The J-K flip-flop is the most versatile of the basic flip-flops. The J & K inputs alone cannot cause a transition, but their values at the time of the PGT determine the output according to the truth table. This article deals with the basic flip flop circuits like SR Flip Flop,JK Flip Flop,D Flip Flop,and T Flip Flop with truth tables and their circuit symbols. Flip-flops, JK flip-flops explained, working demos of edge-triggering, synchronous and asynchronous operation.

Flip flop is a sequential circuit which generally samples its inputs and changes its outputs only at particular instants of time and not continuously. J and K are synchronous inputs that determine the Flip Flops behavior when a clock transition arrives on the clock input, so again we’re going to have a clock coming in and since we have these zero here, that’s telling us this one is actually going to clock when the signal goes on the negative edges. This dictates the truth table for synchronous operation for a JK Flip Flop and as in the data type or the D-Type, if you have a value coming in on either the R or the D, it will override whatever the JK is doing. A flip-flop circuit can be constructed from two NAND gates or two NOR gates.

The basic building blocks of sequential logic circuits are flip flops. The behavior of a flip flops can be described by a characteristic table which is basically a truth table. Basically, a JK flip flop is a combination of a D and T flip flop (or more accurately, a D and T flip flop are a simplification of a JK flip flop). J-K Flip-Flop: When the clock triggers, the value remembered by the flip-flop toggles if the J and K inputs are both 1, remains the same if they are both 0; if they are different, then the value becomes 1 if the J (Jump) input is 1 and 0 if the K (Kill) input is 1. Their exact behavior depends on the flip-flop; the above tables summarize their behavior. Master Slave JK flipflop-interactive digital circuits and Truth Tables. Master-Slave JK Flip Flop digital logic circuit, with Boolean function and truth table.

### Sequential Circuits

Table 1 is the Truth-Table of a Negative-Edge-Triggered J-K Flip-flop. Inputs J and K of each Flip-flop are always 1, according to the Truth-Table, the Flip-flop changes its state upon each H to L transition of its CLOCK. The three basic types are introduced here: S-R, J-K and D. The operation and truth table for a negative edge-triggered flip-flop are the same as those for a positive except that the falling edge of the clock pulse is the triggering edge. The standard symbol for the J-K FF is shown in view A of figure 3-18. Figure 3-18. – J-K flip-flop: A. Standard symbol; B. Truth Table; C. Timing diagram. Two flip-flops are needed to represent the four states and are designated Q0Q1. The table is now arranged in a different form shown in Table 11, where the present state and input variables are arranged in the form of a truth table. Remember, the excitable for the JK flip-flop was derive in Table 1. Table 10. On the negative (falling) edge of the clock signal (CLK), the J-K Flip-Flop block outputs Q and its complement,!Q, according to the following truth table. These truth tables describe how the outputs of a given flip flop will be determined by a combination of inputs. Not shown are Preset and Clear inputs, which will cause the Q outputs to be set high or low, respectively. JK Flip-Flop Q (t) Q (t+1) J K 0 0 0 X 0 1 1 X 1 0 X 1 1 1 X 0 X Don’t Care.

### Introduction To Flip Flops: D And T

The JK Flip Flop is the most widely used flip flop. It is considered to be a universal flip flop circuit. The sequential operation of the JK Flip Flop is same as for the RS flip flop with the same SET.