# Logic Gates – Notes – 1

1. An OR gate produces a HIGH output when any input is HIGH. An AND gate produces a HIGH output only when all inputs are HIGH. A NOT circuit (INVERTER) produces an output that is the opposite logic level compared to the input.

2. A NOR gate is the same as an OR gate with its output connected to an INVERTER. A NAND gate is the same as an AND gate with its output connected to an INVERTER.

3. NAND gates can be used to implement any of the basic Boolean operations. NOR gates can be used likewise.

4. An exclusive-OR circuit has the expression  Its output $x = A\bar{B}+\bar{A}B$ will be HIGH only when inputs Aand Bare at opposite logic levels.

5. An exclusive-NOR circuit has the expression  Its output $x =\bar{ A}\bar{B}+AB$ will be HIGH only when inputs Aand Bare at the same logic level.

6. Each of the basic gates (AND, OR, NAND, NOR) can be used to enable or disable the passage of an input signal to its output.

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