We discussed in previous post ( Digital computer circuits and Gates ) about that logical operators implemented by the gates like AND, OR and NOT. NAND gate is a universal gate because any function of electronic circuits can be done by using this gate, combination of AND, OR, NOT gates. NAND is easy to built because it is cheaper than the other gates in addition to that more complex integrated circuits can be built by using NAND gates instead of the other common gates.
This is a true table illustrates NAND gate.
x y x NAND y
0 0 1
0 1 1
1 0 1
1 1 0
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