> And yes, Microchip does recommend variable Vdd for verification of some
> parts.  They make a point of distinguishing between "prototype" and
> "production" programmers, with the latter verifying at the Vdd limits.

Does anyone have any actual data about how many parts verify at nominal 
voltage, but fail verification at the limits?

It seems to me that the value of verification at Vdd extremes would be 
directly related to such statistical information.

Then it begs to ask the question, what do you do if it fails verification at one 
of the Vdd extremes? Reprogram? Discard?
 
-Denny


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