logo

CuriousTab

CuriousTab

Discussion


Home Digital Electronics Logic Families and Their Characteristics Comments

  • Question
  • Why is a pull-up resistor needed for an open collector gate?


  • Options
  • A. to provide Vcc for the IC
  • B. to provide ground for the IC
  • C. to provide the HIGH voltage
  • D. to provide the LOW voltage

  • Correct Answer
  • to provide the HIGH voltage 


  • Logic Families and Their Characteristics problems


    Search Results


    • 1. Ten TTL loads per TTL driver is known as:

    • Options
    • A. noise immunity
    • B. fan-out
    • C. power dissipation
    • D. propagation delay
    • Discuss
    • 2. The rise time (tr) is the time it takes for a pulse to rise from its ________ point up to its ________ point. The fall time (tf) is the length of time it takes to fall from the ________ to the ________ point.

    • Options
    • A. 10%, 90%, 90%, 10%
    • B. 90%, 10%, 10%, 90%
    • C. 20%, 80%, 80%, 20%
    • D. 10%, 70.7%, 70.7%, 10%
    • Discuss
    • 3. The most common TTL series ICs are:

    • Options
    • A. E-MOSFET
    • B. 7400
    • C. quad
    • D. AC00
    • Discuss
    • 4. The TTL HIGH level source current is higher than the LOW level sinking current.

    • Options
    • A. True
    • B. False
    • Discuss
    • 5. An open collector output can ________ current, but it cannot ________.

    • Options
    • A. sink, source current
    • B. source, sink current
    • C. sink, source voltage
    • D. source, sink voltage
    • Discuss
    • 6. If all inputs to a TTL NAND gate are low, what is the ON, OFF condition of each transistor in the circuit?

    • Options
    • A. Q1-ON, Q2-OFF, Q3-ON, Q4-OFF
    • B. Q1-ON, Q2-ON, Q3-OFF, Q4-OFF
    • C. Q1-OFF, Q2-OFF, Q3-ON, Q4-ON
    • D. Q1-OFF, Q2-ON, Q3-OFF, Q4-ON
    • Discuss
    • 7. Assume that a particular IC has a supply voltage (Vcc) equal to +5 V and ICCH = 10 mA and ICCL = 23 mA. What is the power dissipation for the chip?

    • Options
    • A. 50 mW
    • B. 82.5 mW
    • C. 115 mW
    • D. 165 mW
    • Discuss
    • 8. Fan-out is determined by taking the ________ result(s) of ________.

    • Options
    • A. smaller,
    • B. larger,
    • C. smaller,
    • D. average,
    • Discuss
    • 9. Why is a pull-up resistor needed when connecting TTL logic to CMOS logic?

    • Options
    • A. to increase the output LOW voltage
    • B. to decrease the output LOW voltage
    • C. to increase the output HIGH voltage
    • D. to decrease the output HIGH voltage
    • Discuss
    • 10. The output current capability of a single 7400 NAND gate when HIGH is called ________.

    • Options
    • A. source current
    • B. sink current
    • C. IOH
    • D. source current of IOH
    • Discuss


    Comments

    There are no comments.

Enter a new Comment