Important Digital Logic and Design Short Questions
Chapter: 25
Question 1:
Describe the operation of a Master-Slave flip-flop during the positive half of the clock cycle.
Answer:
During the positive half-cycle, the Master flip-flop is enabled and the Slave flip-flop is disabled, holding its output steady.
Chapter: 25
Question 2:
What happens during the negative half of the clock cycle in a Master-Slave flip-flop?
Answer:
The Master flip-flop is disabled and the Slave flip-flop is enabled, allowing it to update its output based on the Master’s state.
Chapter: 25
Question 3:
What is the primary difference between retriggerable and nonretriggerable One-Shots?
Answer:
Retriggerable One-Shots can be retriggered while in an unstable state, whereas nonretriggerable ones must return to a stable state before being retriggered.
Chapter: 25
Question 4:
How is the output pulse duration of a nonretriggerable One-Shot determined?
Answer:
The output pulse duration is fixed and is determined by the RC time constant, regardless of the trigger pulse duration.
Chapter: 25
Question 5:
What role does the time constant RC play in a One-Shot multi-vibrator?
Answer:
The RC time constant determines the duration of the unstable state of the One-Shot, affecting how long the output pulse lasts.
Chapter: 25
Question 6:
Explain what propagation delay in flip-flops refers to.
Answer:
Propagation delay is the time interval between when an input is applied and when the output changes accordingly.
Chapter: 25
Question 7:
What is meant by the set-up time of a flip-flop?
Answer:
Set-up time is the minimum duration that the input signal must remain stable before a clock transition for reliable operation.
Chapter: 25
Question 8:
Define hold time in the context of flip-flops.
Answer:
Hold time is the minimum period after the clock transition during which the input signal must remain stable for proper operation.
Chapter: 25
Question 9:
What is the significance of maximum clock frequency in flip-flops?
Answer:
Maximum clock frequency is the highest rate at which the flip-flop can reliably operate without failing to respond to fast clock transitions.
Chapter: 25
Question 10:
How is power dissipation calculated for a flip-flop?
Answer:
Power dissipation is calculated as P = Vcc x Icc, where Vcc is the supply voltage and Icc is the current drawn by the flip-flop.