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Home Digital Electronics Logic Families and Their Characteristics Comments

  • Question
  • 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

  • Correct Answer
  • to reduce the effects of noise, connect between power supply and ground 


  • Logic Families and Their Characteristics problems


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

    • Options
    • A. TTL
    • B. MOS
    • C. ECL
    • D. IIL
    • Discuss
    • 3. 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
    • 4. 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
    • 5. Which of the following logic families has the shortest propagation delay?

    • Options
    • A. CMOS
    • B. BiCMOS
    • C. ECL
    • D. 74SXX
    • Discuss
    • 6. 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
    • 7. The TTL HIGH level source current is higher than the LOW level sinking current.

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

    • Options
    • A. E-MOSFET
    • B. 7400
    • C. quad
    • D. AC00
    • Discuss
    • 9. 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
    • 10. Ten TTL loads per TTL driver is known as:

    • Options
    • A. noise immunity
    • B. fan-out
    • C. power dissipation
    • D. propagation delay
    • Discuss


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