WG82574L S LBA8 Intel, WG82574L S LBA8 Datasheet - Page 469

• Manufacturer Part Number: WG82574L S LBA8
• Manufacturer: Intel

Specifications of WG82574L S LBA8

• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: 0C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 64
• Lead Free Status / RoHS Status: Compliant

Board Layout and Schematic Checklists—82574 GbE Controller
LED Circuits
Mfg Test
Section
Basic recommendation is a single green LED
for activity and a dual (bi-color) LED for
speed. Many other configurations are possible.
LEDs are configurable through the NVM.
Connect LEDs to 3.3 V dc as indicated in
reference schematics.
Add current limiting resistors to LED paths.
The 82574 allows a JTAG Test Access Port to
enable an XOR tree test.
Check Items
Two LED configurations are compatible with integrated
magnetic modules. For the Link/Activity LED, connect
the cathode to the LED1 pin and the anode to VCC. For
the bi-color speed LED pair, have the LED2 signal drive
one end. The other end should be connected to LED0.
When LED2 is low, the orange LED is lit. When LED0 is
low, the green LED is lit.
Use 3.3 V dc AUX for designs supporting wake-up.
Consider adding one or two filtering capacitors per LED
for extremely noisy situations. Suggested starting
value is 470 pF.
Typical current limiting resistors are 250  to 330 
when using a 3.3 V dc supply. Current limiting resistors
are sometimes included with integrated magnetic
modules.
Because of pin sharing the 82574 cannot be used in a
JTAG chain. The JTAG pins must be individually driven
and sampled.
Remarks
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