> -----Original Message-----
> From: Olin Lathrop [SMTP:olin_piclist@EMBEDINC.COM]
> Sent: Tuesday, April 15, 2003 3:39 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      [PIC]: 18F1320 warning
>
> I had a problem about a month ago with the new 18F1320.  Nice chip, but it
> acted flaky.  After a lot of experimenting and double checking, I found
> that it was flaky with 10MHz and 8MHz crystals and PLL, and worked fine
> with 20MHz crystal.
>
> I told Microchip what I'd found, and they sent me different samples with a
> different date code.  Those did the same thing.  I sent them the bad
> chips, a configured PICdem and some more info, and didn't hear anything
> for quite a while.
>
> Yesterday I got a phone call from my local Micrcochip FAE who said the
> engineer in Arizona was able to reproduce the problem.  They agree the
> 18F1320 doesn't run at speed, and they think all current versions of these
> parts are effected.  Oops.  It will be interesting to see how well they
> publisize a major fault that could seriously screw many people.
>
> I don't know which other chips are effected, but I certainly wouldn't
> trust a 18F1320 or 18F1220 with the PLL enabled.  For now, I'm going to
> consider these 20MHz parts.
>
>
The large program memory 18F series have suffered from these problems
already, with the maximum speed being reduced down to 25MHz. You'd have
thought MChip would have been extra carefull testing new products over the
whole clock frequency range after that.

Mike



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