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100MHz counter

Discussion in 'Datasheets, Manuals and Component Identification' started by duke37, May 20, 2011.

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  1. duke37


    Jan 9, 2011
    I have a 10Mhz frequency counter board based on a ICM7216A. I would like to count to a higher frequency than this and have looked at various decade counters, they do not go to 100Mhz.
    CD74LS90 42MHz
    SN7490A 42MHz
    74HCT4060 67MHZ
    74HC4017 ? 77MHz
    Are there any decade counters that go to 100MHz in Dip package (my mig welder won't do surface mount components!)
  2. davenn

    davenn Moderator

    Sep 5, 2009

    what you really need is a /10 prescaler chip :) do a google search on such
    many of them go far into the GHz range so you could seriously expand your counter's abilities

  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    You can always make a twisted ring counter. It will (with 5 flip flops) divide by 10.

    Since only 1 flip flop changes state on each clock transition, you can use logic that otherwise incapable of switching at that speed.

    However, a dedicated prescaler may be a better option.
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