MOD 13 Counter

Discussion in 'Homework Help' started by rskye, Nov 16, 2010.

  1. rskye

    Thread Starter New Member

    Nov 14, 2010
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    I would like to see a schematic of two flip flops to make a MOD 13 counter. I'm thinking I need a 7490 and 7492 flip flop to acheive this. I need help. Does Q3 of the first flip flop go to the J of the second or the clock input?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Your terminology is not correct.
    So would we. Two flip flops can count 0 - 3.

    These ICs are counters, not flip flops. The '90 can count to 10 (0 - 9), while the '92 counts to 12 (0 - 11).

    Do you have data sheets for these ICs?
     
  3. rskye

    Thread Starter New Member

    Nov 14, 2010
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    0
    Oops its a MOD 13 counter using a 7493 IC chip that is NANDed to make an output to make 13. where is NANDed to is it on the Q1 and all the other outputs (Q0, Q2, Q3) are grounded. is this better?
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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    Are you trying to make a counter that goes 0 - 12 and falls back to 0 on the next clock? Both the '90 & '93 have reset inputs.
     
  5. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
    2,802
    832
    You don't want to ground your outputs; you will soon have an ic that no longer works:eek:
    Think of how you can use the NAND gates to identify when you have counted 13 and how to use the reset inputs to start over...
     
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