View mc74hct157a datasheet:

MOTOROLA SEMICONDUCTOR TECHNICAL DATA MC74HCT157A Quad 2-Input Data Selector/Multiplexer with N SUFFIX LSTTL Compatible Inputs PLASTIC PACKAGE 16 High–Performance Silicon–Gate CMOS CASE 648–08 1 The MC74HCT157A is identical in pinout to the LS157. This device may be used as a level converter for interfacing TTL or NMOS outputs to High Speed CMOS inputs. D SUFFIX This device routes 2 nibbles (A or B) to a single port (Y) as determined by 16 SOIC PACKAGE the Select input. The data is presented at the outputs in noninverted form. A CASE 751B–05 1 high level on the Output Enable input sets all four Y outputs to a low level. The HCT157A is similar in function to the HC257 which has 3–state ORDERING INFORMATION outputs. MC74HCTXXXAN Plastic • Output Drive Capability: 10