PCIe reference clock with integrated PLL
The DSC557-0344FI0T is a PCI Express (PCIe) clock generator from Microchip Technology's DSC557-03 series, delivering a 100 MHz HCSL differential output from a single-ended input — the standard topology for PCIe Gen1, Gen2, and Gen3 reference clocks. The integrated PLL synthesises the output without an external VCXO or crystal, reducing BOM count on the clock tree. The 0:2 input-to-output ratio means it accepts one reference and drives two HCSL lanes — enough for a root complex and one endpoint on the same clock domain.