KS8721B/BT Micrel, Inc. KS8721B/BT 2.5V 10/100BasTX/FX MII Physical Layer Transceiver Rev. 2.3 General Description Features Operating at 2.5 volts to meet low voltage and low power Single chip 100BaseTX/100BaseFX/10BaseT physical requirements, the KS8721B/BT is a 10BaseT/100BaseTX/ layer solution FX Physical Layer Transceiver, which provides an MII to 2.5V CMOS design, power consumption <200mW transmit and receive data. It contains the 10BaseT Physical (excluding output driver current ) Medium Attachment (PMA), Physical Medium Dependent Fully compliant to IEEE 802.3u standard (PMD), and Physical Coding Sub-layer (PCS) functions. Supports Media Independent Interface (MII) and Moreover, the KS8721B/BT has on-chip 10BaseT output Reduced MII (RMII) filtering, which eliminates the need for external filters and Supports 10BaseT, 100BaseTX and 100BaseFX with allows a single set of line magnetics to be used to meet Far End Fault Detection requirements for both 100BaseTX and 10BaseT. Supports power down mode and power saving mode Configurable through MII serial management ports or via The KS8721B/BT can automatically configure itself for 100 or external control pins 10 Mbps and full or half duplex operation, using on-chip Auto- Supports auto-negotiation and manual selection for Negotiation algorithm. It is an ideal choice of physical layer 10/100Mbps speed and full/half-duplex mode transceiver for 100BaseTX/10BaseT applications. On-chip built-in analog front end filtering for both Data sheets and support documentation can be found on 100BaseTX and 10BaseT Micrels web site at www.micrel.com. Functional Diagram 4B/5B Encoder NRZ/NRZI Scrambler TXD3 10/100 MLT3 Encoder TX+ Parallel/Serial TXD2 Transmitter Pulse TXD1 TX- Shaper TXD0 Parallel/Serial TXER Manchester Encoder TXC TXEN MII/RMII Adaptive EQ CRS Registers COL RX+ Base Line 4B/5B Decoder and Clock MDIO Wander Correction Descrambler Controller Recovery MDC RX- MLT3 Decoder Serial/Parallel Interface RXD3 NRZI/NRZ RXD2 RXD1 Auto RXD0 Negotiation RXER RXDV 10BaseT Manchester Decoder RXC Receiver Serial/Parallel Power LINK Down or Saving COL LED XI Driver FDX PLL XO SPD PWRDWN Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 KS8721B/BT Micrel, Inc. Features (continued) Ordering Information LED outputs for link, activity, full/half duplex, collision Part Number Temperature Range Package and speed KS8721B 0C to +70C 48-Pin SSOP Supports back to back, FX to TX for media converter KS8721BI 40C to +85C 48-Pin SSOP applications Supports MDI/MDI-X auto crossover KSZ8721B 0C to +70C 48-Pin SSOP Lead Free 2.5V/3.3V tolerance on I/O KS8721BT 0C to +70C 48-Pin TQFP Commercial temperature range: 0C to +70C KSZ8721BT 0C to +70C 48-Pin TQFP Lead Free Industrial temperature range: 40C to +85C Available in 48-pin SSOP and TQFP M9999-041405 2 April 2005