In summary, Renesas is addressing this need for lower power systems by designing low-power HCSL output devices. Using a push-pull output type, the low-power HCSL outputs can save up to 85% at 3.3V, and with a VDDIO of 1.05V, the savings can be even greater. There are three different clocks that are needed for the Romley/Grantley platform; the main clock, PCIe buffer, and the peripheral clock. Renesas has solutions for each type of clock that follows the Intel Yellow Cover specification. The Renesas 932SQ420D device meets the Yellow Cover CK420BQ main clock specification for Romley/Grantley and has been enhanced to support PCIe Gen 2, PCIe Gen 3, Intel QPI, and SAS clock phase jitter performance specifications. The 9ZX21901 is a 19-output Z-buffer based on the Intel DB1900Z Z-buffer specification available in two versions: the tunable external feedback Rev B and fixed external feedback Rev C. Renesas also has 15-output and 12-output versions available. All Z-buffers share DB1900Z features such as multiple SMBus addresses and work into 100 Ω or 85 Ω differential impedances. There are significant power savings when using the LP-HCSL versions of the Romley/Grantley Yellow Cover devices which Renesas is developing for the server timing market.