View mc74hc157 datasheet:

MOTOROLA SEMICONDUCTOR TECHNICAL DATA MC54/74HC157A Quad 2-Input Data Selectors/Multiplexers High–Performance Silicon–Gate CMOS J SUFFIX CERAMIC PACKAGE The MC54/74HC157A is identical in pinout to the LS157. The device 16 CASE 620–10 inputs are compatible with standard CMOS outputs; with pullup resistors, 1 they are compatible with LSTTL outputs. This device routes 2 nibbles (A or B) to a single port (Y) as determined by N SUFFIX the Select input. The data is presented at the outputs in noninverted form. A PLASTIC PACKAGE 16 high level on the Output Enable input sets all four Y outputs to a low level. CASE 648–08 The HC157A is similar in function to the HC257 which has 3–state outputs. 1 • Output Drive Capability: 10 LSTTL Loads D SUFFIX • Outputs Directly Interface