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Home Digital Electronics Logic Families and Their Characteristics Comments

  • Question
  • Which logic family is characterized by a multiemitter transistor on the input?


  • Options
  • A. ECL
  • B. CMOS
  • C. TTL
  • D. None of the above

  • Correct Answer
  • TTL 


  • Logic Families and Their Characteristics problems


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    • 1. 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
    • 2. 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
    • 3. Can a 74HCMOS logic gate directly connect to a 74ALSTTL gate?

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. Why must CMOS devices be handled with care?

    • Options
    • A. so they don't get dirty
    • B. because they break easily
    • C. because they can be damaged by static electricity discharge
    • Discuss
    • 9. Totem-pole outputs ________ be connected ________ because ________.

    • Options
    • A. can, in parallel, sometimes higher current is required
    • B. cannot, together, if the outputs are in opposite states excessively high currents can damage one or both devices
    • C. should, in series, certain applications may require higher output voltage
    • D. can, together, together they can handle larger load currents and higher output voltages
    • Discuss
    • 10. A TTL totem-pole circuit is designed so that the output transistors:

    • Options
    • A. are always on together
    • B. provide linear phase splitting
    • C. provide voltage regulation
    • D. are never on together
    • Discuss


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