Ksz80 Ob S4lv02 Datasheet [top] -

Manufactured by Microchip Technology (acquired from Micrel), this chip is favored for its low power consumption, small footprint, and integrated termination resistors, which reduce the overall Bill of Materials (BOM) cost.

The does not exist as a single unified document. The correct approach is to recognize that "KSZ80" indicates a Microchip KSZ8081/KSZ8041 Ethernet PHY , while "OB S4LV02" is an OEM-specific tracking mark. ksz80 ob s4lv02 datasheet