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  • Question
  • What is the difference between a 7490 and a 7493?


  • Options
  • A. 7490 is a MOD-10, 7493 is a MOD-16
  • B. 7490 is a MOD-16, 7493 is a MOD-10
  • C. 7490 is a MOD-12, 7493 is a MOD-16
  • D. 7490 is a MOD-10, 7493 is a MOD-12

  • Correct Answer
  • 7490 is a MOD-10, 7493 is a MOD-16 


  • Counters problems


    Search Results


    • 1. How many natural states will there be in a 4-bit ripple counter?

    • Options
    • A. 4
    • B. 8
    • C. 16
    • D. 32
    • Discuss
    • 2. A BCD counter is a ________.

    • Options
    • A. binary counter
    • B. full-modulus counter
    • C. decade counter
    • D. divide-by-10 counter
    • Discuss
    • 3. Synchronous construction reduces the delay time of a counter to the delay of:

    • Options
    • A. all flip-flops and gates
    • B. all flip-flops and gates after a 3 count
    • C. a single gate
    • D. a single flip-flop and a gate
    • Discuss
    • 4. How many different states does a 2-bit asynchronous counter have?

    • Options
    • A. 1
    • B. 2
    • C. 4
    • D. 8
    • Discuss
    • 5. A 4-bit up/down binary counter is in the DOWN mode and in the 1100 state. To what state does the counter go on the next clock pulse?

    • Options
    • A. 1101
    • B. 1011
    • C. 1111
    • D. 0000
    • Discuss
    • 6. Which of the following statements best describes the operation of a synchronous up-/down-counter?

    • Options
    • A. The counter can count in either direction, but must continue in that direction once started.
    • B. The counter can be reversed, but must be reset before counting in the other direction.
    • C. In general, the counter can be reversed at any point in its counting sequence.
    • D. The count sequence cannot be reversed, once it has begun, without first resetting the counter to zero.
    • Discuss
    • 7. Which of the following is an invalid output state for an 8421 BCD counter?

    • Options
    • A. 1110
    • B. 0000
    • C. 0010
    • D. 0001
    • Discuss
    • 8. How can a digital one-shot be implemented using HDL?

    • Options
    • A. By using a resistor and a capacitor
    • B. By applying the concept of a counter
    • C. By using a library function
    • D. By applying a level trigger
    • Discuss
    • 9. A modulus-10 counter must have ________.

    • Options
    • A. 10 flip-flops
    • B. flip-flops
    • C. 2 flip-flops
    • D. synchronous clocking
    • Discuss
    • 10. Why can a synchronous counter operate at a higher frequency than a ripple counter?

    • Options
    • A. The flip-flops change one after the other.
    • B. The flip-flops change at the same time.
    • C. A synchronous counter cannot operate at higher frequencies.
    • D. A ripple counter is faster.
    • Discuss


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