The RCA CD54/74AC623 and CD54/74ACT623 octal-bus transceivers use the RCA ADVANCED CMOS technology. They are non-inverting, 3-state, bidirectional transceiver-buffers that allow for two-way transmission from "A" bus to "B" bus or "B" bus to "A" bus, depending on the logic levels of the Output Enable (OE_AB,(OE)\_BA) inputs.

The dual Output Enable provision gives these devices the capability to store data by simultaneously enabling OE_AB and (OE)\_BA. Each output reinforces its input under these conditions, and when all other data sources to the bus lines are at high-impedance, both sets of bus lines will remian in their last states.

The CD74AC623 is supplied in 20-lead dual-in-line plastic packages E suffix) and in 20-lead small-outline packages (M, M96, and NSR suffixes).