WG82574L S LBA8 Intel, WG82574L S LBA8 Datasheet - Page 443

• 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

Design Considerations—82574 GbE Controller
13.7
13.7.1
Figure 75.
13.7.1.1
82574 Power Supplies
The 82574 requires three power rails: 3.3 V dc, 1.9 V dc, and 1.05 V dc (see
section
power can be derived from the 3.3 V dc supply and regulated locally using external
regulators. If the LAN wake capability is used, all voltages must remain present during
system power down. Local regulation of the LAN voltages from system 3.3 Vmain and
3.3 Vaux voltages is recommended. Refer to
information about power supply sequencing rules and intended design options for
power solutions.
External voltage regulators need to generate the proper voltage, supply current
requirements (with adequate margin), and provide the proper power sequencing.
82574 GbE Controller Power Sequencing
Designs must comply with power sequencing requirements to avoid latch-up and
forward-biased internal diodes (see
The general guideline for sequencing is:
For power down, there is no requirement (only charge that remains is stored in the
decoupling capacitors).
Power Sequencing Guideline
Power Up Sequence (External LVR)
The board designer controls the power up sequence with the following stipulations (see
Figure
1. Power up the 3.3 V dc rail.
2. Power up the 1.9 V dc next.
3. Power up the 1.05 V dc rail last.
• 1.9 V dc must not exceed 3.3 V dc by more than 0.3 V dc.
• 1.05 V dc must not exceed 1.9 V dc by more than 0.3 V dc.
• 1.05 V dc must not exceed 3.3 V dc by more than 0.3 V dc.
76):
5.4). A central power supply can provide all the required voltage sources or the
Figure
75).
section 12.3
VDD3p3
AVDD1p9
VDD1p0
and
section 12.5
for detailed
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