KK74ACT157 Overview
KK74ACT157 Quad 2-Input Data Selector/Multiplexer High-Speed Silicon-Gate CMOS The KK74ACT157 is identical in pinout to the LS/ALS157, HC/HCT157. The KK74ACT157 may be used as a level converter for interfacing TTL or NMOS outputs to High Speed CMOS inputs. This device routes 2 nibbles (A or B) to a single port (Y) as determined by the Select input.