Intel Xeon User Manual

Design Guide 183
Platform Power Delivery Guidelines
12.4.3 Intel
®
ICH3-S Power Rails
The ICH3-S refers to it’s standby rails as suspend. Table 12-8 lists the nomenclature.
12.4.4 Intel
®
ICH3-S Decoupling Recommendations
The ICH3-S 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 decoupling capacitors specified in
Table 12-9 to ensure that the component maintains stable supply voltages. The capacitors should be
placed as close to the package as possible (200 mils nominal). It is recommended that for prototype
board designs, the designer include pads for extra power plane decoupling capacitors.
Figure 12-22. Example 3.3 V/V5REF Sequencing Circuitry
To System
5 V Supply
To System
VCC Supply
(3.3 V)
1 kΩ
VREF
1 µF
Table 12-8. ICH3-S Power Rail Terminology
Platform Terminology ICH3-S Terminology
5 V Standby 5 V Suspend
3.3 V Standby 3.3 V Suspend
1.8 V Standby 1.8 V Suspend

Intel Xeon Specifications

General

Brand	Intel
Model	Xeon
Category	Processor
Language	English