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Home Digital Electronics Logic Families and Their Characteristics Comments

  • Question
  • What is the range of invalid TTL output voltage?


  • Options
  • A. 0.0?0.4 V
  • B. 0.4?2.4 V
  • C. 2.4?5.0 V
  • D. 0.0?5.0 V

  • Correct Answer
  • 0.4?2.4 V 


  • Logic Families and Their Characteristics problems


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    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. What is the standard TTL noise margin?

    • Options
    • A. 5.0 V
    • B. 0.0 V
    • C. 0.8 V
    • D. 0.4 V
    • Discuss
    • 7. How many 74LSTTL logic gates can be driven from a 74TTL gate?

    • Options
    • A. 10
    • B. 20
    • C. 200
    • D. 400
    • Discuss
    • 8. What should be done with unused inputs to a TTL NAND gate?

    • Options
    • A. let them float
    • B. tie them LOW
    • C. tie them HIGH
    • Discuss
    • 9. What is the difference between the 74HC00 series and the 74HCT00 series of CMOS logic?

    • Options
    • A. The HCT series is faster.
    • B. The HCT series is slower.
    • C. The HCT series is input and output voltage compatible with TTL.
    • D. The HCT series is not input and output voltage compatible with TTL.
    • Discuss
    • 10. The word "interfacing" as applied to digital electronics usually means:

    • Options
    • A. a conditioning circuit connected between a standard TTL NAND gate and a standard TTL OR gate
    • B. a circuit connected between the driver and load to condition a signal so that it is compatible with the load
    • C. any gate that is a TTL operational amplifier designed to condition signals between NMOS transistors
    • D. any TTL circuit that is an input buffer stage
    • Discuss


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