How about

0. Test at 4 MHz
1. Mark as 4 MHz part or bin it.
2. Sell it.

Unless, if short of 20MHz part, then test at 20MHz. If pass, mark
accordingly

----- Original Message -----
From: "Dwayne Reid" <dwayner@PLANET.EON.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, November 06, 2000 4:50 PM
Subject: Re: [PIC]: 16F84A - 4MHz or 20MHz?


> At 12:08 AM 11/7/00 +1100, Roman Black wrote:
>
> >But don't you want to KNOW?? I have bought a number of -10P and
> >-4P PICs, and I really would like to know if I got what I paid for
> >or if I got something else.
> >
> >I don't want to run a 4MHz chip at 20MHz. But if I bought 4MHz chips
> >that are actually 20MHz chips I would like to KNOW. :o)
> >-Roman
>
> Actually, I think that you are looking at it backwards.  I'm pretty sure
> that testing goes something like this:
>
> Test to 20 MHz - those that r l , mark as such.
> Test to 4 MHz - those that pass, mark as such.
> Toss the rest.
>
> When they have more than enough 20 MHz parts sitting in inventory, skip
> step #1 above.
>
> So you have 2 possible choices: your 4 MHz parts either failed 20 MHz
> testing in some fashion *or* your 4 MHz parts were never tested above 4
MHz.
>
> My understanding from speaking with the FAEs is that they sell far more 4
> MHz parts than 20 MHz parts and that the majority of 4 MHz parts might
well
> work at speeds faster than what is stamped on the package.  But you would
> never find me shipping product that contains an over-clocked PIC.
>
> Maybe I'm weird, but I tend to purchase the fastest parts available for
> development work and prototypes and re-use those parts over and over
> again.  Its money well spent.  If I need to go fast, I can and do.  But
> once I get the project to the final stages, I try to re-work things so
that
> a 4 MHz part works.  I can think of only 2 projects that I've been
involved
> with that needed to ship with fast parts - everything else uses 4 MHz
parts.
>
> dwayne
>
>
>
>
>
> Dwayne Reid   <dwayner@planet.eon.net>
> Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
> (780) 489-3199 voice          (780) 487-6397 fax
>
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