L" version of the
16F84.  Based on the graph in figure 12-12 (page 88) in the 16LC84 data book
(only ref available);  to conserve power, but still have decent throughput,
3.58 Mhz in XT mode seemed a good compromize.

Testing showed that all the prototypes functioned quite satisfactorily.

However, yesterday I got the new 16LF84 databook, and was horrified that
table 13.11 (page 86) says the max operating frequency is 2 Mhz in XT mode.
It is unclear from the rest of the book whether the 2 Mhz is a hard limit
for reliable XT oscillator operation, or if the limit is simply given under
the constaints of the power consumption quoted in table 13.11.  True to
form, the 16LF84's electrical specs are very incomplete, and those which do
appear are still labelled "Preliminary", so I am unable to read between the
lines.

So, here's the question: has anyone any experience, good or bad in running
the "L" series products in XT mode above 2 Mhz?

Many thanks,
... Gregg
CIBN Technologies Inc.,
Ottawa, Ontario, Canada.
grkricor@ccs.carleton.ca