On Tue, 2007-03-06 at 07:49 -0800, William Chops Westfield wrote:
> On Mar 6, 2007, at 1:38 AM, Alan B. Pearce wrote:
> 
> > So the data sheet is correct, and you are trying to
> > operate the chip outside the limits.
> 
> I dunno.  If the chip behavior has changed and the datasheet
> HASN'T changed, that seems like a microchip-side problem to me.

But you're talking about a change in behavior OUTSIDE of the specs.
That's like complaining that older parts could put a hole in the ceiling
when you powered them with 120V, and the new parts only give a puff of
smoke.

> The inability to adequately clamp inputs with ordinary silicon
> diodes seems like a pretty serious issue.  (Are you sure you
> saw that with chips that hadn't been subject to the internal
> diodes being used as clamps?  It's possible that THOSE chips
> were damaged somehow...)

But if you follow the specs the PIC should never see voltages on it's
pins outside of the Vdd-GND range, so why is this an issue?

TTYL

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