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Fast Ethernet 10/100 Quad Transceivers

The LXT974 and LXT975 are four-port PHY Fast Ethernet Transceivers which support IEEE 802.3 physical layer applications at both 10 Mbps and 100 Mbps. They provide all of the active circuitry to interface four 802.3 Media Independent Interface (MII) compliant controllers to 10BASE-T and/or 100BASE-TX media.

Product Features

■ Four independent IEEE 802.3-compliant 10BASE-T or 100BASETX ports in a single chip.

■ 100BASE-FX fiber-optic capable.

■ Standard CSMA/CD or full-duplex operation.

■ Supports auto-negotiation and legacy systems without auto-negotiation capability.

■ Baseline wander correction.

■ 100BASE-TX line performance over 130 meters.

■ Configurable LED drivers and serial LED output.

■ Configurable through MII serial port or via external control pins.

■ Available in 160-pin PQFP with heat spreader.

■ Commercial temperature range (0-70oC ambient).

■ Part numbers:

—LXT974AHC

—LXT974BHC

—LXT975AHC

—LXT975BHC

Applications

■ 10BASE-T, 10/100-TX, or 100BASE-FX Switches and multi-port NICs.

■ LXT975 optimized for dual-high stacked modular RJ-45 applications.