Gen 5 DDR5 Registering Clock Driver

The RRG5005x-B08 is a registering clock driver (RCD) used on DDR5 RDIMMs. Its primary function is to buffer the Command/Address (CA) bus, chip selects, and clock between the host controller and the DRAMs. The RRG5005x-B08 contains two separate channels, which have some common logic such as clocking, but otherwise operate independently of each other. Each channel has a 7-bit double data rate CA bus input, a single parity input, two chip select inputs, and produces two copies of 14-bit single data rate CA bus outputs, and two copies of the chip select outputs. The RCD has a common clock input and PLL, but produces four separate clock pairs to the DRAM channels.