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Programmable clock divide-by-N

Discussion in 'Electronic Basics' started by Thomas Magma, Dec 18, 2009.

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  1. Thomas Magma

    Thomas Magma Guest

    For some reason I'm having troubles finding a programmable clock divider
    chip. I have a 20MHz reference clock that I need divided by 23. I would like
    the option of changing this divide ratio if needed. I can't seem to find a
    simple single chip solution (smaller the better). I'm currently looking at
    CPLDs which is not a clean solution because of ICP. The 40103 is another
    option but is border line with the max speed vs my operating voltage. I'm
    also looking at using the R or N counters of a synthesizer chip if this is
    at all possible.

    Seems to me there should be a two wire programmable SC70 divide-by-N
    available, but I can't seem to find anything close.

    Any thoughts?

  2. Thomas Magma

    Thomas Magma Guest

    Thanks Brendan, could you elaborate on what series the Fxxxx is? I'm having
    a hard time finding it.

  3. pimpom

    pimpom Guest

    Is the 54/74HC4059 any good to you?
  4. Thomas Magma

    Thomas Magma Guest

    I originaly looked at the 4059 but can't find this chip in a fine pitched
    package, it's too large for the project. I was also hoping for some sort of
    serial interface so I'm not using up unnecessary pins on my micro.

  5. Jasen Betts

    Jasen Betts Guest

    buy a micro with extra counter and use that
    that'll only use 2 pins (worst case: if you need an output and the
    20Mhz input is different from the chip's clock)

    --- news:// - complaints: ---
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