This comes up quite a bit.  The basic theory is that the dies is exactly
the same between chips.  The only difference is that either 1) It didn't
test up to 10MHz or 2) It was never tested past 4MHz.

Therefore you'll probably have few if any problems running it that fast,
however, temperature variations will affect it.  ie, don't make a
production run out of them, and don't have high expectations for them.

-Adam

Lea wrote:
>
> Hi!
> I was designing an application that requires 10 mhz with a 16F84, but here,
> in my country only can find the 16F84-4 that I believe it runs only at 4
> MHZ (max) , is possible to run the 16F84-4 at 10 Mhz?, or using it with an
> external oscilator?.
> I was using the 16F84-4 in the past at 6 Mhz clock (HS setting) without
> problem, but 10 Mhz may be too much.
>
> any idea?, 10 Mhz version of 16F84 is unreacheable here...
>
> thanks!
> PS:sorry for the bad spelling.
>
>    Leandro J. Laporta (LU2AOQ)
>    mail: lu2aoq@yahoo.com
>    wrk: Arg. Assoc. for Space Technology.
>    ham: TCP/IP high speed group HSG