Truncated match.
PICList
Thread
'Question 11 Mhz'
1999\01\13@190324
by
ose Antonio Gracia Negre
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Thanks
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1999\01\13@194317
by
NCS Products
At 12:49 AM 1/14/99 +0100, Jose Antonio Gracia Negre wrote:
>Knows that it happens when pic of 10 Mhz is made him work to 11,0592 Mhz?
Smoke? Fire?
No, really, nothing bad will happen. I've run
16F84-10's (10 mHz) at 16mHz without incident.
1999\01\13@222521
by
Sarunas Cepulis
Jose Antonio Gracia Negre wrote:
>
> Knows that it happens when pic of 10 Mhz is made him work to 11,0592 Mhz?
>
> Thanks
Hi,
I don't try 10 on 11.0592 , but I think all be O.K.
Because I have 4Mhz pic16c/f84 working on 8Mhz without problems.
Off course I don't test it in all temperature and Vcc ranges.
But with 5V Vcc and room temperature all works 100%.
B.R.,
Saras.
1999\01\14@011053
by
Eric Borcherding
Jose,
I used to run the PIC16C77s at 24MHz for increasing the A/D performance
worked on 99% of the ICs up to 65C.
Eric
1999\01\14@011506
by
Tomas Kapostas
Nothing, PIC work :-)))))))))
I overclocked a 4MHz 16F84 to 11,0592MHz and it's working too!!
TOM.
{Quote hidden}
1999\01\14@021116
by
g.daniel.invent.design
Hi Eric,
was it faster conversion time that you needed ?
any sucess with higher overclocking rates ?
sounds useful to me too...
regards,
Graham Daniel.
Eric Borcherding wrote:
>
> Jose,
>
> I used to run the PIC16C77s at 24MHz for increasing the A/D performance
> worked on 99% of the ICs up to 65C.
>
> Eric
--
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internal combustion engine would require recovery of waste heat by
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1999\01\14@093042
by
Glenville T. Sawyer
About the only problem likely with "overclocking" ( if you are using Serial
I/O routines)
is that the data rates could be incorrect, otherwise - they seem to work
very well !
Glenville T. Sawyer.
1999\01\14@125405
by
Yura Galayda
In previous message, Tomas Kapostas said:
> Nothing, PIC work :-)))))))))
> I overclocked a 4MHz 16F84 to 11,0592MHz and it's working too!!
> TOM.
I overclocked a 4MHz 16F84 to 16MHz and 20 Mhz also work ;-)
> > Knows that it happens when pic of 10 Mhz is made him work to 11,0592 Mhz?
> > Thanks
> > <<Soubor: Tarjeta de Jose Antonio Gracia Negre>>
>
--
------------
Yuri Galayda at SIC Vector R&D Department yura
KILLspamvector.kharkov.ua
PGP public key available -- finger .....yuraKILLspam.....vector.kharkov.ua | pgp -kaf
1999\01\14@152316
by
uter van ooijen / floortje hanneman
Most probably it will just work,
but you'll have a higher chance of failures
especially at the extremes of for instance
the temperature and power supply range.
regards,
Wouter
----------
{Quote hidden}
1999\01\14@185610
by
John Payson
|
|Knows that it happens when pic of 10 Mhz is made him work to 11,0592 Mhz?
The fastest speed at which a CPU will function properly is
determined by the following factors (in no particular order)
[1] Operating temperature (even setting aside the question of device
meltdown): the internal mosfets become less effective at higher
temperatures.
[2] Operating voltage: increasing voltage this has three main
effects, one of which is favorable; different effects dominate
at different voltages. The effects are: [1] Increasing VDD will
increase the amount of charge which needs to be moved to switch
a gate; [2] increasing VDD will, to a point, improve the current-
carrying capacity of gates; [3] increasing VDD will increase the
amount of heat generated in the chip, which will in turn increase
its temperature.
[3] Quality of oscillator: The internal oscillators on PICs are
often a weak link when trying to go over 20MHz. Using an external
oscillator will overcome this limitation.
[4] Process variation: In any given lot, some chips will be able to
run reliably at faster speeds than others.
[5] Quality of programming: A part whose program/erase margins are
marginal may misread its code if run too quickly. There's no
real way to control this factor on the 16x84's, but on the EPROM
parts, starting with a thoroughly blank chip and using good prog-
ramming margins is recommended if you're going to be overclocking.
Since Microchip warrants its parts to run at the rated speeds through
all variations in the above parameters, operating the parts under
particularly favorable conditions will allow the operating speed to
be increased beyond rated specification.
Some people on this list have reported running 16C54's at 50Mhz with
an external oscillator at 5.0 volts and moderate ambient temperature;
the highest overclocking I've ever done personally was a 16C84-10 at
11.0592MHz. But if you bear the above considerations in mind you may
have luck at faster speeds.
