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Home Digital Electronics Logic Families and Their Characteristics Comments

  • Question
  • The problem of different current requirements when CMOS logic circuits are driving TTL logic circuits can usually be overcome by the addition of:


  • Options
  • A. a CMOS inverting bilateral switch between the stages
  • B. a TTL tristate inverting buffer between the stages
  • C. a CMOS noninverting bilateral switch between the stages
  • D. a CMOS buffer or inverting buffer

  • Correct Answer
  • a CMOS buffer or inverting buffer 


  • Logic Families and Their Characteristics problems


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    • 1. 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
    • 2. 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
    • 3. 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
    • 4. How many 74LSTTL logic gates can be driven from a 74TTL gate?

    • Options
    • A. 10
    • B. 20
    • C. 200
    • D. 400
    • Discuss
    • 5. 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
    • 6. What is the major advantage of ECL logic?

    • Options
    • A. very high speed
    • B. wide range of operating voltage
    • C. very low cost
    • D. very high power
    • Discuss
    • 7. What is the static charge that can be stored by your body as you walk across a carpet?

    • Options
    • A. 300 volts
    • B. 3,000 volts
    • C. 30,000 volts
    • D. Over 30,000 volts
    • Discuss
    • 8. Which of the following logic families has the highest maximum clock frequency?

    • Options
    • A. S-TTL
    • B. AS-TTL
    • C. HS-TTL
    • D. HCMOS
    • Discuss
    • 9. What causes low-power Schottky TTL to use less power than the 74XX series TTL?

    • Options
    • A. The Schottky-clamped transistor
    • B. Nothing. The 74XX series uses less power.
    • C. A larger value resistor
    • D. Using NAND gates
    • Discuss
    • 10. Which of the following statements apply to CMOS devices?

    • Options
    • A. The devices should not be inserted into circuits with the power on.
    • B. All tools, test equipment, and metal workbenches should be tied to earth ground.
    • C. The devices should be stored and shipped in antistatic tubes or conductive foam.
    • D. All of the above.
    • Discuss


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