LXT972

Data Sheet FEBRUARY 2000 LXT972 3.3V Dual-Speed Fast Ethernet Transceiver General Description The LXT972 is an IEEE compliant Fast Ethernet PHY Transceiver that directly supports both 100BASE-TX and 10BASE-T applications. It provides a Media Independent Interface (MII) for easy attachment to 10/100 Media Access Controllers (MACs). The LXT972 supports full-duplex operation at 10 Mbps and 100 Mbps. Its operating condition can be set using auto-negotiation, parallel detection, or manual control. The LXT972 is fabricated with an advanced CMOS process and requires only a single 3.3V power supply. Revision 1.1 Features 3.3V Operation. Low power consumption (300 mW typical). 10BASE-T and 100BASE-TX using a single RJ-45 connection. Supports auto-negotiation and parallel detection. MII interface with extended register capability. Robust baseline wander correction performance. Standard CSMA/CD or full-duplex operation. Configurable via MDIO serial port or hardware control pins. Integrated, programmable LED drivers. 64-pin Low-profile Quad Flat Package (LQFP). LXT972LC - Commercial (0° to 70°C ambient). Applications Combination 10BASE-T/100BASE-TX Network Interface Cards (NICs) 10/100 PCMCIA Cards Cable Modems and Set-Top Boxes LXT972 Block Diagram RESET ADDR0 MDIO MDC MDINT MDDIS TX_EN TX PCS T X D <3:0> TX_ER TX_CLK Parallel/Serial Converter Management / Mode Select Logic Pwr Supply Register Set Clock Generator VCC GND PWRDWN REFCLK TxSLEW<1:0> Manch...