|  What this means is that there isn't *necessarily* any difference
|between a "4MHz" and a "10MHz" one.  Some people test them at higher
|clock speeds again and if they feel their testing is adequate to cover
|the likely conditions, proceed to use them at the higher speed.

Does the same apply for the low-voltage parts?  I was a bit impressed when
I tried cranking the voltage down on a 16F84-10 that was running at 32KHz
and was impressed (shocked, even) to observe that the PIC continued to RUN
at 1.2volts and kepts its memory contents even below a volt!  (Ramping the
voltage down and back up, it appeared that the PIC had "paused" at the low-
est voltages but resumed operation (without resetting) when the voltage was
again raised.

*THAT* is pretty impressive, IMHO... since current drops with voltage, I
wonder how long the PIC could run off a cap...