The OR and XOR Gates The OR gate is also a two-input, single-output gate. Unlike the AND gate, the output is 1 when one input, or the other, or both are 1. The OR gate output is 0 only when both inputs are 0. A basic AND gate consists of two inputs and an output. If the two inputs are A and B, the output (often called Q) is “on” only if both A and B are also “on.” In digital electronics, the on state is often represented by a 1 and the off state by a 0. The relationship between the input signals and the output signals is often summarized in a truth table, which is a tabulation of all possible inputs and the resulting outputs. For the AND gate, there are four possible combinations of input states: A=0, B=0; A=0, B=1; A=1, B=0; and A=1, B=1. In the following truth table, these are listed in the left and middle columns. The AND gate output is listed in the right column
The OR and XOR GatesThe OR gate is also a two-input,
single-output gate. Unlike the AND gate,the output is 1 when one
input, or the other, or both are 1. The OR gateoutput is 0 only
when both inputs are 0.
A basic AND gate consists of two inputs and an output. If the
two inputsare A and B, the output (often called Q) is on only if
both A and B arealso on.In digital electronics, the on state is
often represented by a 1 and the off stateby a 0. The relationship
between the input signals and the output signals isoften summarized
in a truth table, which is a tabulation of all possible inputsand
the resulting outputs. For the AND gate, there are four
possiblecombinations of input states: A=0, B=0; A=0, B=1; A=1, B=0;
and A=1, B=1.In the following truth table, these are listed in the
left and middle columns.The AND gate output is listed in the right
column
