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PGA370 Processor Design Guidelines
2.2.9
Voltage Regulation Differences
®
The Intel
voltage regulator to be compliant with Intel VRM 8.4 DC-DC Converter Design Guidelines
revision 1.5 or greater. Important points to note regarding VRM 8.4 are:
•
Intel
processor (FC-PGA) operates at 1.5V, and Intel
•
Requirement for VRM 8.4 to support the Intel
650 MHz has changed from previous processors. Transient and static tolerances are tighter
than VRM 8.2.
•
Additional motherboard decoupling required to meet VRM 8.4.
2.2.10
Decoupling Guidelines for Flexible PGA370 Designs
These are preliminary decoupling guidelines for Flexible PGA370 designs and are estimated to
meet VRM 8.4 V1.6 flexible motherboard guidelines.
2.2.10.1
VCC
CORE
•
Ten or more 4.7 uF capacitors in 1206 packages.
All capacitors should be placed within the PGA370 socket cavity and mounted on the primary
side of the motherboard. The capacitors are arranged to minimize the overall inductance
between VCC
Figure 2-6. Capacitor Placement on the Motherboard
2-12
®
III (FC-PGA w/256K L2 cache) processor requires the VRM or on-board
Pentium
Celeron processor (PPGA) operates at VccCORE of 2.0V, Intel
Decoupling Design
/Vss power pins, as shown in
CORE
®
®
III-256K operates at 1.6V.
Pentium
®
®
Pentium
III processor at speeds greater than
Figure
2-6.
®
Intel
810A3 Chipset Design Guide
®
Celeron™
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