Question
Download Solution PDFWhich of the following is correct for a D-type flip-flop ?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFD flip flop :
D flip flop has only one input terminal. The output of the D flip flop will be the same as the input. Hence, it is used in delay circuits.
The circuit is as shown below.
Logic symbol:
Truth table:
|
D |
Qn (Present state) |
Qn+1 (Next state) |
|
0 |
0 |
0 |
|
0 |
1 |
0 |
|
1 |
0 |
1 |
|
1 |
1 |
1 |
Conclusion: The Q output is SET as soon as the D input goes HIGH, and the output is RESET as soon as the D input goes LOW.
Important Points
The D flip flop may be obtained from an S-R flip flop by just putting one inverter between the S and R as shown in the figure below.
S = R̅
∴ The one input RS flip flop is the D flip flop.
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