MC54/74F382

Signals MC54/74F382 applied to the Select inputs S0S2 determine the mode of operation, as indicated in the Function Select Table. An extensive listing of input and output levels is shown in the Truth Table. The MC54/74F382 performs the arithmetic functions for either active HIGH or active LOW operands, with output levels in the same convention. In the Subtract operating modes, it is necessary to force a carry (HIGH for active HIGH operands, LOW for active LOW operands) into the Cn input of the least significant package. Ripple expansion is illustrated in Figure 1. The overflow output OVR is the Exclusive-OR of Cn + 3 and Cn+4; a HIGH signal on OVR indicates overflow in twos complement operation. MC54/74F382 delays for Figure 1 are given in Figure 2.