LTX9883 Datasheet | Level One Communications

.. Data Sheet - Preliminary Information MAY 2000 Revision 1.0 LXT9883/LXT9863 Advanced 10/100 Unmanaged Repeater General Description The LXT9883 is an advanced, 3.3V, 8-port 10/100 repeater. The LXT9883 is patible with previous generations of Level One repeaters from the LXT980 and LXT918 families. Eight ports directly support 100BASETX/10BASE-T copper media. Two additional Media Independent Interface (MII) ports (10/100 Mbps selectable) connect to Media Access Controllers (MACs) for bridge/switch applications. The LXT9863 offers the same Features and functionality in a six-port device. This data sheet uses the singular designation “LXT98x3” to refer to both devices. The LXT98x3 provides auto-negotiation with parallel detection for the PHY ports. The LXT98x3 provides two internal repeater state machines- one operating at 10 Mbps and one at 100 Mbps. Once configured, the LXT98x3 automatically connects each port to the appropriate repeater. The LXT98x3 also provides two Inter-Repeater Backplanes (IRBs) for expansion - one operating at 10 Mbps and one at 100 Mbps. Up to 240 twisted-pair and MII ports can logically be bined into one repeater. Features - Six or eight 10/100 ports with integrated twisted-pair PHYs including integrated filters. - Two 10/100 MIIs for bridging. - Independent operation. segments for 10 and 100 Mbps - Cascadable Inter-Repeater Backplanes (IRBs), with option for 5V stacking patibility. - Integrated LED drivers with user-selectable modes. - Available in 208-pin QFP package. - Operating temperature range: 0-70°C, ambient. LXT98x3 Block Diagram 10M IRB 10 Mbps Backplane 10BASE-T Repeater 10/100 PHY 1 10/100 PHY 2 10/100 PHY 3 Port Switching Logic 10/100 PHY 4 10/100 PHY 5 10/100 PHY 6 10/100 PHY 7 10/100 PHY 8 TX_I/O TX_I/O TX_I/O TX_I/O TX_I/O TX_I/O TX_I/O TX_I/O 100M IRB 100 Mbps Backplane 100BASE-X Repeater Port & Mgmt Status Indicators Serial LED Drivers MII 1 MII 2 MII_I/O MII_I/O Refer to...