4:1 differential mux at 3 GHz
The Renesas 853S057AGILFT is a 4:1 differential clock multiplexer that routes one of four input clock sources to a single output. It handles CML, LVDS, LVPECL, and SSTL input levels and outputs ECL or LVPECL — covering the common high-speed serial clock families found on FPGA reference clocks, SERDES PLLs, and backplane timing cards. The 3 GHz maximum frequency means this part sits comfortably in 10G+ line-card timing trees where the reference clock runs at 156.25 MHz or 312.5 MHz and the mux must pass the edge without adding jitter. The differential input-to-output path (Yes/Yes) preserves the signal integrity through the switch matrix.
The surface-mount assembly matches standard reflow profiles; no special handling beyond MSL level typical for TSSOP.