TM
Cortina Systems® LXT908 Universal 3.3 V
10BASE-T and AUI Transceiver
Datasheet
The Cortina Systems® LXT908 Universal 3.3 V 10BASE-T and AUI Transceiver (LXT908 PHY) 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 PHY also supports full-duplex operation at 20 Mbps.
LXT908 PHY functions include Manchester encoding/decoding, receiver squelch and transmit pulse
shaping, jabber, link testing and reversed polarity detection/correction. The LXT908 PHY 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 PHY is fabricated with an advanced CMOS process and requires only a single 3.3 V power
supply.
Applications
Access devices (DSL, Cable Modems, and
Set-top Boxes)
Routers/Bridges/Switches/Hubs
Telecom Backplane
USB to Ethernet Converters
Features
Functional Features
Diagnostic Features
Convenience Features
Improved Filters - Simplifies FCC Compliance
Integrated Manchester Encoder/Decoder
10BASE-T compliant Transceiver
AUI Transceiver
Supports Standard and Full-Duplex Ethernet
Four LED Drivers
AUI/RJ-45 Loopback
Automatic/Manual AUI/RJ-45 Selection
Automatic Polarity Correction
SQE Disable/Enable function
Power Down Mode with tristated outputs
Four loopback modes
Single 3.3 V operation
Available in 64-pin LQFP and 44-pin PLCC
package
Commercial (0 to +70°C) and
Extended (-40 to +85°C) temperature range
249049, Revision 4.0
