Patent ID: 7830179

Claim:
A multi-functional logic gate device comprising: a pull-up switching unit having input switches of a first group being respectively connected to a plurality of input terminals and selection switches of the first group connected to either a selection terminal or a logically inverted selection terminal, the pull-up switching unit electrically connecting the input switches of the first group between a power source and an output terminal to have a single serial or parallel structure according to logic levels of the selection terminal and the inverted selection terminal; and a pull-down switching unit having input switches of a second group being respectively connected to a plurality of input terminals and selection switches of the second group connected to either the selection terminal or the inverted selection terminal, the pull-down switching unit electrically connecting the input switches of the second group in a parallel connection or in a series connection between the output terminal and a ground terminal according to the logic levels of the selection terminal and the inverted selection terminal, wherein the series connection or the parallel connection of the input switches of the second group is complementarily opposite to the series connection or the parallel connection of the input switches of the first group, wherein the multi-functional logic gate is set to operate as a NAND gate or a NOR gate according to logic levels of the selection terminal and the inverted selection terminal.