The M88MR5DB01 is a Gen1 DDR5 Multiplexed Data Buffer (MDB) supporting data rates up to 8800 MT/s. The MDB chip buffers and re-drives data signals from the memory controller or DRAM devices. It incorporates a dual-nibble host interface that operates at twice the speed of the DRAM interface. The DRAM side features four nibbles, with two allocated to each pseudo-channel. The MDB efficiently multiplexes two DRAM-side DQ signals into one host-side DQ signal.

Designed to work in conjunction with the Multiplexed Registering Clock Driver (MRCD), the MDB plays a crucial role in DDR5 MRDIMMs/MCRDIMMs. Each MRDIMM/MCRDIMM is equipped with one MRCD and ten MDBs. This configuration enables the MRDIMM/MCRDIMM module to concurrently access two DRAM memory ranks through the MDB chips, resulting in a doubling of bandwidth to address the demands of high-load applications.