Hi,

For me a similarly defective devices still a beliveble ESD.
Just think about lightning it will goes wherever the shortest and
easiest discharge path goes. My opinion is same with ESD.
If  the devices has one pin which can damaged by 1000V (because
of the chip layout) and rest of them only will damaged by 5000V
my understanding is all the time the 1000V pin will destroyed.
Altough I never did any tests in that matter, chips are to expensive
for that kind of game. Easier to follow some safety precaution.
Since I follow some basic rules I do not have any bad device.

Peter

Caisson wrote:

> > Van: Peter Schultz <schupet@dvp.com>
> > Aan: PICLIST@MITVMA.MIT.EDU
> > Onderwerp: Re: Un-erasable memory in a 16C74A
> > Datum: donderdag 12 maart 1998 0:36
> >
> > Hi
> >
> > It is definetely not the PicStart+.
> > It caused by ESD damage.
>
> It crossed my mind too, but ESD could not explain the fact that _TWO_ Pic's
> developed an equal problem at the (for me) same moment.
>
> Oh, before I forget to mention it, I've programmed 16C77 Pic's with the
> same
> PicStart+ and all things went O.K.  No problems.
>
> So, I can cancel-out ESD damage to my Pic's and PicStart+ (unless its
> intermittent ofcourse).
>
> > Altough so many people in the PicList does not believe
> > ESD can cause that type of damage.
>
> Once fried a C64 disk-drive controller because of it, just when I remedied
> the
> problem it had.  Was not funny.  But a great example of ESD and
> unforgettable.
>
> > Peter
> >
> Greetz,
>   Rudy Wieser