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Home Digital Electronics Logic Families and Their Characteristics Comments

  • Question
  • Which of the following summarizes the important features of emitter-coupled logic (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. low 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 


  • Logic Families and Their Characteristics problems


    Search Results


    • 1. Which family of devices has the characteristic of preventing saturation during operation?

    • Options
    • A. TTL
    • B. MOS
    • C. ECL
    • D. IIL
    • Discuss
    • 2. The problem of the VOH(min) of a TTL IC being too low to drive a CMOS circuit and meet the CMOS requirement of VIH(min) is usually easily overcome by:

    • Options
    • A. adding a fixed voltage-divider bias resistive network at the output of the TTL device
    • B. avoiding this condition and only using TTL to drive TTL
    • C. adding an external pull-down resistor to ground
    • D. adding an external pull-up resistor to VCC
    • Discuss
    • 3. PMOS and NMOS ________.

    • Options
    • A. represent MOSFET devices utilizing either P-channel or N-channel devices exclusively within a given gate
    • B. are enhancement-type CMOS devices used to produce a series of high-speed logic known as 74HC
    • C. represent positive and negative MOS-type devices, which can be operated from differential power supplies and are compatible with operational amplifiers
    • D. None of the above
    • Discuss
    • 4. Which of the following logic families has the shortest propagation delay?

    • Options
    • A. CMOS
    • B. BiCMOS
    • C. ECL
    • D. 74SXX
    • Discuss
    • 5. Why is the operating frequency for CMOS devices critical for determining power dissipation?

    • Options
    • A. At low frequencies, power dissipation increases.
    • B. At high frequencies, the gate will only be able to deliver 70.7 % of rated power.
    • C. At high frequencies, charging and discharging the gate capacitance will draw a heavy current from the power supply and thus increase power dissipation.
    • D. At high frequencies, the gate will only be able to deliver 70.7 % of rated power and charging and discharging the gate capacitance will draw a heavy current from the power supply and thus increase power dissipation.
    • Discuss
    • 6. Why is a decoupling capacitor needed for TTL ICs and where should it be connected?

    • Options
    • A. to block dc, connect to input pins
    • B. to reduce noise, connect to input pins
    • C. to reduce the effects of noise, connect between power supply and ground
    • Discuss
    • 7. 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
    • 8. The TTL HIGH level source current is higher than the LOW level sinking current.

    • Options
    • A. True
    • B. False
    • Discuss
    • 9. The most common TTL series ICs are:

    • Options
    • A. E-MOSFET
    • B. 7400
    • C. quad
    • D. AC00
    • Discuss
    • 10. 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


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