Intel® P64H2 Power Requirements; Intel® P64H2 Current Requirements; Intel® P64H2 Decoupling Requirements; Intel® P64H2 Max Sustained Currents - Intel Xeon Design Manual

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12.5 Intel
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12.5.1 Intel
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Table 12-10. Intel
1.8V at 33 MHz PCI (both segments)
1.8V at 66 MHz PCI/PCI-X (both segments)
1.8V at 100 MHz PCI-X (both segments)
1.8V at 133 MHz PCI-X (both segments)
3.3V at 33 MHz PCI 6 loads (both segments)
3.3V at 66 MHz PCI 2 loads (both segments)
3.3V at 66 MHz PCI-X 4 loads (both segments)
3.3V at 100 MHz PCI-X 2 loads (both segments)
3.3V at 133 MHz PCI-X 1 load (both segments)
For more information, refer to the P64H2 Thermal Design Guide.
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12.5.2 Intel
The P64H2 is capable of generating large current swings when switching between logic high and
logic low. This condition could cause the component voltage rails to drop below specified limits.
To avoid this, ensure that the appropriate amount of bulk capacitance is added in parallel to the
voltage input pins. It is recommended that the developer use the amount of decoupling capacitors
specified in the table below to ensure the component maintains stable supply voltages. The
capacitors should be placed as close to the package as possible.
Table 12-11. Decoupling Capacitor Recommendations
Power Plane/Pins
1.8V Core (VCC)
1.8V HI 2.0
(VCC_1.8)
3.3V PCI/PCI-X
(VCC_3.3)
NOTES:
1. In the case of the 20 0.1 µ F decoupling capacitors for the Vcc3.3V plane, it is recommended that at least five
of these capacitors be placed near the die on the back of the board between ground and the VCC-PCI vias,
as shown in
resonance frequency at 66Hz.
Design Guide
P64H2 Power Requirements
P64H2 Current Requirements
P64H2 Max Sustained Currents
Voltage at PCI/PCI-X Interface
P64H2 Decoupling Requirements
Number of
High-Frequency
Decoupling
Capacitors
8
2
1
20
6
Figure 12-23. This is not a strict requirement, but is recommended to reduce the power
Platform Power Delivery Guidelines
Max Sustained Current
High-Frequency Number of Bulk
Capacitor Decoupling
Values Capacitors
0.1 µF 2
1.0 µF 1
0.1 µF 2
1.0 µF 1
1970 mA
2170 mA
2550 mA
2660 mA
930 mA
690 mA
1300 mA
1050 mA
770 mA
Bulk
Capacitor Values
4 µF (near P64H2)
100 µF (near regulator)
4 µF (near P64H2)
100 µF (near regulator)
185