400 MHz PLL with 1:8 HCSL fanout for PCIe and QPI
The 9ZXL0851EKILF is a PLL-based clock generator from Renesas' DB800ZL "LITE" family, designed to generate a clean 100 MHz or higher reference clock for Intel QPI and PCI Express interfaces. It takes one differential clock input and fans it out to eight HCSL outputs, each capable of running up to 400 MHz. The 1:8 ratio means a single device replaces multiple smaller fanout buffers, saving board space and reducing the number of PLLs that need to lock to the same reference. The differential input and output architecture keeps the signal path balanced, which is essential for maintaining low jitter on high-speed serial links.
Supply and temperature — industrial-grade operation
The 48-VFQFPN (6x6 mm) package has an exposed pad underneath. A layout without proper thermal vias will see the PLL lose lock at high temperature.
Active lifecycle — no end-of-life risk
Renesas lists the 9ZXL0851EKILF as Active.