Product Summary

The LXT983QC is a 5-port 10/100 Class II Repeater that is fully compliant with IEEE 802.3 standards. Four ports directly support 100BASE-TX/10BASE-T copper media and also support 100BASE-FX fiber media via pseudo-ECL (PECL) interfaces. The fifth port, a 10- or 100-Mbps Media Independent Interface (MII), connects to Media Access Controllers (MACs) for bridge/switch applications. At 100 Mbps, the MII can also be configured to interface to another PHY device, such as the LXT970. This data sheet applies to all LXT983QC products, except as specifically noted. The LXT983QC provides auto-negotiation with parallel detection for the four PHY ports. These ports can also be configured by the user. The LXT983QC provides two internal repeater state machines—one operating at 10 Mbps and one at 100 Mbps. Once configured, the LXT983QC automatically connects each port to the appropriate repeater. The LXT983QC provides two Inter-Repeater Backplanes (IRBs) for expansion—one operating at 10 Mbps and one at 100 Mbps. Up to 240 ports can be logically combined into one repeater.

Parametrics

LXT983QC absolute maximum ratings: (1)Supply voltage VCC: -0.3 to 6 V; (2)Operating temperature, Ambient TOPA: -15 to +80 ℃; (3)Case TOPC: +130 ℃; (4)Storage temperature TST: -65 to +150 ℃.

Features

LXT983QC features: (1)Four 10/100 ports include; (2)Complete twisted-pair PHYs with integrated filters; (3)100BASE-FX PECL interfaces; (4)10/100 MII port connection to either MAC or PHY; (5)Independent segments for 10 and 100 Mbps operation; (6)Cascadable IRBs; (7)Integrated per-port LED drivers with userselectable modes; (8)Integrated per-segment LED drivers for collisions and activity; (9)Available in 208-pin QFP package.

Diagrams

LXT983QC block diagram

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