The MC74AC350/74ACT350 is a specialized multiplexer that accepts a 4-bit word and shifts it 0, 1, 2 or 3 places, as determined by two Select (S0, S1) inputs. For expansion to longer words, three linking inputs are provided for lower-order bits; thus two packages can shift an 8-bit word, four packages a 16-bit word, etc. Shifting by more than three places is accomplished by paralleling the 3-state outputs of different packages and using the Output Enable (OE) inputs as a third Select level. With appropriate interconnections, the AC/ACT350 can perform zero-backfill, sign-extend or end-around (barrel) shift functions. Linking Inputs for Word Expansion 3-State Outputs for Extending Shift Range VCC