Not with a pic but a while back I lost a plugblock 6809 system by dumping
12v on VCC.

Most devices were destroyed but the EEPROM I was using for program storage
survived.

I've a theory that programmable devices are usually (or often or just
sometimes) made so all the chip is capable of running off it's programming
voltage at least if not higher. Result: 12V VPP EPROM parts might withstand
a VCC of 12V, for a while.



----- Original Message -----
From: "Philip Pemberton" <philpem@DSL.PIPEX.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: 16 April 2003 11:22
Subject: [PIC]: The Amazing Indestructable PIC!


> Hi all,
> I've just finished testing my new PIC programmer (yes, the breadboarded
test
> model works) and my switchmode PSU just died. Not dead as in no output,
but
> dead as in 20V straight over the 5V output. Unbelievably, the PIC16F628
that
> was connected to the output of said PSU is still working!
> It looks like the PIC's ESD protection kicked in and protected it. Well,
> that's the best explanation I've got ATM. The 7407 buffer and MAX662
voltage
> booster seem to be fine, too. Has anyone ever had a similar experience
with
> a PIC?
>
> Don't worry, I've learned my lesson... Don't trust the PSU unless it's
fitted
> with a crowbar circuit... Now where's that 7805...
>
> Later.
> --
> Phil.
> philpem@dsl.pipex.com
> http://www.philpem.dsl.pipex.com/
>
> --
> http://www.piclist.com hint: To leave the PICList
> mailto:piclist-unsubscribe-request@mitvma.mit.edu
>

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