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PICList Thread
'16C84@ 11.0592Mhz'
1997\03\25@124304 by Clewer,Brian

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Elvin wrote...

>Hi,
>Has anyone any comments/experience on running a 16C84 @ 11.0592MHz.
>I know it is 1.0592Mhz faster than the rating, but what I'm thinking
>about is sharing the clock on a circuit which already has an Atmel
>89C2051 running @ 11.0592MHz with a '84. I could divide the clock,
>but what I'd like is to run the '84 as fast as possible.
>Alternatley if someone has a suggestion of how to slow the clock
>for the PIC.
>
>Regards.Elvin


As far as I know, If your PIC runs at the faster speed, you 'probably' will
not have any trouble with the circuit.  The PICs are only guarenteed to work
at these frequecies because that is all they have been tested too.  I would
expect that there is not alot of difference between the 4 and 10 Mhz chips,
but the ones guarenteed to work at 4 have failed the tests at 10Mhz?  This
is not a good idea for production for obvious reasons.

1997\03\25@153613 by Mike

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>As far as I know, If your PIC runs at the faster speed, you 'probably' will
>not have any trouble with the circuit.  The PICs are only guarenteed to work
>at these frequecies because that is all they have been tested too.  I would
>expect that there is not alot of difference between the 4 and 10 Mhz chips,
>but the ones guarenteed to work at 4 have failed the tests at 10Mhz?  This
>is not a good idea for production for obvious reasons.


They might be more reliable (in the short term) at a slightly higher voltage
like 5.5v - but long term could fail with no warning.

CMOS devices tend to have a linear speed/voltage relationship.

If you want to run at lower voltage say 3.3 and devices are at max at 5v
and 4Mhz - I would say its a waste of time sampling for 10Mhz at less than 5v.

Rghds


Mike

Some say there is no magic but, all things begin with thought then it becomes
academic, then some poor slob works out a practical way to implement all that
theory, this is called Engineering - for most people another form of magic.
                                                                      Massen

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