D A TA SH EE T Am79C874 NetPHY-1LP Low Power 10/100-TX/FX Ethernet Transceiver Supports 1:1 or 1.25:1 transmit transformer DISTINCTIVE CHARACTERISTICS Using a 1.25:1 ratio saves 20% transmit 10/100BASE-TX Ethernet PHY device with power consumption 100BASE-FX fiber optic support No external filters or chokes required Typical power consumption of 0.3 W Waveshaping no external filter required Sends/receives data reliably over cable lengths greater than 130 meters Full and half-duplex operation with full-featured Auto-Negotiation function MII mode supports 100BASE-X and 10BASE-T LED indicators: Link, TX activity, RX activity, 7-Wire (General Purpose Serial Interface (GPSI)) Collision, 10 Mbps, 100 Mbps, Full or Half mode supports 10BASE-T Duplex Three PowerWise management modes (from MDIO/MDC operates up to 25 MHz 300 mW typical) Automatic Polarity Detection Power down: only management responds Typical power = 3 mW Built-in loopback and test modes Unplugged: no cable, no receive clock Single 3.3-V power supply with 5-V I/O tolerance Typical power = 100 mW 12 mm x 12 mm 80-pin TQFP package Idle wire: no wire signal, no receiver power Support for industrial temperature Typical power = 285 mW MAC saves over (-40C to +85C) 100 mW GENERAL DESCRIPTION The Am79C874 NetPHY-1LP device provides the interface. Auto-Negotiation determines the network physical (PHY) layer and transceiver functions for one speed and full or half-duplex operation. Automatic po- 10/100 Mbps Ethernet port. It delivers the dual benefits larity correction is performed during Auto-Negotiation of CMOS low power consumption and small package and during 10BASE-T signal reception. size. Operating at 3.3 V, it consumes only 0.3 W. Three Multiple LED pins are provided for front panel status power management modes provide options for even feedback. One option is to use two bi-color LEDs to lower power consumption levels. The small 12x12 mm show when the device is in 100BASE-TX or 10BASE-T 80-pin PQL package conserves valuable board space mode (by illuminating), Half or Full Duplex (by the on adapter cards, switch uplinks, and embedded Ether- color), and when data is being received (by blinking). net applications. Individual LEDs can indicate link detection, collision The NetPHY-1LP 10/100 Mbps Ethernet PHY device is detection, and data being transmitted. IEEE 802.3 compliant. It can receive and transmit data The NetPHY-1LP device needs only one external 25- reliably at over 130 meters. It includes on-chip input fil- MHz oscillator or crystal because it uses a dual-speed tering and output waveshaping for unshielded twisted clock synthesizer to generate all other required clock pair operation without requiring external filters or domains. The receiver has an adaptive equalizer/DC chokes. The NetPHY-1LP device can use 1:1 isolation restoration circuit for accurate clock/data recovery from transformers or 1.25:1 isolation transformers. 1.25:1 the 100BASE-TX signal. isolation transformers provide 20% lower transmit The NetPHY-1LP device is available in the commercial power consumption. A PECL interface is available for (0C to +70C) or industrial (-40C to +85C) tempera- 100BASE-FX applications. ture ranges. The industrial temperature range is well Interface to the Media Access Controller (MAC) layer is suited to environments, such as enclosures with re- established via the standard Media Independent Inter- stricted air flow or outdoor equipment. face (MII), a 5-bit symbol interface, or a 7-wire (GPSI) Publication 22235 Rev: K Always check www.amd.com for the latest information. Issue Date: May 2005D A TA SH EE T BLOCK DIAGRAM 100TX PCS PMA TP PMD Framer Clock Recovery MLT-3 TX+ Link Monitor BLW Carrier Detect 4B/5B Signal Detect Stream Cipher 100RX TX- MII Data 25 MHz Interface Mux Interface 10TX 10BASE-T 100BASE-X Transformer 10RX MAC RX+ RX- MDC/MDIO Control/Status 20 MHz RX FLP MII Serial Management PLL Clk Generator Auto- 25 MHz Interface and Registers Test LED Control Negotiation PHYAD 4:0 XTL+ XTL- CLK TEST LED Drivers 22236G-1 2 Am79C874 22235K