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Which of the following is correct for a D latch?
- a)The output toggles if one of the inputs is held HIGH
- b)Q output follows the input D when the enable is HIGH
- c)Only one of the inputs can be HIGH at a time
- d)The output complement follows the input when enabled
Correct answer is option 'B'. Can you explain this answer?
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Which of the following is correct for a D latch?a)The output toggles i...
The correct answer is option 'B': Q output follows the input D when the enable is HIGH.
A D latch is a basic form of latch that can store a single bit of information. It has two inputs, D (data input) and E (enable input), and two outputs, Q (output) and Q' (complement output).
The operation of a D latch can be understood by considering its truth table:
From the truth table, it can be observed that when the enable input E is HIGH (1), the output Q follows the input D. This means that the value of Q will be the same as the input D. On the other hand, when the enable input E is LOW (0), the output Q retains its previous state.
In option 'A', the statement "The output toggles if one of the inputs is held HIGH" is not correct. The output of a D latch does not toggle; it either follows the input or retains its previous state based on the enable input.
In option 'C', the statement "Only one of the inputs can be HIGH at a time" is not correct. Both the data input D and enable input E can be HIGH simultaneously.
In option 'D', the statement "The output complement follows the input when enabled" is not correct. The complement output Q' does not follow the input D; its value is determined by the complement of Q.
Therefore, the correct option is 'B': Q output follows the input D when the enable is HIGH.
Explanation:
A D latch is a basic form of latch that can store a single bit of information. It has two inputs, D (data input) and E (enable input), and two outputs, Q (output) and Q' (complement output).
The operation of a D latch can be understood by considering its truth table:
| D | E | Q | Q' |
|---|---|---|---|
| 0 | 0 | Q(t-1) | Q'(t-1) |
| 0 | 1 | Q(t-1) | Q'(t-1) |
| 1 | 0 | Q(t-1) | Q'(t-1) |
| 1 | 1 | D | D' |
From the truth table, it can be observed that when the enable input E is HIGH (1), the output Q follows the input D. This means that the value of Q will be the same as the input D. On the other hand, when the enable input E is LOW (0), the output Q retains its previous state.
In option 'A', the statement "The output toggles if one of the inputs is held HIGH" is not correct. The output of a D latch does not toggle; it either follows the input or retains its previous state based on the enable input.
In option 'C', the statement "Only one of the inputs can be HIGH at a time" is not correct. Both the data input D and enable input E can be HIGH simultaneously.
In option 'D', the statement "The output complement follows the input when enabled" is not correct. The complement output Q' does not follow the input D; its value is determined by the complement of Q.
Therefore, the correct option is 'B': Q output follows the input D when the enable is HIGH.
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Which of the following is correct for a D latch?a)The output toggles i...
If the clock is HIGH then the D flip-flop operates and we know that input equals to output in case of D flip flop. It stores the value on the data line.
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Which of the following is correct for a D latch?a)The output toggles if one of the inputs is held HIGHb)Q output follows the input D when the enable is HIGHc)Only one of the inputs can be HIGH at a timed)The output complement follows the input when enabledCorrect answer is option 'B'. Can you explain this answer?
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Which of the following is correct for a D latch?a)The output toggles if one of the inputs is held HIGHb)Q output follows the input D when the enable is HIGHc)Only one of the inputs can be HIGH at a timed)The output complement follows the input when enabledCorrect answer is option 'B'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about Which of the following is correct for a D latch?a)The output toggles if one of the inputs is held HIGHb)Q output follows the input D when the enable is HIGHc)Only one of the inputs can be HIGH at a timed)The output complement follows the input when enabledCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is correct for a D latch?a)The output toggles if one of the inputs is held HIGHb)Q output follows the input D when the enable is HIGHc)Only one of the inputs can be HIGH at a timed)The output complement follows the input when enabledCorrect answer is option 'B'. Can you explain this answer?.
Which of the following is correct for a D latch?a)The output toggles if one of the inputs is held HIGHb)Q output follows the input D when the enable is HIGHc)Only one of the inputs can be HIGH at a timed)The output complement follows the input when enabledCorrect answer is option 'B'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about Which of the following is correct for a D latch?a)The output toggles if one of the inputs is held HIGHb)Q output follows the input D when the enable is HIGHc)Only one of the inputs can be HIGH at a timed)The output complement follows the input when enabledCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is correct for a D latch?a)The output toggles if one of the inputs is held HIGHb)Q output follows the input D when the enable is HIGHc)Only one of the inputs can be HIGH at a timed)The output complement follows the input when enabledCorrect answer is option 'B'. Can you explain this answer?.
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