PIC18f45k20 maximum clock speed

Discussion in 'General Electronics Chat' started by Robin Mitchell, Sep 5, 2013.

  1. Robin Mitchell

    Thread Starter Well-Known Member

    Oct 25, 2009
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    Hi everyone,

    I noticed that the largest internal oscillator speed is 64Mhz (if you use PLL) but what im trying to figure out is what is the maximum clock speed if you use an external clock? Is it 64Mhz (like the internal oscillator) or can I go higher? Im having a tough time finding this on the datasheet. Any help is much appreciated :D

    All the best,
    Robin
     
  2. bertus

    Administrator

    Apr 5, 2008
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    Robin Mitchell likes this.
  3. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    per the features it says
    "Two external clock modes up to 64 MHz"
     
  4. Robin Mitchell

    Thread Starter Well-Known Member

    Oct 25, 2009
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    Fantastic!

    But here is a question, is this 64 before PLL or after PLL???
     
  5. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    its 64 MAX...
     
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  6. Robin Mitchell

    Thread Starter Well-Known Member

    Oct 25, 2009
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    Awww :(
    But can I? NO
    But what if I..? NO

    Ok
     
  7. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    Try it if you like. I remember in the old days people were running PICs at far above the "max" speed, as much as four times over.

    It will depend on how much you try to bump the speed, how cool you can keep the chip and what failure rate you can tolerate.
     
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