logo

CuriousTab

CuriousTab

Discussion

Home ‣ Digital Electronics ‣ Integrated-Circuit Logic Families See What Others Are Saying!
  • Question

  • What must be done to interface TTL to CMOS?


  • Options
  • A. A dropping resistor must be used on the CMOS 12 V supply to reduce it to 5 V for the TTL.
  • B. As long as the CMOS supply voltage is 5 V, they can be interfaced; however, the fan-out of the TTL is limited to five CMOS gates.
  • C. A 5 V Zener diode must be placed across the inputs of the TTL gates in order to protect them from the higher output voltages of the CMOS gates.
  • D. A pull-up resistor must be used between the TTL output-CMOS input node and Vcc; the value of RP will depend on the number of CMOS gates connected to the node.

  • Correct Answer
  • A pull-up resistor must be used between the TTL output-CMOS input node and Vcc; the value of RP will depend on the number of CMOS gates connected to the node. 

    • More questions

    • 1. The first microprocessor had a(n)________.

    • Options
    • A. 1-bit data bus
    • B. 2-bit data bus
    • C. 4-bit data bus
    • D. 8-bit data bus
      • Discuss
    • 2. If a 3-input OR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?

    • Options
    • A. 1
    • B. 2
    • C. 7
    • D. 8
      • Discuss
    • 3. The select inputs to a multiplexer may also be called address lines.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. How many 2-input NOR gates does it take to produce a 2-input NAND gate?

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
      • Discuss
    • 5. The 7476 and 74LS76 are both dual flip-flops.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. How many different states does a 3-bit asynchronous counter have?

    • Options
    • A. 2
    • B. 4
    • C. 8
    • D. 16
      • Discuss
    • 7. The invalid range for an input to TTL logic is from ________.

    • Options
    • A. 0 to 0.8 V
    • B. 1.2 to 1.6 V
    • C. 0.8 to 2.0 V
    • D. 2.0 to 5.0 V
      • Discuss
    • 8. A typical fan-out for most TTL is 9.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. The outputs of the 74138 octal decoder are enabled when the enable inputs are
      .

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. Convert the following hexadecimal number to decimal.
      B516

    • Options
    • A. 212
    • B. 197
    • C. 165
    • D. 181
      • Discuss

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.