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Home Digital Electronics Logic Families and Their Characteristics Comments

  • Question
  • How does the 4000 series of CMOS logic compare in terms of speed and power dissipation to the standard family of TTL logic?


  • Options
  • A. more power dissipation and slower speed
  • B. more power dissipation and faster speed
  • C. less power dissipation and faster speed
  • D. less power dissipation and slower speed

  • Correct Answer
  • less power dissipation and slower speed 


  • Logic Families and Their Characteristics problems


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    • 1. How can ECL have both a NOR and an OR output?

    • Options
    • A. ECL does not have this feature.
    • B. They are simply the inverse of each other.
    • Discuss
    • 2. What is the advantage of using low-power Schottky (LS) over standard TTL logic?

    • Options
    • A. more power dissipation
    • B. less power dissipation
    • C. cost is less
    • D. cost is more
    • Discuss
    • 3. When is a level-shifter circuit needed in interfacing logic?

    • Options
    • A. A level shifter is always needed.
    • B. A level shifter is never needed.
    • C. when the supply voltages are the same
    • D. when the supply voltages are different
    • Discuss
    • 4. Using the schematic diagram of a TTL NAND gate, determine the state of each transistor (ON or OFF) when all inputs are high.

    • Options
    • A. Q1-ON, Q2-OFF, Q3-ON, Q4-OFF
    • B. Q1-ON, Q2-ON, Q3-OFF, Q4-OFF
    • C. Q1-OFF, Q2-OFF, Q3-ON, Q4-ON
    • D. Q1-OFF, Q2-ON, Q3-OFF, Q4-ON
    • Discuss
    • 5. The term buffer/driver signifies the ability to provide low output currents to drive light loads.

    • Options
    • A. True
    • B. False
    • Discuss
    • 6. The high input impedance of MOSFETs:

    • Options
    • A. allows faster switching
    • B. reduces input current and power dissipation
    • C. prevents dense packing
    • D. creates low-noise reactions
    • Discuss
    • 7. What is the difference between the 54XX and 74XX series of TTL logic gates?

    • Options
    • A. 54XX is faster.
    • B. 54XX is slower.
    • C. 54XX has a wider power supply and expanded temperature range.
    • D. 54XX has a narrower power supply and contracted temperature range.
    • Discuss
    • 8. Special handling precautions should be taken when working with MOS devices. Which of the following statements is not one of these precautions?

    • Options
    • A. All test equipment should be grounded.
    • B. MOS devices should have their leads shorted together for shipment and storage.
    • C. Never remove or insert MOS devices with the power on.
    • D. Workers handling MOS devices should not have grounding straps attached to their wrists.
    • Discuss
    • 9. Can a 74HCMOS logic gate directly connect to a 74ALSTTL gate?

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 10. How is the speed?power product of a logic family determined?

    • Options
    • A. The propagation delay in µs is multiplied by the power dissipation in mW.
    • B. The propagation delay in ms is multiplied by the power dissipation in µW.
    • C. The propagation delay in ns is multiplied by the power dissipation in mW.
    • D. The propagation delay in ns is multiplied by the power dissipation in µW.
    • Discuss


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