High-Performance MII and RMII 10/100 Ethernet PHY with HP Auto-MDIX and Small Footprint

2006-04-27

The SMSC LAN8700/LAN8700I is a low-power, industrial temperature (LAN8700I), variable I/O voltage, analogue interface IC with HP Auto-MDIX for high-performance embedded Ethernet applications. The LAN8700/LAN8700I can be configured to operate on a single 3.3V supply using an integrated 3.3V to 1.8V linear regulator. An option is available to disable the linear regulator to optimize system designs that have a 1.8V system supply available.

The LAN8700/LAN8700I consists of an encoder/decoder, scrambler/descrambler, wave-shaping transmitter, output driver, twisted-pair receiver with adaptive equaliser and baseline wander (BLW) correction, and clock and data recovery functions. The LAN8700/LAN8700I can be configured to support either the Media Independent Interface (MII) or the Reduced Media Independent Interface (RMII).

The LAN8700/LAN8700I is compliant with IEEE 802.3-2005 standards (MII Pins tolerant to 3.6V) and supports both IEEE 802.3-2005 compliant and vendor-specific register functions. It contains a full-duplex 10-BASE-T/100BASE-TX transceiver and supports 10Mbps (10BASE-T) operation on Category 3 and Category 5 unshielded twisted-pair cable, and 100Mbps (100BASE-TX) operation on Category 5 unshielded twisted-pair cable.

The part is packaged in a small footprint, low profile, 36 pin QFN package (6 x 6 x 0.9mm) that is fully RoHS compliant. An evaluation board is available that interfaces a MAC controller to the SMSC LAN8700 Ethernet PHY through an MII connector, and out to an RJ-45 Ethernet jack through industrial temperature rated magnetics for 10/100 connectivity.