The SMSC LAN83C183 is a highly integrated analog interface IC for twisted pair Ethernet applications. The LAN83C183 can be configured for either 100-Mbps (100BASE-TX or 100 BASE-FX) or 10-Mbps (10BASE-T) Ethernet operation. The 100BASE-FX is packaged in a 64-Pin TQFP pack-age. The LAN83C183 consists of a 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 LAN83C183 can automatically configure itself for 100- or 10-Mbps and full- or half-duplex operation with the on-chip AutoNegotiation algorithm. The eleven 16-bit registers of the LAN83C183 can be accessed through the Management Interface (MI) serial port. These registers contain configuration inputs, status outputs, and device capabilities. The LAN83C183 is ideal as a media interface for 100BASE-TX/10BASE-T adapter cards, PC Cards, motherboards, mobile applications, repeaters, switching hubs, and external PHYs. The LAN83C183 operates from a single 3.3V supply. All inputs and outputs are 5V-tolerant and can directly interface to other 5V devices.