It depends on what the fallout is e.g., temperature, voltage, setup time,
hold time, etc. and what your application requires.

Don't forget that on a particularly good day everyhing is coming up 20 MHz
and if you order a 4 MHz part you will get a 20 MHz part marked as 4 MHz.

So the third factor would be luck.

Rich

At 01:25 AM 4/2/98 +0100, you wrote:
>I want code to run at 6Mhz, and have been using 10Mhz PICs OK.
>I am about to try 4Mhz PICs (cheaper!!) and try them at 6Mhz.
>
>Anyone been there before ????
>
>You used to be able to clock up 486 CPUs !
>
>Jim Stewart
>jims@kingswayscotland.demon.co.uk
>
>

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