The CD4008B types consist of four full-adder stages with fast look-ahead carry provision from stage to stage Circuitry is included to provide a fast ``parallel-carry-out'' bit to permit high-speed operation in arithmetic sections using several CD4008B's CD4008B inputs include the four sets of bits to be added A1 to A4 and B1 to B4 in addition to the ``Carry in'' bit from a previous section CD4008B outputs include the four sum bits S1 and S4 in addition to the high-speed ``parallel-carry-out'' which may be utilized at a succeeding CD4008B section