KS8721CL Micrel, Inc. KS8721CL 3.3V Single Power Supply 10/100BASE-TX/FX MII Physical Layer Transceiver Rev. 1.2 General Description Features Single chip 100BASE-TX/100BASE-FX/10BASE-T The KS8721CL is a 10BASE-T, 100BASE-TX, and 100BASE- physical layer solution FX physical layer transceiver providing MII/RMII interfaces to 2.5V CMOS design 2.5/3.3V tolerance on I/O MACs and switches. Using a unique mixed-signal design that 3.3V single power supply with built-in voltage regulator extends signaling distance while reducing power consump- Power consumption <340mW (including output driver tion, the KS8721CL represents Micrels fourth generation current) single-port Fast Ethernet PHY. Fully compliant to IEEE 802.3u standard The KS8721CL contains 10BASE-T physical medium attach- Supports MII and Reduced MII (RMII) ment (PMA), physical medium dependent (PMD), and physi- Supports 10BASE-T, 100BASE-TX, and 100BASE-FX cal coding sub-layer (PCS) functions. It also has on-chip with far-end-fault (FEF) detection 10BASE-T output filtering. This eliminates the need for Supports power-down and power-saving modes external filters and allows a single set of line magnetics to be Configurable through MII serial management ports or via used to meet requirements for both 100BASE-TX and external control pins 10BASE-T. Supports auto-negotiation and manual selection for The KS8721CL automatically configures itself for 100Mbps 10/100Mbps speed and full-/half-duplex modes or 10Mbps and full- or half-duplex operation, using an on-chip On-chip, built-in, analog front-end filtering for both auto-negotiation algorithm. It is the ideal physical layer 100BASE-TX and 10BASE-T transceiver for 100BASE-TX/10BASE-T applications. Available in Lead-free and Industrial Temperature packages. Functional Diagram 4B/5B Encoder NRZ/NRZI Scrambler TXD3 MLT3 Encoder 10/100 TX+ Parallel/Serial TXD2 Transmitter Pulse TXD1 TX- Shaper TXD0 Parallel/Serial TXER Manchester Encoder TXC TXEN MII/RMII Adaptive EQ CRS Registers RX+ Base Line 4B/5B Decoder COL 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 ACTIVITY 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 KS8721CL Micrel, Inc. Features (continued) Ordering Information Part Number Temp. Range Package Lead Finish LED outputs for link, activity, full-/half-duplex, and speed Supports back-to-back, FX to TX for media converter KS8721CL 0C to +70C 48-Pin LQFP Standard applications KSZ8721CL 0C to +70C 48-Pin LQFP Lead-free Supports MDI/MDI-X auto-crossover Commercial temperature range: 0C to +70C Industrial temperature range: 40C to +85C Available in 48-pin LQFP M9999-041405 2 April 2005