View mc74hc242 datasheet:

MOTOROLA SEMICONDUCTOR TECHNICAL DATA MC74HC242 Quad 3-State Bus Transceiver High–Performance Silicon–Gate CMOS The MC74HC242 is identical in pinout to the LS242. The device inputs N SUFFIX are compatible with Standard CMOS outputs; with pullup resistors, they PLASTIC PACKAGE 14 are compatible with LSTTL outputs. CASE 646–06 This quad bus transceiver is designed for asynchronous two–way 1 communications between data buses. The states of the Output Enables (A–to–B Enable and B–to–A Enable) determine both the direction of data ORDERING INFORMATION flow (from A to B or from B to A) and the modes of the Data Ports (input, MC74HCXXXN Plastic output, or high–impedance). • Output Drive Capability: 15 LSTTL Loads • Outputs Directly Interface to CMOS, NMOS and TTL FUNCTION TABLE