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Home ‣ Digital Electronics ‣ Logic Families and Their Characteristics See What Others Are Saying!
  • Question

  • What should be done to unused inputs on TTL gates?


  • Options
  • A. They should be left disconnected so as not to produce a load on any of the other circuits and to minimize power loading on the voltage source.
  • B. All unused gates should be connected together and tied to V through a 1 k Ω resistor.
  • C. All unused inputs should be connected to an unused output; this will ensure compatible loading on both the unused inputs and unused outputs.
  • D. Unused AND and NAND inputs should be tied to VCC through a 1 kΩ resistor; unused OR and NOR inputs should be grounded.

  • Correct Answer
  • Unused AND and NAND inputs should be tied to VCC through a 1 kΩ resistor; unused OR and NOR inputs should be grounded. 

    • More questions

    • 1. PALs tend to execute ________ logic.

    • Options
    • A. SAP
    • B. SOP
    • C. PLA
    • D. SPD
      • Discuss
    • 2. 34FC + AD31 = ________.

    • Options
    • A. E22D
    • B. E31D
    • C. E21D
    • D. E42D
      • Discuss
    • 3. A decimal 11 in BCD is ________.

    • Options
    • A. 00001011
    • B. 00001100
    • C. 00010001
    • D. 00010010
      • Discuss
    • 4. Convert the following BCD number to decimal.
      010101101001bcd

    • Options
    • A. 539
    • B. 2551
    • C. 569
    • D. 1552
      • Discuss
    • 5. Parallel transmission is faster than serial.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. The complement of 1 is 0.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. Digital signal processing must be at least half as fast as the incoming signal to be processed.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. In the keypad HDL encoder, NANDing of the columns is used to activate the freeze bit.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. Resolution in the analog output of a DAC is primarily dependent on the number of input binary bits.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. The carry-out of a binary adder is identified using the summation symbol, sigma.

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

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