Name Graphic symbol Algebraic function Truth table
AND F = x . y 全为1输出1,否则输出0
OR F = x + y 有一个1输出1,否则输出0
INV(invert) F = x’ 取反输出
Buffer F = x 输出本身
NAND F = (xy)’ 非与门,与门再取反
NOR F = (x + y)’ 非或门,或门取反