Renesas introduces first client clock driver and Gen 3 RCD for DDR5 DIMMs

Renesas offers complete DDR5 memory interfaces for DIMMs, motherboards, and embedded applications with new driver ICs.

The DDR5 RCD and DDR5 CKD ICs enable the next generation of DIMMs with speeds of up to 6400 and 7200 megatransfers per second (MT/s), respectively, an increase from today’s 5600 MT/s transfer speeds. Renesas’ Gen 3 DDR5 RCD is designed for registered DIMMs (RDIMMs). The CKD supports speeds up to 7200 MT/s and is the first in the industry to interface with small-outline DIMMs (SODIMMs), unbuffered DIMMs (UDIMMs), high-performance gaming DIMMs and memory down applications for client platforms.

“Intel^® Xeon^®-based platforms are designed to support memory intensive usages like predictive analytics that use deep learning and machine learning. Gen 3 RCD is a major milestone for the memory industry to help meet the bandwidth and scaling capacity needs of our datacenter customers. The client clock driver is a new industry initiative to further enhance the client DIMM. Renesas and Intel have been collaborating with the industry to help ensure specification and implementations of the Gen 3 RCD and client clock driver to meet the market needs,” said Dr. Dimitrios Ziakas, Vice President of Memory and IO Technologies at Intel.

The RCD driver buffers the command address (CA) bus, chip selects and clock between the host controller and DRAM modules, in addition to creating a BCOM bus to control LRDIMM data buffering. The new driver enhances decision-feedback equalizer (DFE) support by increasing the DFE taps from four to six to improve receiver margin, while I2C and I3C sideband bus support provides direct contact to the register access control.

The CKD buffers the clock between the host controller and DRAM, which is a new requirement for DDR5 DIMMs operating at speeds of up to 7200 MT/s for client DIMMs and memory down applications. The new clock driver supports I2C and I3C sideband access to enable asynchronous control and provides access to internal control words for configuring device features and adapting to different SODIMM and UDIMM configurations and memory down system applications.

RCD and CKD Driver Winning Combinations
Renesas has combined the RCD and CKD drivers with other compatible devices from its Winning Combinations portfolio, including DDR5 power management integrated circuits (PMICs) and serial presence detect (SPD) hubs for the CKD. The RCD can also be paired with Renesas’ temperature sensors, SPD Hub, PMICs, and data buffers. Winning Combinations are technically vetted system architectures from mutually compatible devices that work together seamlessly to bring an optimized, low-risk design for faster time to market. Renesas offers more than 400 Winning Combinations with a wide range of products from the Renesas portfolio to enable customers to speed up the design process and bring their products to market more quickly.

Availability
The RG5C172B0C0GBX#BC0 and RG5C172B0C0GBX#HC0 client clock drivers are sampling now in a 2.3mm x 5.8mm 35-FCBGA package and will be available in volume in the second half of 2023. The RG5R364A0C0GBY#BC0 and RG5R364A0C0GBY#HC0 DDR5 third-generation registered clock drivers are sampling now in an 8.7mm x 13.5mm FCCSP package and will be available in volume in the first half of 2024.

More information on the new driver ICs is available at www.renesas.com/DDR5.

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