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- Question
A Schmitt trigger:
Options- A. has two trip points
- B. is a zero crossing detector
- C. has positive feedback
- D. has two trip points and positive feedback
- Correct Answer
- has two trip points and positive feedback
- 1. Why does the data sheet for the 7476 only give a minimum value for the clock pulse width (both HIGH and LOW)?
Options- A. nominal value
- B. best-case condition
- C. worst-case condition Discuss
- 2. The purpose of a pull-up resistor is to keep a terminal at a ________ level when it would normally be at a ________ level.
Options- A. LOW, float
- B. HIGH, float
- C. clock, float
- D. pulsed, float Discuss
- 3. Decoupling capacitors should be tied from VCC on one device to ground on a different device.
Options- A. True
- B. False Discuss
- 4. Is the propagation delay from the clock to the output for the 7476 the same as the delay from the set or reset to the output?
Options- A. yes
- B. no Discuss
- 5. Which of the following circuit parameters would be most likely to limit the maximum operating frequency of a flip-flop?
Options- A. setup and hold time
- B. clock pulse HIGH and LOW time
- C. propagation delay time
- D. clock transition time Discuss
- 6. A Schmitt trigger has VT+ = 2.0 V and VT? = 1.2 V. What is the hysteresis voltage of the Schmitt trigger?
Options- A. 0.4 volt
- B. 0.6 volt
- C. 0.8 volt
- D. 1.2 volts Discuss
- 7. Why should a LED be pulled LOW from a logic gate rather than pulled HIGH?
Options- A. LOW-level current is smaller.
- B. LOW-level current is larger.
- C. HIGH-level current is larger.
- D. LOW-level current is smaller and HIGH-level current is larger. Discuss
- 8. Define a race condition for a flip-flop.
Options- A. The inputs to a trigger device are changing slightly before the active trigger edge.
- B. The inputs to a trigger device are changing slightly after the active trigger edge.
- C. The inputs to a trigger device are changing at the same time as the active trigger edge. Discuss
- 9. Which of the following flip-flop timing parameters indicates the time it takes a Q output to respond to a Cp input?
Options- A. ts, th
- B. tPHL, tPLH
- C. tw (L), tw (H)
- D. fmax Discuss
- 10. The main concern when using a pull-down resistor is:
Options- A. the low power dissipation of the resistor
- B. it will keep a floating terminal LOW
- C. the high power dissipation of the resistor
- D. it will cause false triggering Discuss
Digital Design problems
Search Results
Correct Answer: worst-case condition
Correct Answer: HIGH, float
Correct Answer: False
Correct Answer: yes
Correct Answer: propagation delay time
Correct Answer: 0.8 volt
Correct Answer: LOW-level current is larger.
Correct Answer: The inputs to a trigger device are changing at the same time as the active trigger edge.
Correct Answer: tPHL, tPLH
Correct Answer: the high power dissipation of the resistor
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