AMD AM79C875 overview
AMD AM79C875 NetPHY™ 4LP Low Power Quad 10/100-TX/FX Ethernet Transceiver The NetPHY™ 4LP device is a highly integrated, low power 10BASE-T/100BASE-TX/FX Qu...
Product details
Manufactured byAMD
Product typeEthernet Transceiver
DescriptionAMD AM79C875 NetPHY™ 4LP Low Power Quad 10/100-TX/FX Ethernet Transceiver
OverviewThe 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 Parallel Detection and Next Page. Port 3 can be configured 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 decreases transmit power consumption and reduces device power consumption to 1.2 W typical.The NetPHY™ 4LP device offers an optimized pinout for network applications. RMII pins can be routed directly to the MAC and TX/RX media pins are routed directly 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 hybrid 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 repeater/switch board, thus requiring minimum external components.For ease of system and chip setup and testing, the NetPHY™ 4LP device offers loopback and various advanced testing and monitoring capabilities.The NetPHY™ 4LP 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 environment such as enclosures with restricted air flow or outdoor equipment.
Key FeaturesFour 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 AutoNegotiation 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)
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AMD
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Product type
Ethernet Transceiver
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