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AM79C875KC Datasheet(PDF) 1 Page - Advanced Micro Devices |
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AM79C875KC Datasheet(HTML) 1 Page - Advanced Micro Devices |
1 / 48 page Publication# 22236 Rev: H Amendment/0 Issue Date: February 2003 Refer to AMD’s Website (www.amd.com) for the latest information. DATA SHEE T Am79C875 NetPHY™ 4LP Low Power Quad 10/100-TX/FX Ethernet Transceiver DISTINCTIVE CHARACTERISTICS ■ Four 10/100BASE-TX Ethernet PHY transceivers ■ Supports RMII (Reduced MII) interface ■ 125 meter (m) MLT-3 and Baseline Wander operation ■ Low power consumption — 1.3 Watt (W) typical (1:1 magnetics) — 1.2 W typical (1.25:1 magnetics) ■ Power management modes: — Selectable 1:1 or 1.25:1 transmit transformer — Unplugged - approximately 100 mW per port — Power Down - approximately 3 mW per port ■ Single 3.3 V power supply with 5 V I/O tolerance ■ Patent-pending DC restoration technique reduces baseline wander susceptibility ■ Full and half-duplex operation with full-featured Auto-Negotiation function ■ Next Page register support ■ Automatic Polarity Detection during Auto- Negotiation and 10BASE-T signal reception ■ Unique scramble seed per port reduces EMI in switch and repeater applications ■ One port supports 100BASE-FX function ■ Supports Inter Packet Gap as low as 40 ns for high throughput applications ■ No external filters or chokes required ■ Compliant with IEEE 802.3 standards for 100BASE-TX, 100BASE-FX, and 10BASE-T ■ Built-in loopback and test modes ■ Small 14 x 20 mm 100-pin PQR package ■ Small package allows side-by-side PHY layout — Fits neatly behind quad magnetics — Saves board space over larger 208 PQFP packages ■ Support for Industrial Temperature (-40°C to +85°C) GENERAL DESCRIPTION The NetPHY™ 4LP device is a highly integrated, low power 10BASE-T/100BASE-TX/FX Quad Ethernet transceiver. The NetPHY™ 4LP device includes integrated RMII, ENDECs, Scrambler/Descrambler, and full-featured Auto-Negotiation with support for Par- allel Detection and Next Page. Port 3 can be config- ured as a 100BASE-FX transmitter to output an NRZI PECL level signal. Each receiver has an adaptive equalizer/DC restoration circuit for accurate clock/data recovery on the 100BASE-TX signal at different cable lengths and can perform to 125 m and beyond. The NetPHY™ 4LP device operates on a 3.3 V supply and offers 5 V I/O tolerance for mixed signal designs. Power consumption is 1.3 W typical for the device, or 0.3 W per port using 1:1 magnetics. The NetPHY™ 4LP device can use 1.25:1 magnetics, which de- creases transmit power consumption and reduces de- vice power consumption to 1.2 W typical. The NetPHY™ 4LP device offers an optimized pinout for network applications. RMII pins can be routed di- rectly to the MAC and TX/RX media pins are routed di- rectly to the magnetics. Direct routing of high speed traces is imperative for project system design and EMI noise reduction. The NetPHY™ 4LP device’s on-chip input filtering and output waveshaping eliminates the need of external hy- brid filters for media connection. Integrated LED logic allows three LEDs per port to be driven directly. These features greatly simplify the design of a 100BASE-X re- peater/switch board, thus requiring minimum external components. For ease of system and chip setup and testing, the Net- PHY™ 4LP device offers loopback and various ad- vanced testing and monitoring capabilities. The NetPHY™ 4LP device is available in the Commer- cial (0°C to 70°C) or Industrial (-40°C to +85°C) tem- perature ranges. The Industrial temperature range is well suited to environment such as enclosures with re- stricted air flow or outdoor equipment. |
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