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




Advanced Micro Devices, Inc






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型式 数量 D/C・lead 備考 選択
AM79C874VC 26個 00+04+ N/A
AM79C874VC 3394個    
AM79C874VC 61個    
AM79C874VC 43個    


型式 数量 D/C・lead 備考 選択
AM79C874VC 333個 00  
AM79C874VC 317個    
AM79C874VC 56個    
AM79C874VC1LP 99個    
AM79C874VC1LP 4個