Consider an SR flip-flop realized with two cross-coupled NAND gates. If the…
Consider an SR flip-flop realized with two cross-coupled NAND gates. If the input sequence is 00, 11 then the output sequence will be___.
Answer: A. 11, 00, 11, 00 — The next state of the SR flip flop depends on the previous state if the current inputs are S=R=1. If the previous input was S=R=0 then Q=1= Q'. Next if the…
- A.
11, 00, 11, 00
- B.
00, 11, 00, 11
- C.
11, 00, 10, 01
- D.
00, 11, 11, 00
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Correct answer: A
The next state of the SR flip flop depends on the previous state if the current inputs are S=R=1.
If the previous input was S=R=0 then Q=1= Q'.
Next if the state changes to S=R=1 then both inputs to the NAND gates are 1s which turn Q=0= Q'.
If one of the inputs is 0 then output of NAND gate is 1 i. e Q=1= Q'.
Now, both inputs to NAND gates are 1 which make turn Q=0= Q' again