WG82574IT S LBAC Intel, WG82574IT S LBAC Datasheet - Page 422

• Manufacturer Part Number: WG82574IT S LBAC
• Description: CONTROLLER, ENET, INTEL 82574IT, 64PQFN
• Manufacturer: Intel

Specifications of WG82574IT S LBAC

• Ethernet Type: IEEE 802.3, IEEE 802.3u, IEEE 802.3ab
• Supply Voltage Range: 3V To 3.6V
• Operating Temperature Range: -40°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

12.3
12.4
Table 85.
422
Power Sequencing
For proper and safe operation, the power supplies must follow the following rule:
This means that VDD3p3 MUST start ramping before AVDD1p8 and VDD1p0, but
VDD1p0 MIGHT reach its nominal operating range before AVDD1p8 and VDD3p3.
Basically, the higher voltages must be greater than or equal to the lower voltages. This
is necessary to avoid low impedance paths through clamping diodes and to eliminate
back-powering.
The same requirements apply to the power-down sequence.
Internal Power On Reset must be low throughout the time that the power supplies are
ramping. This guarantees that the MAC and PHY resets cleanly. While Internal Power
On Reset is low, reset to the PHY is also asserted. After the power supplies are valid,
Internal Power On Reset must remain low for at least
CLK125 clock from the PHY is running.
Power-On Reset
Power Detection Thresholds
V1a
V2a
V1b
V2b
• Power up sequence – 3.3 V dc -> 1.9 V dc -> 1.05 V dc
• Power down sequence 1.05 V dc -> 1.9 V dc->3.3 V dc
Symbol
High threshold for 3.3 V dc supply
Low threshold for 3.3 V dc supply
High threshold for 1.05 V dc supply
Low threshold for 1.05 V dc supply
VDD3p3 (3.3 V dc)  AVDD1p9 (1.9 V dc)  VDD1p0 (1.05 V dc)
Parameter
1.35
0.6
0.35
1.35
Min
Specifications
1.7
1.6
0.7
0.45
82574 GbE Controller—Electrical Specifications
Typ
2.0
1.9
0.75
0.6
Max
t
CLK125START
V dc
V dc
V dc
V dc
Units
to guarantee that the