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Home ‣ Digital Electronics ‣ MSI Logic Circuits See What Others Are Saying!
  • Question

  • Refer to the figure given below. The logic function generator being implemented with the multiplexer in this circuit produces a constant LOW on the output. The ABC inputs are checked and appear to be pulsing; also, the 0?7 and EN inputs are checked with the scope and all appear to be at 0 V. A check with the DMM confirms that power is on. What is the problem, and what should be done to correct it?

    Refer to the figure given below. The logic function generator being implemented with the multiplexer


  • Options
  • A. The output is shorted to Vcc; replace the IC.
  • B. The scope's vertical input is in the AC mode and the common connection for the 0,2,3 and 5 inputs is bad. Set the scope's vertical input mode to DC, and repair the bad solder connection.
  • C. Power has not been applied to the circuit; apply power.
  • D. The output is shorted to ground; replace the IC.

  • Correct Answer
  • The scope's vertical input is in the AC mode and the common connection for the 0,2,3 and 5 inputs is bad. Set the scope's vertical input mode to DC, and repair the bad solder connection. 

    • More questions

    • 1. Which is not a part of a GAL16V8's OLMC?

    • Options
    • A. TSMUX
    • B. OMUX
    • C. FMUX
    • D. PSMUX
      • Discuss
    • 2. Output will be a LOW for any case when one or more inputs are zero for a(n):

    • Options
    • A. OR gate
    • B. NOT gate
    • C. AND gate
    • D. NOR gate
      • Discuss
    • 3. The sum of 11101 + 10111 equals ________.

    • Options
    • A. 110011
    • B. 100001
    • C. 110100
    • D. 100100
      • Discuss
    • 4. Hex is often used in digital applications as a shorthand way to represent strings of bits.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. Four cascaded modulus-10 counters have an overall modulus of ________.

    • Options
    • A. 10
    • B. 100
    • C. 1,000
    • D. 10,000
      • Discuss
    • 6. VHDL is not a new language.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. Which is not a removable drive?

    • Options
    • A. Zip
    • B. Jaz
    • C. Hard
    • D. SuperDisk
      • Discuss
    • 8. Which microprocessor has multiplexed data and address lines?

    • Options
    • A. 8086/8088
    • B. 80286
    • C. 80386
    • D. Pentium
      • Discuss
    • 9. One of the stages in a register consists of a latch.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. A VHDL component is a predefined logic function.

    • Options
    • A. True
    • B. False
      • Discuss

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