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Home Electronics Standard Logic Devices (SLD) Comments

  • Question
  • What quantities must be compatible when interfacing two different logic families?


  • Options
  • A. only the currents
  • B. both the voltages and the currents
  • C. only the voltages
  • D. both the power dissipation and the impedance

  • Correct Answer
  • both the voltages and the currents 


  • Standard Logic Devices (SLD) problems


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    • 1. A TTL totem pole circuit is designed so that the output transistors are:

    • Options
    • A. always on together
    • B. providing phase splitting
    • C. providing voltage regulation
    • D. never on together
    • Discuss
    • 2. When an IC has two rows of parallel connecting pins, the device is referred to as:

    • Options
    • A. a QFP
    • B. a DIP
    • C. a phase splitter
    • D. CMOS
    • Discuss
    • 3. The problem of interfacing IC logic families that have different supply voltages (VCCs) can be solved by using a:

    • Options
    • A. level-shifter
    • B. tri-state shifter
    • C. translator
    • D. level-shifter or translator
    • Discuss
    • 4. What is the standard TTL noise margin?

    • Options
    • A. 5.0 V
    • B. 0.2 V
    • C. 0.8 V
    • D. 0.4 V
    • Discuss
    • 5. Which of the following summarizes the important features of emitter-coupled logic (ECL)?

    • Options
    • A. negative voltage operation, high speed, 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
    • Discuss
    • 6. A digital logic device used as a buffer should have what input/output characteristics?

    • Options
    • A. high input impedance and high output impedance
    • B. low input impedance and high output impedance
    • C. low input impedance and low output impedance
    • D. high input impedance and low output impedance
    • Discuss
    • 7. The range of a valid LOW input is:

    • Options
    • A. 0.0 V to 0.4 V
    • B. 0.4 V to 0.8 V
    • C. 0.4 V to 1.8 V
    • D. 0.4 V to 2.4 V
    • Discuss
    • 8. The time needed for an output to change as the result of an input change is known as:

    • Options
    • A. noise immunity
    • B. fanout
    • C. propagation delay
    • D. rise time
    • Discuss
    • 9. The use of triggered sweep when using an oscilloscope provides more accuracy in which area?

    • Options
    • A. frequency
    • B. amplitude
    • C. graticule activity
    • D. timing
    • Discuss
    • 10. What is the next step after discovering a faulty gate within an IC?

    • Options
    • A. repair the gate
    • B. resolder the tracks
    • C. replace the IC involved
    • D. recheck the power source
    • Discuss


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