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Home ‣ Digital Electronics ‣ Logic Families and Their Characteristics Comments
- Question
The high input impedance of MOSFETs:
Options- A. allows faster switching
- B. reduces input current and power dissipation
- C. prevents dense packing
- D. creates low-noise reactions
- Correct Answer
- reduces input current and power dissipation
- 1. How does the 4000 series of CMOS logic compare in terms of speed and power dissipation to the standard family of TTL logic?
Options- A. more power dissipation and slower speed
- B. more power dissipation and faster speed
- C. less power dissipation and faster speed
- D. less power dissipation and slower speed Discuss
- 2. How can ECL have both a NOR and an OR output?
Options- A. ECL does not have this feature.
- B. They are simply the inverse of each other. Discuss
- 3. What is the advantage of using low-power Schottky (LS) over standard TTL logic?
Options- A. more power dissipation
- B. less power dissipation
- C. cost is less
- D. cost is more Discuss
- 4. When is a level-shifter circuit needed in interfacing logic?
Options- A. A level shifter is always needed.
- B. A level shifter is never needed.
- C. when the supply voltages are the same
- D. when the supply voltages are different Discuss
- 5. Using the schematic diagram of a TTL NAND gate, determine the state of each transistor (ON or OFF) when all inputs are high.
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
- 6. What is the difference between the 54XX and 74XX series of TTL logic gates?
Options- A. 54XX is faster.
- B. 54XX is slower.
- C. 54XX has a wider power supply and expanded temperature range.
- D. 54XX has a narrower power supply and contracted temperature range. Discuss
- 7. Special handling precautions should be taken when working with MOS devices. Which of the following statements is not one of these precautions?
Options- A. All test equipment should be grounded.
- B. MOS devices should have their leads shorted together for shipment and storage.
- C. Never remove or insert MOS devices with the power on.
- D. Workers handling MOS devices should not have grounding straps attached to their wrists. Discuss
- 8. Can a 74HCMOS logic gate directly connect to a 74ALSTTL gate?
Options- A. Yes
- B. No Discuss
- 9. How is the speed?power product of a logic family determined?
Options- A. The propagation delay in µs is multiplied by the power dissipation in mW.
- B. The propagation delay in ms is multiplied by the power dissipation in µW.
- C. The propagation delay in ns is multiplied by the power dissipation in mW.
- D. The propagation delay in ns is multiplied by the power dissipation in µW. Discuss
- 10. As a general rule, the lower the value of the speed?power product, the better the device because of its:
Options- A. long propagation delay and high power consumption
- B. long propagation delay and low power consumption Discuss
Logic Families and Their Characteristics problems
Search Results
Correct Answer: less power dissipation and slower speed
Correct Answer: They are simply the inverse of each other.
Correct Answer: less power dissipation
Correct Answer: when the supply voltages are different
Correct Answer: Q1-OFF, Q2-ON, Q3-OFF, Q4-ON
Correct Answer: 54XX has a wider power supply and expanded temperature range.
Correct Answer: Workers handling MOS devices should not have grounding straps attached to their wrists.
Correct Answer: Yes
Correct Answer: The propagation delay in ns is multiplied by the power dissipation in mW.
Correct Answer: long propagation delay and low power consumption
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