A flip-flop is a basic component of digital electronics. This kind of circuit has two stable states and is frequently used in storing one bit of information. Various flip-flops such as SR (Set-Reset), D (Data or Delay), JK and T belong to this category. Each category has distinct features and functions within digital circuits. Simply put, a flip-flop can preserve some binary value (0 or 1) changing its output according to input signals received. Hence, it resembles computer memory cell that retains certain data until it gets altered by new ones.
JK Flip-Flop is a gated SR flip-flop which has an additional clock input. It prevents the invalid output that may be obtained when both the inputs are 1. Whereas D Flip-Flop is a modified SR flip-flop with an added inverter between the inputs, ensuring that the inputs are always complementary and eliminating the invalid state.
Read more about flip-flops.
Conversion of J-K Flip-Flop into D Flip-Flop
Step-1: We construct the characteristic table of D flip-flop and excitation table of JK flip-flop. 
Step-2: Using the K-map we find the boolean expression of J and K in terms of D and Qn.
J = D
K = D' Step-3: We construct the circuit diagram of the conversion of JK flip-flop into D flip-flop.
Difference between JK Flip Flop & D Flip Flop
JK Flip-Flop | D Flip-Flop |
|---|---|
The JK flip flop has two inputs, J (set) and K (reset), which determine what it does. | Also called DFF, data or delay flip flop, has only one data input (D) and a clock input. |
It has two inputs, J and K, as well as a clock input. | At the rising or falling edge of the clock signal the output of a DFF switches to the value of D input. |
Based on the inputs J and K, JK flip flop can toggle its output between stable states (0 and 1). | Because it acts according to clock signal during storage and transfer, it is suitable for synchronization and storage purposes. |
Because of its ability to function as either toggle FFs or SR_FFs or data FFs depending on input state, it has a more complicated truth table than any other type of flip flop. | DFF truth table is simpler than JKFF because it merely duplicates its input to output. |