COMPUTER SCIENCE AND ENGINEERING
DIGITAL LOGIC
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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OR and AND
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AND and NOT
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NOT and OR
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OR and NAND
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Detailed explanation-1: -The NAND gate or “NotAND” gate is the combination of two basic logic gates, the AND gate and the NOT gate connected in series. The NAND gate and NOR gate can be called the universal gates since the combination of these gates can be used to accomplish any of the basic operations.
Detailed explanation-2: -If two NOT gates are connected at the two inputs of a NAND gate, then no current will pass through the gate. This will result in a zero output. As a result the NAND gate will receive no input so the combination will behave like a OR gate. An OR gate can have a number of inputs but only one output.
Detailed explanation-3: -The NAND gate operates as an AND gate followed by a NOT gate. It acts in the manner of the logical operation “and” followed by negation. The output is “false” if both inputs are “true.” Otherwise, the output is “true."
Detailed explanation-4: -The NAND and NOR gates are called universal functions since with either one the AND and OR functions and NOT can be generated. Note: A function in sum of products form can be implemented using NAND gates by replacing all AND and OR gates by NAND gates.
Detailed explanation-5: -The NOR gate is the combination of the NOT-OR gate. The output state of the NOR gate will be high only when all of the inputs are low. Simply, this gate returns the complement result of the OR gate.