Mod 13 counter

Discussion in 'Homework Help' started by 200815712, Mar 26, 2009.

  1. 200815712

    Thread Starter New Member

    Mar 26, 2009
    1
    0
    IM IN NEED OF AN ASYNCHRONOUS MODE-13 UP COUNTER LOGIC DIAGRAM TO CONSTRUCT(USING NEGATIVE EGDE TRIGGERED J-K FLIP FLOPS ),IC's(7476).PLZ HELP!!!!
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Please do not hijack threads by posting new topics into them.

    Make the counter with the J-K flip flops, but use an external AND gate to detect the count of 13. Look at the data sheet for a counter like the 161 to get a hint.
     
  3. hitmen

    Active Member

    Sep 21, 2008
    159
    0
    Hint: for mod 13 how many flip flop do you need? Remember 2 to the power of N.
    note that 13 = 1101
     
  4. kiranag

    Member

    Apr 14, 2009
    12
    0
    13 is 1101. First you place four JK flip flops side by side so that the leftmost flipflop will be your LSB(q0) and the rightmost be your MSB(q3). Give all flip flops inputs JK to Vcc. Give the main clock pulse which is to be counted to the clock input of LSB flip flop. Give the output q0 as the clock to second flip flop next to LSB and the output q1 as the clock to third flip flop and q2 as the clock to MSB flip flop. since 13 is 1101, take the output q3, q2 and q0 AND them and connect them to clear pin of all flip flops so that as soon as it counts 13, all the flip flops will be cleared to zero and the counter restarts. Here is the circuit. View attachment ckt.psd Hope it has helped.
     
  5. circuit101

    New Member

    Apr 29, 2009
    2
    0
    "..since 13 is 1101, take the output q3, q2 and q0 AND them and connect them to clear pin of all flip flops.."

    Does this mean we take the output q3, q2, q0 and AND them

    or.. do we also include q1? why do we leave q1 out?

    or.. do you mean: leave q3 as the output and AND q2, q0 only?

    :confused:
     
  6. circuit101

    New Member

    Apr 29, 2009
    2
    0
    NVR mind. we AND q0, q2, q3 because of 1101
    :rolleyes:
     
  7. lqyromeo

    New Member

    Oct 28, 2008
    8
    0
    Maybe i am learner of PCB, so i couldn't follow with you, but still thank you for the requiry.
     
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