NAND GateThe NAND gate is a special type of logic gate in the digital logic circuit. The NAND gate is the universal gate. It means all the basic gates such as AND, OR, and NOT gate can be constructed using a NAND gate. The NAND gate is the combination of the NOTAND gate. The output state of the NAND gate will be low only when all the inputs are high. Simply, this gate returns the complement result of the AND gate. The logic or Boolean expression for the NAND gate is the complement of logical multiplication of inputs denoted by a full stop or a single dot as (A.B)'=Y The value of Y will be true when any one of the input is set to 0. Types of Digital Logic AND GateThe NAND gate is also classified into three types based on the input it takes. These are the following types of AND gate: The 2input NAND GateThis is the simple formation of the NAND gate. In this type of NAND gate, there are only two input values and an output value. There are 2^{2}=4 possible combinations of inputs. The truth table and logic design are given below: Logic Design Truth Table The 3input NAND GateUnlike the 2input NAND gate, the 3input NAND gate has three inputs. The Boolean expression of the logic NAND gate is defined as the binary operation dot(.). The NAND gate can be cascaded together to form any number of individual inputs. There are 2^{3}=8 possible combinations of inputs. The truth table and logic design are given below: Logic Design Truth Table The Multiinput NAND GateJust like AND, NOT, and OR gate, we can also form ninput NAND gate. If the number of inputs required is odd, any "unused" input can be held high by directly connecting it to the power supply using high "suitable" pullup resistors. There is the following expression of the 4input NAND gate: Y=((A.B).(C.D))' In simple words, it is expressed as: Y=A NAND B NAND C NAND D Logic Design Truth Table AND gate using NAND gateOR gate using NAND gate.NOT gate using NAND gate
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