General Description
The VSC7146 is a 2.5Gb/s Transceiver optimized for ease-of-use and efficiency in high-performance data transmission systems. The VSC7146 accepts two 10-bit 8b/10b encoded transmit characters, latches them on the rising edge of Transmit Byte Clock (TBC) and serializes the data onto the TX+/- differential outputs at a baud rate, which is 20 times the TBC frequency. The VSC7146 also samples serial receive data on the RX+/- differential inputs, recovers the clock and data, deserializes it onto two 10-bit receive characters, outputs a recovered clocks at one-twentieth of the incoming baud rate and detects Fibre Channel “comma” characters. The VSC7146 contains on-chip Phase-Lock Loop (PLL) circuitry for synthesis of the baud-rate transmit clock, and extraction of the clock from the received serial stream. These circuits are fully monolithic and require no external components.
   
Features
• Speed Selectable Full-Duplex Transceiver:
    - 1.06/2.12Gb/s for FibreChannel
    - 1.25/2.5Gb/s for Gigabit Ethernet
• 20-Bit TTL Interface for Transmit and
    Receive Data at 125MHz
• Monolithic Clock Synthesis and Clock
    Recovery - No External Components
• 125MHz TTL Reference Clock
• Automatic Lock-to-Reference Function
• Suitable for Both Coaxial and Optical Link Applications
• Low Power Operation: 2.5 W max
• 80-Pin, 14mm Thermally-Enhanced EDQUAD
    Package
• Single +3.3V Supply