74hc74 flip flop question

Discussion in 'The Projects Forum' started by sleigher, Jan 23, 2012.

  1. sleigher

    Thread Starter New Member

    Jan 23, 2012
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    0
    Hi

    I have a question about a 14 pin 74hc74. It's a Dual D-Type flip flop. I have it currently being used in a circuit to divide the time by 4. 18.432 Mhz to 4.608 for serial communications.

    I want to run the circuit timing faster. Say 36.864 Mhz. That's all fine and good until I need to divide by 8. I can get a quad flip flop (74hc175?) to perform this function but it is a 16 pin chip instead of a 14 pin. The board it's on has holes for 14 pins.

    My question is does anyone have any clever ideas or ways to adapt a 16 pin flip flop to a 14 pin socket and still maintain the /8 function?

    Thanks in advance...
     
  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,386
    1,605
    Perhaps something like the MC14024 would help. It's a 7 stage "ripple counter" made up of 7 flip flops in series, for lots of dividers. I doubt any of the pins line up with your board beyond power and ground but it fits inside the 14 pin limit.
     
  3. sleigher

    Thread Starter New Member

    Jan 23, 2012
    2
    0
    That's an ok idea, but would require me to make an adapter. Right now I stack 2 74hc74's and solder a few chips to get the function of a quad. I guess I could make an adapter, daughter board, for a quad. Just seems like a lot of work and it's kinda flaky...
     
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