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  • Question
  • List the state of each output pin of a 7447 if RBI = 0, LT = 1, A0 = 1, A1 = 0, A2 = 0, and A3 = 1.


  • Options
  • A. RBO = 0, a = 0, b = 0, c = 0, d = 1, e = 1, f = 0, g = 0
  • B. RBO = 1, a = 0, b = 0, c = 0, d = 1, e = 1, f = 0, g = 0
  • C. RBO = 0, a = 0, b = 0, c = 0, d = 0, e = 1, f = 0, g = 0
  • D. RBO = 1, a = 0, b = 0, c = 0, d = 0, e = 1, f = 0, g = 0

  • Correct Answer
  • RBO = 0, a = 0, b = 0, c = 0, d = 1, e = 1, f = 0, g = 0 


  • Counters problems


    Search Results


    • 1. What is the difference between a 7490 and a 7492?

    • Options
    • A. 7490 is a MOD-12, 7492 is a MOD-10
    • B. 7490 is a MOD-12, 7492 is a MOD-16
    • C. 7490 is a MOD-16, 7492 is a MOD-10
    • D. 7490 is a MOD-10, 7492 is a MOD-12
    • Discuss
    • 2. Which is not an Altera primitive port identifier?

    • Options
    • A. clk
    • B. ena
    • C. clr
    • D. prn
    • Discuss
    • 3. The toggle condition in a master-slave J-K flip-flop means that Q and will switch to their ________ state(s) at the ________.

    • Options
    • A. opposite, active clock edge
    • B. inverted, positive clock edge
    • C. quiescent, negative clock edge
    • D. reset, synchronous clock edge
    • Discuss
    • 4. The output of a gated S-R flip-flop changes only if the:

    • Options
    • A. flip-flop is set
    • B. control input data has changed
    • C. flip-flop is reset
    • D. input data has no change
    • Discuss
    • 5. A correct output is achieved from a master-slave J-K flip-flop only if its inputs are stable while the:

    • Options
    • A. clock is LOW
    • B. slave is transferring
    • C. flip-flop is reset
    • D. clock is HIGH
    • Discuss
    • 6. The hexadecimal equivalent of 15,536 is ________.

    • Options
    • A. 3CB0
    • B. 3C66
    • C. 63C0
    • D. 6300
    • Discuss
    • 7. Referring to the given figure, at which point is the serial data transferred to the parallel output?


    • Options
    • A. W
    • B. X
    • C. Y
    • D. Z
    • Discuss
    • 8. Three cascaded decade counters will divide the input frequency by ________.

    • Options
    • A. 10
    • B. 20
    • C. 100
    • D. 1,000
    • Discuss
    • 9. The terminal count of a 3-bit binary counter in the DOWN mode is ________.

    • Options
    • A. 000
    • B. 111
    • C. 101
    • D. 010
    • Discuss
    • 10. For a one-shot application, how can HDL code be used to make a circuit respond once to each positive transition on its trigger input?

    • Options
    • A. By using a counter
    • B. By using an active clock
    • C. By using an immediate reload
    • D. By using edge trapping
    • Discuss


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