Integrated-Circuit Logic Families problems
- 1. The propagation delay of standard TTL gates is approximately ________.
Options- A. 2 µs
- B. 1 µs
- C. 4 ns
- D. 10 ns Discuss
Correct Answer: 10 ns
- 2. The 74F-Fast TTL integrated-circuit fabrication technique uses reduced interdevice ________ to achieve reduced propagation delays.
Options- A. noise
- B. resistance
- C. capacitance
- D. inductance Discuss
Correct Answer: capacitance
- 3. ________ TTL allows three possible output states.
Options- A. Triswitch
- B. Triinput
- C. Tristate
- D. Trident Discuss
Correct Answer: Tristate
- 4. One advantage that MOSFET transistors have over bipolar transistors is ________.
Options- A. high input impedance
- B. higher switching speed
- C. low input impedance
- D. reduced propagation delay Discuss
Correct Answer: high input impedance
- 5. When the output of a standard TTL gate is HIGH, it can ________.
Options- A. sink 16 mA of current from the attached input gates
- B. source 400 µA of current to no more than 10 attached gates
- C. source 16 mA of current to no more than 10 attached gates
- D. sink a maximum of 400 µA from no more than 10 load gates Discuss
Correct Answer: source 400 µA of current to no more than 10 attached gates
- 6. Totem-pole outputs ________ be connected ________ because ________.
Options- A. can, in parallel, sometimes higher output current is required
- B. cannot, together, if the outputs are in opposite states excessively high currents can damage one or both of the 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 of the devices
- 7. A logic probe is placed on the input of a digital circuit and the probe lamp blinks slowly, indicating ________.
Options- A. that an open or bad logic level exists
- B. a high level output
- C. a high-frequency pulse train
- D. that the supply voltage is low Discuss
Correct Answer: a high-frequency pulse train
- 8. The lower transistor of a totem-pole output is saturated when the gate output is ________.
Options- A. overdriven
- B. HIGH
- C. LOW
- D. malfunctioning Discuss
Correct Answer: LOW
- 9. Several manufacturers have developed logic that combines the best features of TTL and CMOS. This is called ________.
Options- A. 12L
- B. BiCMOS
- C. 74ACT
- D. 74HCT Discuss
Correct Answer: BiCMOS
- 10. ________ output levels would not be a valid LOW for a TTL gate.
Options- A. 0.2 V
- B. 0.3 V
- C. 0.5 V
- D. All of the above. Discuss
Correct Answer: All of the above.
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