1999\01\14@192114
by
Mike Keitz
|
On Wed, 13 Jan 1999 03:42:09 +0800 Sarunas Cepulis <@spam@sarasKILLspamKAUNAS.AIVA.LT>
writes:
>Jose Antonio Gracia Negre wrote:
>>
>> Knows that it happens when pic of 10 Mhz is made him work to 11,0592
>Mhz?
>>
>> Thanks
>Hi,
>I don't try 10 on 11.0592 , but I think all be O.K.
>Because I have 4Mhz pic16c/f84 working on 8Mhz without problems.
The 4 MHz chip is the same one as the 10 MHz one, just it may not have
been tested at 10 MHz (or it was tested at 10 MHz and found to not work).
So it's not suprising that they will work at more than 4 MHz.
Above 10 MHz is different. If Microchip could be sure that every
PIC16F84-10 they shipped would work at (for example) 12 MHz, they'd rate
them for 12 MHz. Of course they are being very conservative with the
ratings. I have had several working at 16 MHz. But they were from the
same lot; another group may have all not worked. None of them wanted to
work at 20 MHz. I don't think that 11.0592 MHz will be a problem,
especially if your application doesn't subject the PIC to extreme
temperatures.
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1999\01\14@193935
by
ose Antonio Gracia Negre
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That same one I must do. It it will prove.
Tomas Kapostas escribi—:
> Nothing, PIC work :-)))))))))
> I overclocked a 4MHz 16F84 to 11,0592MHz and it's working too!!
> TOM.
>
>
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1999\01\14@194346
by
ose Antonio Gracia Negre
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I use 11'0592 to fit a clock better. I have already considered the adjustment
Glenville T. Sawyer escribi—:
> About the only problem likely with "overclocking" ( if you are using Serial
> I/O routines)
> is that the data rates could be incorrect, otherwise - they seem to work
> very well !
>
> Glenville T. Sawyer.
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1999\01\14@195146
by
ose Antonio Gracia Negre
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Yura:
overclocked 12/16 Mhz. and work Ok!
I do not smoke, but I hallucinate but that if it had smoked " grass "
(marihuana)
Without blocking itself?
Definitively, to pic 16f84-04 I am going to put it to 11 Mhz.
Yura Galayda escribi—:
>
> I overclocked a 4MHz 16F84 to 16MHz and 20 Mhz also work ;-)
>
> ------------
> Yuri Galayda at SIC Vector R&D Department KILLspamyuraKILLspamvector.kharkov.ua
> PGP public key available -- finger RemoveMEyuraTakeThisOuTvector.kharkov.ua | pgp -kaf
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1999\01\14@195808
by
ose Antonio Gracia Negre
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1999\01\16@122807
by
dave vanhorn
At 12:49 AM 1/14/99 +0100, Jose Antonio Gracia Negre wrote:
>Knows that it happens when pic of 10 Mhz is made him work to 11,0592 Mhz?
>
>Thanks
>
>
If you try to run a chip faster than it's rated speed, it may work, but if
it fails in any way to operate properly, it's YOUR fault. The supplier will
not help you. Making it run at 11.05 instead of 10 is something I might
do for a hobby project, but I would <NEVER> do that in production. Not even
11.10
1999\01\16@123024
by
dave vanhorn
At 07:44 PM 1/13/99 -0500, NCS Products wrote:
>At 12:49 AM 1/14/99 +0100, Jose Antonio Gracia Negre wrote:
>>Knows that it happens when pic of 10 Mhz is made him work to 11,0592 Mhz?
>
>Smoke? Fire?
>
>No, really, nothing bad will happen. I've run
>16F84-10's (10 mHz) at 16mHz without incident.
For a single hobby project, fine no problem.
If you make 10 of them, will 10 work? 3? 1?
This is a great way to cause yourself lots of wierd problems.
1999\01\16@123425
by
dave vanhorn
At 07:13 AM 1/14/99 +0100, Tomas Kapostas wrote:
>Nothing, PIC work :-)))))))))
>I overclocked a 4MHz 16F84 to 11,0592MHz and it's working too!!
>TOM.
This is like running through red lights. Usually you don't get hit.
1999\01\17@153617
by
ose Antonio Gracia Negre
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dave vanhorn escribi—:
>
> If you try to run a chip faster than it's rated speed, it may work, but if
> it fails in any way to operate properly, it's YOUR fault. The supplier will
> not help you. Making it run at 11.05 instead of 10 is something I might
> do for a hobby project, but I would <NEVER> do that in production. Not even
> 11.10
Thanks Dave.
All circuits admit to exceed the limits in some amount.
I have difficulties to obtain 20Mh. (not if hay)y pequ6nas
series, for that reason, I try to force the 10 Mhz. for a assembly, that, if it
works, I want to commercialize.
Saludos
Jose Antonio Gracia
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