The circuit in figure-2 is called flip flop only when clock The circuit acts as flip flop which is shown in the figure-2. When the Enable pin in figure-1 is replaced with clock input then We have seen in figure-1 that, output changes when enable signal is high and ➨Between t1 and t2, E = 1 and hence changing the S/R will affect the output accordingly. ➨Between t0 and t1, E = 0 so changing the S and R inputs do not affect the output. In actual circuits, the enable input can either be active high or low, and may be named ENABLE, CLK, or CONTROL.Ī typical operation of the latch is shown in the timing diagram. ➨When E = 0, the latch remains in its previous state regardless of the S and R inputs. ➨When E = 1, the circuit behaves like the normal NAND implementation of the SR latch except that the S and R inputs are active The figure-1 depicts SR latch with enable using NAND Gates. It mentions examples of SR latch with enable and SR flip flop in order to provide comparison between latch and flip flop. This page compares latch vs flip flop and mentions difference between latch and flip flop. The conversion table, the K-map for D in terms of J, K and Qp and the logic diagram showing the conversion from D to JK are given in the figure below.Latch vs flip flop-Difference between latch and flip flop J, K and Qp make eight possible combinations, as shown in the conversion table below. In this conversion, D is the actual input to the flip flop and J and K are the external inputs. The four combination conversion table, the K-maps for J and K in terms of D and Qp, and the logic diagram showing the conversion from JK to D are given below. J and K are expressed in terms of D and Qp. JK Flip Flop to T Flip Flopĭ is the external input and J and K are the actual inputs of the flip flop. The conversion table, K-maps, and the logic diagram are given below. J and K are expressed in terms of T and Qp. Four combinations are produced with T and Qp. J and K are the actual inputs of the flip flop and T is taken as the external input for conversion.
The logic diagram showing the conversion from D to SR, and the K-map for D in terms of S, R and Qp are shown below. But, since the combination of S=1 and R=1 are invalid, the values of Qp+1 and D are considered as “don’t cares”. Eight possible combinations are achieved from the external inputs S, R and Qp. SR Flip Flop to D Flip Flopĭ is the actual input of the flip flop and S and R are the external inputs.
The four combinations, the logic diagram, conversion table, and the K-map for S and R in terms of D and Qp are shown below. JK Flip Flop to SR Flip FlopĪs shown in the figure, S and R are the actual inputs of the flip flop and D is the external input of the flip flop. Thus the outputs are considered invalid and the J and K values are taken as “don’t cares”. The outputs for the combinations of S=1 and R=1 are not permitted for an SR flip flop. For each combination, the corresponding Qp+1 outputs are found ut. For two inputs, S and R, eight combinations are made. The logic diagram is shown below.Ī conversion table is to be written using S, R, Qp, Qp+1, J and K. Thus, the values of J and K have to be obtained in terms of S, R and Qp. As shown in the logic diagram below, J and K will be the outputs of the combinational circuit. S and R will be the external inputs to J and K. This will be the reverse process of the above explained conversion. That is, the values of S and R that are required to change the state of the flip flop from Qp to Qp+1 are written. The table is then completed by writing the values of S and R required to get each Qp+1 from the corresponding Qp. Qp+1 simply suggests the future values to be obtained by the JK flip flop after the value of Qp. For each combination of J, K and Qp, the corresponding Qp+1 states are found. The present state is represented by Qp and Qp+1 is the next state to be obtained when the J and K inputs are applied.įor two inputs J and K, there will be eight possible combinations. The truth tables for the flip flop conversion are given below. As shown in the logic diagram below, S and R will be the outputs of the combinational circuit. In this post, the following flip flop conversions will be explained.Īs told earlier, J and K will be given as external inputs to S and R. Thus, the output of the actual flip flop is the output of the required flip flop. If a JK Flip Flop is required, the inputs are given to the combinational circuit and the output of the combinational circuit is connected to the inputs of the actual flip flop. In this article, let’s learn about flip flop conversions, where one type of flip flop is converted to another type.įor the conversion of one flip flop to another, a combinational circuit has to be designed first.