The KSZ8081RNB / KSZ8091RNB is a 10Base-T/100Base-TX Physical Layer Transceiver with an RMII MAC interface. It utilizes a unique mixed-signal design to extend signaling distance while reducing power consumption, and offers HP Auto MDI/MDI-X for reliable detection of and correction for crossover and straight-through cables, eliminating the need to differentiate between crossover and straight-through cables. The KSZ8091RNB supports Energy Efficient Ethernet (EEE) and Wake-On-LAN (WOL), while the KSZ8081RNB does not. The KSZ8081RNB / KSZ8091RNB comes in a 32-pin, lead-free QFN package and provides an ideal solution for 10Base-T/100Base-TX applications that have tight PCB board space. The KSZ8081RNB and KSZ8091RNB Eval Boards (KSZ8081RNB-EVAL and KSZ8091RNBEVAL) provide a convenient platform to evaluate the features of the device. All configuration pins are accessible either by jumpers, test points or interface connectors.


    • KSZ8081RNB or KSZ8091RNB 10Base-T/100Base-TX Physical Layer Transceiver • RJ-45 Jack for Fast Ethernet cable interface • HP Auto MDI/MDI-X for automatic detection and correction for straight-through and crossover cables • RMII (Reduced Media Independent Interface) using an MII connector to interface with a MAC controller • 2 LED Indicators for status and activity • Jumpers to configure strapping pins • Manual Reset Button for quick reboot after re-configuration of strapping pins


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