PLL clock source for PCIe and Ethernet timing
The Renesas 557GI-03LF is a single-channel PLL clock source designed to generate a clean, jitter-compliant reference for PCI Express and Ethernet interfaces. It accepts a clock or crystal input and outputs one HCSL or LVDS pair — a 1:2 fanout — at frequencies up to 200 MHz. The differential output eliminates common-mode noise coupling into the PCIe reference clock tree, which is critical for keeping bit-error rates within the PHY's budget. Housed in a 16-TSSOP package, it operates from a 2.97 V to 3.63 V supply over the industrial temperature range of -40°C to 85°C, making it a fit for outdoor telecom cabinets, factory-floor switches, and motor-drive backplanes where the ambient temperature swings.
The 557GI-03LF carries an Active status and ROHS3 compliance. If you are dual-sourcing for supply resilience, the closest functional match in the same package footprint is the 9ZXL0851EKKLF — it offers a 1:8 fanout and 400 MHz ceiling, but the pinout and control logic differ; a board spin would be required.