> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Peter P.
> Sent: 07 January 2008 16:06
> To: piclist@mit.edu
> Subject: Re: [EE] CMOS and Latent ESD Damage
> 
> unpredictable. I recently saw a simple design that involved a pic and
had
> a
> total (and critical) parts cost of under $2 that had to have two
costly
> Schottky
> diodes added (normal diodes would not do!) after the pcbs were
designed
> and
> manufactured to prevent a current injection related malfunction that
did
> not
> occur with any previous series of chips. That was a 10-15% parts cost
> increase,
> manual labor and ugliness of piggybacked parts not accounted for.
There
> was not
> even a suffix change between the parts that needed the mod and those
which
> did
> not.

Was the device being used outside of the specifications originally
though?  Lots of history on the list to suggest the injecting any amount
of current into PIC pins is a bad idea and not within the operational
spec.

Mike

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