Digital Logic Gates

The AND gate

  1. The AND gate is a logic gate that has two or more inputs.
  2. The output of the AND gate is such that the output is a binary 1 if and only if all inputs are binary 1.
  3. If any of the inputs is binary 0 the output will be binary 0.
  4. The standard logic symbol for the AND gate.

    [and1.gif]


  5. The equation at the output of an AND gate is Y=A*B or Y=AB, expresses the output Y in terms of the input variables A and B. It is read, Y equals A and B.
  6. The AND function is designated by the dot between the two input variables A and B.
  7. The AND function is designated by an expression similar to the product of algebraic variables. It is referred to as a Boolean expression for an AND gate.
  8. The truth table for an AND gate.

    [1ttand1.gif]