WG82574L S LBA9 Intel, WG82574L S LBA9 Datasheet - Page 484

• Manufacturer Part Number: WG82574L S LBA9
• Description: CONTROLLER, ENET, INTEL 82574L, 64PQFN
• Manufacturer: Intel

Specifications of WG82574L S LBA9

• Ethernet Type: IEEE 802.3, IEEE 802.3u, IEEE 802.3ab
• Supply Voltage Range: 3V To 3.6V
• Operating Temperature Range: 0°C To +85°C
• Digital Ic Case Style: QFN
• No. Of Pins: 64
• Package / Case: QFN
• Interface Type: I2C, JTAG, PCI, SPI
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

484
10/100/
1000Base-T
Interface
Magnetics Module
(Discrete Option
with
RJ-45 Connector)
10/100/
1000Base-T
Interface
Chassis Ground
Section
Bob Smith termination: use 4 x 75  resistors
connected to each cable-side center tap.
Bob Smith termination: use an EFT capacitor
attached to the chassis ground. Suggested
values are 1500 pF/2 KV or 1000 pF/3 KV.
Supply 1.9 V dc to the system side
transformer center taps and use 0.01 F
bypass capacitors. If a LAN switch is used or
the trace length from the 82574 is greater
than four inches. It might be necessary to
boost the voltage at the center tap with a
separate power supply to optimize MDI
performance.
Ensure there is high voltage isolation to line
side of the MDI traces and the Bob Smith
termination.
Ensure there are no termination resistors in
the path between the 82574 and the
magnetics.
Provide a separate chassis ground to connect
the shroud of the RJ-45 connector and to
terminate the line side of the magnetic
module.
Place pads for approximately 4-6 stitching
capacitors to bridge the gap from chassis
ground to signal ground.
Check Items
82574 GbE Controller—Board Layout and Schematic Checklists
Terminate pair-to-pair common mode impedance of the
CAT5 cable.
These capacitors provide high voltage isolation.
1.9 V dc at the center tap biases the 82574's output
buffers. Capacitors with low ESR should be used.
The Bob Smith termination and the MDI traces should
be >= 80 mils away from all components and traces on
the same layer.
Do not use less than 10 mils of single ply woven epoxy
(FR-4). There can be small air pockets between woven
fibers. Use thicker, two ply, or three ply epoxy (FR-4).
The 82574 has an internal termination network.
This design improves EMI behavior.
Typical values range from 0.1F to 4.7F. The correct value
should be determined experimentally to improve EMI. Past
experiments have shown they are not required in some
designs.
Remarks