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Home Digital Electronics Logic Families and Their Characteristics Comments

  • Question
  • Can a 74HCMOS logic gate directly connect to a 74ALSTTL gate?


  • Options
  • A. Yes
  • B. No

  • Correct Answer
  • Yes 


  • Logic Families and Their Characteristics problems


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    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • Discuss
    • 5. 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
    • 6. 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
    • 7. As a general rule, the lower the value of the speed?power product, the better the device because of its:

    • Options
    • A. long propagation delay and high power consumption
    • B. long propagation delay and low power consumption
    • Discuss
    • 8. Which logic family is characterized by a multiemitter transistor on the input?

    • Options
    • A. ECL
    • B. CMOS
    • C. TTL
    • D. None of the above
    • Discuss
    • 9. From the following specifications determine the fan-out for the logic family.

    • Options
    • A. HIGH state is 16, LOW state is 8
    • B. HIGH state is 8, LOW state is 16
    • C. HIGH state is 4, LOW state is 8
    • D. HIGH state is 8, LOW state is 4
    • Discuss
    • 10. What is unique about TTL devices such as the 74SXX?

    • Options
    • A. These devices use Schottky transistors and diodes to prevent them from going into saturation; this results in faster turn-on and turn-off times, which translates into higher frequency operation.
    • B. The gate transistors are silicon (S), and the gates therefore have lower values of leakage current.
    • C. The S denotes the fact that a single gate is present in the IC rather than the usual package of 2?6 gates.
    • D. The S denotes a slow version of the device, which is a consequence of its higher power rating.
    • Discuss


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