Am79C875

The NetPHY™ 4LP device is a highly integrated, low power 10BASE-T/100BASE-TX/FX Quad Ethernet transceiver. The NetPHY™ 4LP device includes integrated RMII, ENDECs, Scrambler/Descrambler, and full-featured Auto-Negotiation with support for Parallel Detection and Next Page. Port 3 can be configured as a 100BASE-FX transmitter to output an NRZI PECL level signal. Each receiver has an adaptive equalizer/DC restoration circuit for accurate clock/data recovery on the 100BASE-TX signal at different cable lengths and can perform to 125 m and beyond.

The NetPHY™ 4LP device operates on a 3.3 V supply and offers 5 V I/O tolerance for mixed signal designs. Power consumption is 1.3 W typical for the device, or 0.3 W per port using 1:1 magnetics. The NetPHY™ 4LP device can use 1.25:1 magnetics, which decreases transmit power consumption and reduces device power consumption to 1.2 W typical.

The NetPHY™ 4LP device offers an optimized pinout for network applications. RMII pins can be routed directly to the MAC and TX/RX media pins are routed directly to the magnetics. Direct routing of high speed traces is imperative for project system design and EMI noise reduction.

The NetPHY™ 4LP device's on-chip input filtering and output waveshaping eliminates the need of external hybrid
filters for media connection. Integrated LED logic allows three LEDs per port to be driven directly. These features greatly simplify the design of a 100BASE-X repeater/ switch board, thus requiring minimum external components.

For ease of system and chip setup and testing, the Net- PHY™ 4LP device offers loopback and various advanced testing and monitoring capabilities.

The NetPHY™ 4LP device is available in the Commercial (0 to 70 ) or Industrial (-40 to +85 ) temperature
ranges. The Industrial temperature range is well suited to environment such as enclosures with restricted air flow or outdoor equipment.