82C84 Clock Generator Circuit

Discussion in 'The Projects Forum' started by nDever, Feb 18, 2011.

  1. nDever

    Thread Starter Active Member

    Jan 13, 2011
    154
    4
    Hey Guys,

    I have a 8284A and the CMOS version (82C84). I have the circuit set similarly to this schematic. When I placed the 8284A in the circuit, it works fine. When I place the CMOS version in the circuit, I get no clock signal. Is there a requirement of CMOS that I am not satisfying?

    [​IMG]
     
  2. Papabravo

    Expert

    Feb 24, 2006
    10,142
    1,790
    On any CMOS chip there should be no floating inputs. Every input must be tied high or low. This is a non-negotiable CMOS requirement.
     
  3. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
    1,758
    98
    Caps? Crystal & bypass.
     
  4. nDever

    Thread Starter Active Member

    Jan 13, 2011
    154
    4
    The circuit is functioning now. In my actual circuit (not the schematic), I had 330\Omega resistors across X1 and X2 to reduce frequency shifting but with the CMOS chip, they were pulling my signal to ground.
     
  5. Papabravo

    Expert

    Feb 24, 2006
    10,142
    1,790
    Great! Another case of the documentation not matching reality. You should go far in this business my boy; and I hope soon!
     
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