Logic Families and Their Characteristics problems
- 1. 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
Correct Answer: Workers handling MOS devices should not have grounding straps attached to their wrists.
- 2. Can a 74HCMOS logic gate directly connect to a 74ALSTTL gate?
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 3. 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
Correct Answer: The propagation delay in ns is multiplied by the power dissipation in mW.
- 4. 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
Correct Answer: long propagation delay and low power consumption
- 5. Which logic family is characterized by a multiemitter transistor on the input?
Options- A. ECL
- B. CMOS
- C. TTL
- D. None of the above Discuss
Correct Answer: TTL
- 6. From the following specifications determine the fan-out for the logic family.
Options- A. HIGH state is 16, LOW state is 8
- B. HIGH state is 8, LOW state is 16
- C. HIGH state is 4, LOW state is 8
- D. HIGH state is 8, LOW state is 4 Discuss
Correct Answer: HIGH state is 8, LOW state is 16
- 7. What is unique about TTL devices such as the 74SXX?
Options- A. These 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.
- B. The gate transistors are silicon (S), and the gates therefore have lower values of leakage current.
- C. The S denotes the fact that a single gate is present in the IC rather than the usual package of 2?6 gates.
- D. The S denotes a slow version of the device, which is a consequence of its higher power rating. Discuss
Correct Answer: These 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.
- 8. Why must CMOS devices be handled with care?
Options- A. so they don't get dirty
- B. because they break easily
- C. because they can be damaged by static electricity discharge Discuss
Correct Answer: because they can be damaged by static electricity discharge
- 9. Totem-pole outputs ________ be connected ________ because ________.
Options- A. can, in parallel, sometimes higher current is required
- B. cannot, together, if the outputs are in opposite states excessively high currents can damage one or both devices
- C. should, in series, certain applications may require higher output voltage
- D. can, together, together they can handle larger load currents and higher output voltages Discuss
Correct Answer: cannot, together, if the outputs are in opposite states excessively high currents can damage one or both devices
- 10. A TTL totem-pole circuit is designed so that the output transistors:
Options- A. are always on together
- B. provide linear phase splitting
- C. provide voltage regulation
- D. are never on together Discuss
Correct Answer: are never on together
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