When more than two variables are to be Ex-ORed, a number of two input EX-OR gates will be used. Three or more variable EX-OR gates do not exist. A 2-input EX-OR circuit is sometimes called a modulo-2 adder or a half adder because the possible carry bit has not been taken, resulting from an addition of two preceding bits. The main property of an EX-OR gate is that can perform modulo-2 addition. ![]() It should be noted that the same Ex-OR Truth table applies when adding two binary digits(bits). It means Output is 1 when inputs are not equal. The circuit of the EX-OR gate is also called an inequality comparator or detector because it produces output only when the two inputs are different. The operation of EX-OR gate is denoted by Ꚛ (plus sign surrounded by a circle). ![]() The EX-Or gate has only two inputs, there are no 3 or 4 input EX-or gates. ![]() The Equivalent circuit and Symbol of EXOR (XOR) gate
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