Contextual Info: TYPES SN54S281, SN74S281 4-BIT PARALLEL BINARY ACCUMULATORS FEBUARY 1974 —REVISED DECEMBER 1983 S N 5 4 S 2 8 1 . . . J OR W PACKAGE Full 4-Bit Binary Accumulator in a Single Package S N 7 4 S 2 8 1 . . . D W , J OR N PACKAGE TO P VIE W 15 Arithmetic/Logic-Type Operations: