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Calculate MD4060B

Discussion in 'Electronic Design' started by Johan Karremans, Oct 4, 2004.

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  1. Can somebody tell me how i can calculate the crystal value for a
    CD4060B. I have now a circuit with a output signal on pin 6 from 9600
    Hz(1200 x 16 (input for AY-3-1015)) and a crystal from 2.457600MHz. I
    need on pin 6 a output signal from 153600 Hz (9600 x 16) but i did no
    how to calculate.
  2. Tim Wescott

    Tim Wescott Guest


    You can do this calculation by understanding how the chip works.
    Studying the data sheet will show you that each "Qxx" output is a stage
    in a binary ripple counter, so Q4 is the crystal frequency divided by
    2^4, Q7 (pin 6) is the crystal frequency divided by 2^7 (and as a check
    you'll see that 2.4576MHz/128 is indeed 19200Hz).

    So to get 153600Hz you would need a crystal frequency of 19.6608MHz --
    but according to my National Semi databook that's pushing it for the
    4060, so you may have trouble getting the circuit to work (or maybe
    not). You could take your output from the Q4 output (pin 7) and not
    change crystals.

  3. Tim,

    Thanks for this quick reaction. I will try of it's works.
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