The L80225 is a highly integrated analog interface IC for twisted pair Ethernet applications. The L80225 can be configured for either (100Base-TX) or 10 Mbps (10Base-T) Ethernet operation.
The L80225 consists of 4B5B/Manchester encoder/decoder, scrambler/descrambler, transmitter with wave shaping and output driver, twisted pair receiver with on chip equalizer and baseline wander correction, clock and data recovery, AutoNegotiation, controller interface (MII), and serial port (MI).
The addition of internal output waveshaping circuitry and on-chip filters eliminates the need for external filters normally required in 100Base-TX and 10Base-T applications. The L80225 can automatically configure itself for 100 or 10 Mbps and Full or Half Duplex operation with the on-chip AutoNegotiation algorithim. The L80225 can access six 16-bit registers through the Management Interface (MI) serial port. These registers contain configuration inputs, status outputs, and device capabilities.
The L80225 is ideal as a media interface for 100Base-TX/ 10Base-T adapter cards, motherboards, repeaters, switching hubs, and external PHYs. The L80225 operates from a single 3.3V supply. All inputs and outputs are 5V tolerant and will directly interface to other 5V devices.
PLCC 44 package. Manufactured by LSI.