Hot-selling and scarce AM79C875KD 4LP Low Power Quad 10/100-TX/FX Ethernet Transceiver QFP spot stock

Product Descriptions

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 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.

Product Features

■ 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)

Product Photos

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