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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. Address multiplexing is used to reduce the number of address lines.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. Which type of ROM has to be custom built by the factory?

    • Options
    • A. ROM
    • B. mask ROM
    • C. EPROM
    • D. EEPROM
      • Discuss
    • 3. The RST pin requires a HIGH to reset the 8051 microcontroller.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. How many clock pulses will be required to completely load serially a 5-bit shift register?

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 5
      • Discuss
    • 5. A data selector is also called a demultiplexer.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. The ________ statement evaluates the variable status.

    • Options
    • A. IF/THEN
    • B. IF/THEN/ELSE
    • C. CASE
    • D. ELSIF
      • Discuss
    • 7. A NAND gate output is LOW only if all the inputs are HIGH.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. Edge-triggered flip-flops can be identified by the triangle on the clock input.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. How many select lines would be required for an 8-line-to-1-line multiplexer?

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 8
      • Discuss
    • 10. A(n)________ is not a functional unit of a computer.

    • Options
    • A. input unit
    • B. memory unit
    • C. modem
    • D. control unit
      • Discuss

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