1:4 differential fanout buffer for PCIe and QPI clock distribution
The 9DBL411BKLFT is a 1:4 differential fanout buffer from Renesas, designed to distribute a single HCSL input to four LP-HCSL outputs. It targets Intel QPI and PCI Express (PCIe) clock trees where low additive jitter and matched skew across the four lanes are required. The 150 MHz maximum frequency and 1:4 fanout ratio mean this part fits a PCIe Gen1/Gen2 reference-clock distribution scheme where one source fans out to four endpoints — a PCH, a CPU, and two downstream devices, for example.
Package and board integration
The 0.50 mm pitch QFN pads demand a solder-paste stencil aperture sized per the land pattern in the Renesas application note for this package family. Commercial temperature grade (0°C to 70°C) limits the part to indoor equipment — no cold-start at -40°C.