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MC10SX1189: Fibre Channel Coaxial Cable Driver and Loop Resiliency Circuit

The MC10SX1189 is a differential receiver, differential transmitterspecifically designed to drive coaxial cables. It incorporates the outputcable drive capability of the MC10EL89 Coaxial Cable Driver withadditional circuitry to multiplex the output cable drive source between thecable receiver or the local transmitter inputs. The multiplexer controlcircuitry is TTL compatible for ease of operation. The MC10SX1189 is useful as a bypass element for Fibre Channel-Arbitrated Loop (FC-AL) or Serial Storage Architecture (SSA) applications, to create loop style interconnects with fault tolerant, active switches at each device node. This device is particularly useful for back panel applications where small size is desirable. The EL89 style drive circuitry produces swings twice as large as a standard PECL output. When driving a coaxial cable, proper termination is required at both ends of the line to minimize reflections. The 1.6V output swings allow for proper termination at both ends of the cable, while maintaining the required swing at the receiving end of the cable. Because of the larger output swings, the QT, QTbar outputs are terminated into the thevenin equivalent of 50? to VCC 3.0V instead of 50? to VCC 2.0V.

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