TM Cortina Systems LXT973 10/100 Mbps Dual-Port Fast Ethernet PHY Transceiver Datasheet The Cortina Systems LXT973 10/100 Mbps Dual-Port Fast Ethernet PHY Transceiver (LXT973 Transceiver) is an IEEE 802.3 compliant, dual-port, Fast Ethernet PHY transceiver that directly supports both 100BASE-TX and 10BASE-T applications. Each port provides a Media Independent Interface (MII) for easy attachment to 10 Mbps and 100 Mbps Media Access Controllers (MACs). The LXT973 Transceiver also provides a Low-Voltage Positive Emitter Coupled Logic (LVPECL) interface per port for use with 100BASE-FX fiber networks. The LXT973 Transceiver incorporates the auto MDI/MDIX feature, allowing it to automatically switch twisted-pair inputs and outputs. The LXT973 Transceiver is an ideal building block for systems that require two Ethernet ports, such as Internet Protocol (IP) Telephones, Twisted-Pair (TX)-to-Fiber (FX) converter modules, and for telecom applications, such as Telecom Central Office (TCO) and Customer Premise Equipment (CPE) devices. The LXT973 Transceiver supports full-duplex operation at both 10 Mbps and 100 Mbps. Its operating modes can be set using auto-negotiation, parallel detection, or manual control. Applications Enterprise switches Storage Area Networks IP telephony switches Multi-port Network Interface Cards (NICs) Product Features Dual-port Fast Ethernet PHY 20 MHz Register Access 2.5 Voperation Configurable via MDIO port or external control pins 3.3 Voperation I/O compatibility Integrated termination resistors Low power consumption 250 mW per port typical 100-pin Plastic Quad Flat Package (PQFP) Full dual-port MII interface with extended Commercial (0 C to 70 C ambient) registers SLXT973QC Transceiver Auto MDI/MDIX switch over capability EGLXT973QC Transceiver (RoHS Compliant) Signal Quality Error (SQE) enable/disable (-40 C to +85 C ambient) (Extended) 100BASE-FX fiber-optic capability on both ports SLXT973QE Transceiver Supports both auto-negotiation systems and EGLXT973QE Transceiver (RoHS Compliant legacy systems without auto-negotiation capability Support for Next Page 249426, Revision 7.0LXT973 Transceiver Legal Disclaimers Datasheet 249426, Revision 7.0 23 August 2011 INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH CORTINA SYSTEMS PRODUCTS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN CORTINAS TERMS AND CONDITIONS OF SALE OF SUCH PRODUCTS, CORTINA ASSUMES NO LIABILITY WHATSOEVER, AND CORTINA DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE AND/OR USE OF CORTINA PRODUCTS, INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. Cortina products are not intended for use in medical, life saving, life sustaining, critical control or safety systems, or in nuclear facility applications. CORTINA SYSTEMS , CORTINA, and the Cortina Earth Logo are trademarks or registered trademarks of Cortina Systems, Inc. or its subsidiaries in the US and other countries. Any other product and company names are the trademarks of their respective owners. Copyright 20012011 Cortina Systems, Inc. All rights reserved. Cortina Systems LXT973 10/100 Mbps Dual-Port Fast Ethernet PHY Transceiver Page 2