2 GHz fanout buffer for high-speed clock trees
The LMK1D1208RHDT is a 2:8 differential clock buffer from Texas Instruments, accepting HCSL, LVCMOS, LVDS, or LVPECL inputs and delivering eight LVDS outputs at up to 2 GHz. It operates from any of three supply rails — 1.8V, 2.5V, or 3.3V nominal — so it can drop into existing power domains without a dedicated regulator.
The 2 GHz max frequency covers reference clocks for PCIe Gen5 and other high-speed interfaces. The 2:8 ratio means two independent input clocks each fan out to four outputs, or one input fans to all eight if the second input is unused. All input-output paths are fully differential, so the part preserves signal integrity on long PCB traces without extra conditioning. The three supply ranges cover 1.8V, 2.5V, and 3.3V logic families — confirm which rail your system already carries before adding a regulator.
Package and thermal: the exposed pad is not optional
If the board layout omits thermal vias under that pad, the junction temperature rises faster than the datasheet derating curve assumes — especially at 105°C ambient.