The LXT908 Universal 10BASE-T and AUI Transceiver is designed for IEEE 802.3 physical layer applications. It provides all the active circuitry to interface most standard 802.3 controllers to either the 10BASE-T media or Attachment Unit Interface (AUI). In addition to standard 10 Mbps Ethernet, the LXT908 also supports full-duplex operation at 20 Mbps.
LXT908 functions include Manchester encoding/decoding, receiver squelch and transmit pulse shaping, jabber, link testing and reversed polarity detection/correction. The LXT908 can be used to drive either the AUI drop cable or the 10BASE-T twisted-pair cable with only a simple isolation transformer. Integrated filters simplify the design work required for FCC-compliant EMI performance.
The LXT908 is fabricated with an advanced CMOS process and requires only a single 3.3V power supply.

Product Features
Functional Features
■ Improved Filters - Simplifies FCC Compliance
■ Integrated Manchester Encoder/Decoder
■ 10BASE-T compliant Transceiver
■ AUI Transceiver
■ Supports Standard and Full-Duplex Ethernet

Diagnostic Features
■ Four LED Drivers
■ AUI/RJ-45 Loopback

Convenience Features
■ Automatic/Manual AUI/RJ-45 Selection
■ Automatic Polarity Correction
■ SQE Disable/Enable function
■ Power Down Mode with tri-stated outputs
■ Four loopback modes
■ Single 3.3V operation
■ Available in 64-pin LQFP and 44-pin PLCC package
■ Commercial (0 to +70°C) and Extended (-40 to +85°C) temperature range

APPLICATIONs
■ Access devices (DSL, Cable Modems, and Set-top Boxes)
■ Routers/Bridges/Switches/Hubs
■ Telecom Backplane
■ USB to Ethernet Converters