The PI74ALVCH16863 is an 18-bit noninverting transceiver designed for synchronous communication between data buses. The controlfunction implementation minimizes external timing requirements. The PI74ALCH16863 can be used as two 9-bit transceivers or one 18bit transceiver.They allow data transmission from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the output-enable (OEAB or OEBA) inputs. To ensure the high-impedance state during power up or power down, OE should be tied to Vcc through a pull-up resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.