KS8721SL

www.DataSheet4U.com www.micrel.com KS8721BL/SL Product Brief 3.3V 10/100BASE-TX/FX Physical Layer Transceiver Description The KS8721BL/SL is a 10BASE-T, 100BASE-TX, and 100BASE-FX physical layer transceiver providing MII/ RMII interfaces to MACs and switches. Using a unique mixed-signal design that extends signaling distance while reducing power consumption, the KS8721BL/SL represents Micrel’s fourth generation single-port Fast Ethernet PHY. Micrel’s architecture dissipates an ultra-low 275mW in power, including transmit output drivers. This translates to increased reliability while enabling deployment in today’s power-sensitive applications. Multiple power-down modes, accessed via configuration pins or registers, allow further levels of power saving through manual selection or automatic detection of cable energy. The KS8721BL/SL automatically configures itself for 100Mbps or 10Mbps and full- or half-duplex operation, using an on-chip auto-negotiation algorithm. Combined with Auto MDI/MDIX for automatic correction and detection of crossover and straight-through cables, the KS8721BL/SL provides an easy-to-use, high performance solution for 10BASE-T, 100BASE-TX, and 100BASE-FX applications. For additional information, contact your local Micrel Field Application Engineer or salesperson. Block Diagram NRZ/NRZI MLT3 Encoder 4B/5B Encoder Scrambler Parallel/Serial TXD3 TXD2 TXD1 TXD0 TXER TXC TXEN CRS COL MDIO MDC RXD3 RXD2 RXD1 RXD0 RXER RXDV RXC TX+ TX– Transmitter 10/100 ...