1. A logic circuit including as its basic element PASS transistors, wherein each PASS transistor comprises an input lead, an output lead and a control lead for controlling the passing of signals from said input lead to said output lead, said logic circuit comprising: an output node connected to said output leads; at least two PASS transistors; means for supplying a first input function to said input lead of one of said transistors; means for supplying a second input function to said input lead of another of said transistors; and means for supplying selected control signals to said control leads of said transistors, to generate on said output node a selected output function related to said first and/or second input functions; wherein said first input function is the reference voltage V.sub.SS, said second input function is B, one of said selected control signals is A, another of said selected control signals is A, and said structure thereby represents an AND function.