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Home ‣ Digital Electronics ‣ Integrated-Circuit Logic Families Comments
  • Question

  • Which of the following summarizes the important features of ECL?


  • Options
  • A. Low noise margin, low output voltage swing, negative voltage operation, fast, and high power consumption
  • B. Good noise immunity, negative logic, high frequency capability, low power dissipation, and short propagation time
  • C. Slow propagation time, high frequency response, low power consumption, and high output voltage swings
  • D. Poor noise immunity, positive supply voltage operation, good low frequency operation, and low power

  • Correct Answer
  • Low noise margin, low output voltage swing, negative voltage operation, fast, and high power consumption 

    • Integrated-Circuit Logic Families problems

    Search Results

    • 1. What type of circuit is represented in the given figure, and which statement best describes its operation?


    • Options
    • A. It is a tristate inverter. When the ENABLE input is HIGH, the output is effectively an open circuit?it is neither LOW nor HIGH.
    • B. It is a programmable inverter. It can be programmed to function as either an active LOW or an active HIGH inverter.
    • C. It is an active LOW buffer, which can be turned on and off by the ENABLE input.
    • D. None of the above.
      • Discuss
    • 2. What is unique about TTL devices such as the 74S00?

    • Options
    • A. The gate transistors are silicon (S), and the gates therefore have lower values of leakage current.
    • B. The S denotes the fact that a single gate is present in the IC rather than the usual package of 2?6 gates.
    • C. The S denotes a slow version of the device, which is a consequence of its higher power rating.
    • D. The 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.
      • Discuss
    • 3. 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.
      • Discuss
    • 4. Refer the given figure. Which of the following describes the operation of the circuit?


    • Options
    • A. A LOW input turns Q1 and Q3 on; Q2 and Q4 are off.
    • B. A LOW input turns Q1 and Q4 off; Q2 and Q3 are on.
    • C. A HIGH input turns Q1, Q2, and Q3 off, and Q4 is on.
    • D. A HIGH input turns Q1, Q2, and Q4 on; Q3 is off.
      • Discuss
    • 5. Generally, the voltage measured at an unused TTL input would typically be measured between:

    • Options
    • A. 1.4 to 1.8 V.
    • B. 0 to 5 V.
    • C. 0 to 1.8 V.
    • D. 0.8 to 5 V.
      • Discuss
    • 6. Logic circuits that are designated as buffers, drivers, or buffer/drivers are designed to have:

    • Options
    • A. a greater current/voltage capability than an ordinary logic circuit.
    • B. greater input current/voltage capability than an ordinary logic circuit.
    • C. a smaller output current/voltage capability than an ordinary logic.
    • D. greater input and output current/voltage capability than an ordinary logic circuit.
      • Discuss
    • 7. In an HDL stepper motor design, why is there more than one mode?

    • Options
    • A. To change the speed of the stepper motor
    • B. To change the direction of the stepper motor
    • C. To direct drive the stepper motor
    • D. All of the above
      • Discuss
    • 8. For the frequency counter, which is not a control signal from the control and timing block?

    • Options
    • A. Clear
    • B. Enable
    • C. Reset
    • D. Store
      • Discuss
    • 9. List three basic blocks in the digital clock project.

    • Options
    • A. MOD-60, MOD-12 counters
    • B. MOD-5, MOD-10, MOD-12 counters
    • C. MOD-60, MOD-10 counters
    • D. MOD-6, MOD-12, and MOD-10 counters
      • Discuss
    • 10. In the keypad application, what does the preset state of the ring counter define?

    • Options
    • A. The proper output of the column encoder
    • B. The NANDing of the rows
    • C. The NANDing of the columns
    • D. The proper output of the row encoder
      • Discuss

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