The truth table of D flip-flop is given below: Choose exact characteristic equation based on above Truth TableC D Qn+1 O X Qn (Last State) $\uparrow$ 0 0 $\uparrow$ 1 1
Qn+1 = Dn
To determine the exact characteristic equation for a D flip-flop given the truth table, let's analyze the provided information:
| C | D | Qn+1 |
| 0 | X | Qn (Last State) |
| ↑ | 0 | 0 |
| ↑ | 1 | 1 |
- The truth table indicates how the D (data) and C (clock) inputs affect the output Qn+1.
- On the rising edge of the clock kernel (denoted by ↑), the output Qn+1 directly follows the D input.
- When C = 0, the output remains at its last state (Qn).
Based on this truth table:
- During the rising edge of C, if D=0, then Qn+1 = 0.
- During the rising edge of C, if D=1, then Qn+1 = 1.
From this behavior, we can derive the characteristic equation of the D flip-flop:
\(Q_{n+1} = D_n\)
The correct option based on the truth table and the behavior of a D flip-flop is Qn+1 = Dn, which matches the expected behavior where the output follows the input on the clock's rising edge.
Similar Questions
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Reason (R) : It has only one input, when clock is high and D input is also high, the output resets.
Assertion (A) : Asynchronous sequential circuit is also called event driven circuit.
Reason (R) : Event driven circuit does not have clock to trigger change of state. The states are changed by the change in input signal of the previous stage.
Select your answer using the codes given below.
For the circuit shown below consider the two statements :
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Reason (R) : There is a loop in circuit.
Select your answer using the codes given below.
Flip Flop can be used to make :
(a) Latches
(b) Bounce-elimination switches
(c) ADDER
(d) Encoder
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Read the following statements :
(a) In a J-K Flip Flop, if J = K, the resulting Flip Flop is referred to as a T-type Flip Flop
(b) In a J-K Flip Flop, if J ≠ K, the resulting Flip Flop is referred to as a D-type Flip Flop
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1. When K input is low and J input is high, the Q output of the flip flop is reset.
2. When K input is high and J input is low, the output Q of the flip flop is set.
3. When both the inputs K and J are low, the output Q does not change.
4. When both the inputs K and J are high it is possible to set or reset the flip-flop (ie) the output toggle on next positive clock edge.Which one of the following is true ?
Assertion (A) : D-flip-flops are used as buffer register.
Reason (R) : Flip-flops are free from "race-around" condition.
Select your answer using the codes given below :
In the circuit shown below, the output Y1 and Y2 for the given initial condition Y1 = Y2 = 1 and after four input pulses will be
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i. Gate is a combinational logic.
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iii. MSJK FF suffers from race-around.
iv. Counters are sequential circuits.Which is correct ?
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