Intel LXT974/LXT975 Fast Ethernet 10/100 Mbps Quad Transceivers Datasheet The Intel LXT974 and LXT975 Fast Ethernet 10/100 Mbps Quad Transceivers (called hereafter the LXT974/975 Transceiver) 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. This data sheet applies to all versions of the LXT974 and LXT975 products including LXT974A, LXT974B, LXT975A, and LXT975B. As a result of product changes, Revision 4 parts are labeled LXT974B and LXT975B. Revision 3 parts are labeled LXT974A and LXT975A. The differences in these product revisions are described in the LXT974/975 Specification Update. All four ports on the LXT974 provide a combination twisted-pair (TP) or pseudo-ECL (PECL) interface for a 10/100BASE-TX or 100BASE-FX connection. The LXT975 is pin compatible with the LXT974 except for the network ports. The LXT975 is optimized for dual-high stacked RJ-45 modular applications and provides a twisted-pair interface on every port, but the PECL interface on only two. The LXT974/975 provides three separate LED drivers for each of the four PHY ports and a serial LED interface. In addition to standard Ethernet, each chip supports full- duplex operation at 10 Mbps and 100 Mbps. The LXT974/975 requires only a single 5V power supply. The MII may be operated independently with either a 3.3V or 5V supply. Applications 10BASE-T, 10/100-TX, or 100BASE- LXT975 optimized for dual-high stacked FX Switches and multi-port NICs. modular RJ-45 applications. Product Features Four independent IEEE 802.3- Configurable LED drivers and serial LED output. compliant 10BASE-T or 100BASE- Configurable through MII serial port or via TX ports in a single chip. external control pins. 100BASE-FX fiber-optic capable. Available in 160-pin PQFP with heat spreader. o Standard CSMA/CD or full-duplex Commercial temperature range (0-70 C operation. ambient). Supports auto-negotiation and legacy Part numbers: systems without auto-negotiation Intel HBLXT974BHC Transceiver capability. Intel WBLXT974BHC Transceiver (RoHS Baseline wander correction. Compiant) 100BASE-TX line performance over Intel HBLXT975BHC Transceiver 130 meters. Intel WBLXT975BHC Transceiver (RoHS Compliant) Order Number: 249274-002 17-Jan-2005Legal Lines and Disclaimers INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL PRODUCTS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER, AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY, RELATING TO SALE AND/OR USE OF INTEL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. Intel products are not intended for use in medical, life saving, life sustaining, critical control or safety systems, or in nuclear facility applications. Intel may make changes to specifications and product descriptions at any time, without notice. Intel Corporation may have patents or pending patent applications, trademarks, copyrights, or other intellectual property rights that relate to the presented subject matter. The furnishing of documents and other materials and information does not provide any license, express or implied, by estoppel or otherwise, to any such patents, trademarks, copyrights, or other intellectual property rights. The Intel LXT974/LXT975 Fast Ethernet 10/100 Mbps Quad Transceivers may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current characterized errata are available on request. Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order. Copies of documents which have an order number and are referenced in this document, or other Intel literature may be obtained by calling 1-800-548-4725 or by visiting Intel s website at