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Step 1 of4
and a combinational circuit.
The truth table is same as the SR flip-flop except the way it is clocked is quite different. S, R applied directly
to the Master flip-flop, the outputs of master flip-flop acts as the control inputs to the slave flipflop. The
inverted clock pulse of the slave makes it responsible to respond to the control signals produced by the
master flip-flop.
Step 2 of 4
The truth table of the SR flip-flop is as follows:
Table 1
Extemal | Present | Next | Flip-flop
Inputs State State | Input
s R Q | Qe
0 0 0 0
0 0 1 1
0 1 0 0
0 1 1 0
1 0 0 1
1 0 1 1
1 1 0 X
1 1 1 X
Step 3 of 4
Convert D flip flop into SR flip-flop and draw the Karnaugh map for the input, p
RQ,
S
Figure 1
00
01
11 10
0
0 1 3 2
1 X X p
+ 5 7 6
The relation between between the D flip flop and SR flip-flop is,
D=S+RQ,
Step 4 of 4
Draw the following designed circuit:
Figure 2
Therefore, designed the Master Slave SR flip-flop using single 74X74 and a combinational logic.
7.09DP
Yes, itis possible to build a master slave SR flip-flop using a single 74X74 positive edge triggred flip-flop