---- Original message ----
>Date: Thu, 19 Sep 2002 14:52:44 -0400
>From: Olin Lathrop <olin_piclist@EMBEDINC.COM>
>Subject: Re: [PIC]: Maximum frequency specs for pic inputs
>To: PICLIST@MITVMA.MIT.EDU
>
>> I think that the 16Cxx parts were pushed to 50MHz + ,
>> but can the Flash parts perform as well ? Where can I
>> find this kind of information ? Not the datasheet ...
>
>Um, why not?  I'm pretty sure there is a max timer 1 input
frequency spec in
>there somewhere.

See below.

>> Electrical specifications are not entirely clear .
>
>What part of "maximum frequency = xxx" is unclear?  Try
asking a more
>specific question.

The specs is clear, but meaningless in this context.  How
was the spec determined?  What is the reliability of a part
at that frequency?  What is the reliability at 25% above
that frequency?  What is the failure mode if pushed too fast?

>> And (  ;-)  ) I don't want exactly the manufacturer's
>> spec's ; I want to know what can I push for in the real
>> world ?
>
>Let's not waste time on this nonsense.

How is that nonsense?  We all know that parts are
consistenly under- or over-spec'ed by the manufacturer.
Sometimes the data sheet gives wildly
optimistic "information", while other times the "absolute
maximum ratings" are far below the real limits.  You can
guarantee that a PIC spec'ed for 20MHz max will work at 21.
It might even work fine at 25, 30, or more.  At some point,
it will become unreliable.  He wants speed vs. reliability
information for clock speeds beyond those Microchip designed
for.
--
Mike P.
MTP Technologies
KC0LLX

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