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Logic Gates

The waveforms...

Question

The waveforms A and B given below are given as input to a NAND gate. Then, its logic output $y$ is

for

t_{1}

t_{2}; y = 0

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for

t_{2}

t_{3}; y = 1

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for

t_{3}

t_{4}; y = 1

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for

t_{4}

t_{5}; y = 0

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for

t_{5}

t_{6}; y = 0

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Solution

The correct option is C for $t_{3}$ to $t_{4}; y = 1$
Time A B $Y = ¯ ¯¯¯¯¯¯ ¯ A B$
$t_{1}$ 1 0 1
$t_{2}$ 1 1 0
$t_{3}$ 1 1 0
$t_{4}$ 0 1 1
$t_{5}$ 1 0 1
$t_{6}$ 1 1 0
NAND gate is the combination of AND and NOT gate and the output of the two inputs (A and B) NAND gate is $Y = ¯ ¯¯¯¯¯¯ ¯ A B$
Here, the truth table for the NAND gate will be the following table,
(note 1 for high signal and 0 for low signal)

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