In an SR latch made by cross-coupling two NAND gates, if both S and R inputs are set to 0, then it will result in
(A)
Q = 0, Q\’ = 1
(B)
Q = 1, Q\’ = 0
(C)
Q = 1, Q\’ = 1
(D)
Indeterminate states
Answer: (C)
Explanation:
When both R and S are set as 0, we will get both Q and Q\’ as 1. This output will be permanent and it is not dependent on any order of occurrence it only depends on the input values [NO RACE CONDITION]. But after this state if we make R=S=1, the output will be indeterminate depending on which NAND gate processes first (either Q or Q\’ will become 0 but we can\’t determine which [RACE CONDITION] and it will lead to an indeterminate state. So, option (C) is correct.
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