FWIXP425AB Intel, FWIXP425AB Datasheet - Page 59

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FWIXP425AB

Manufacturer Part Number
FWIXP425AB
Description
Manufacturer
Intel
Datasheet

Specifications of FWIXP425AB

Core Operating Frequency
266MHz
Package Type
BGA
Pin Count
492
Mounting
Surface Mount
Operating Temperature (max)
85C
Operating Temperature (min)
-40C
Operating Temperature Classification
Industrial
Lead Free Status / Rohs Status
Not Compliant

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General PCB Guide—Intel
December 2007
Document Number: 252817- 008US
An example for a six-layer and eight-layer board is shown below. For stripline (signals
between planes), the stackup should be such that the signal line is closer to one of the
planes by a factor of five or more. Then the trace impedance is controlled
predominantly by the distance to the nearest plane.
the proposed stackup for the six- and eight-layer boards.
• High-speed circuits require multi-layer printed circuit boards;
• Symmetry is essential to keep the board stack-up symmetric about the center
• For best impedance control, have:
• For best noise control, route adjacent layers orthogonally. Avoid layer-to-layer
• Fabrication house must agree on design rules, including:
• The distance between the signal layer and ground (or power) should be minimized
parallelism.
to reduce the loop area enclosed by the return current
— Advantages:
— Disadvantages:
— This minimizes warping
— No more than two signal layers between every power/ground plane pair
— No more than one embedded micro-strip layer under the top/bottom layers
— Trace width, trace separation
— Drill/via sizes
— Use 0.7:1 ratio as a minimum.
• Lack of power/ground planes, resulting in unacceptable cross-talk
• Relatively high-impedance power distribution circuitry, resulting in noise on
• Controlled-impedance traces
• Low-impedance power distribution
• Higher cost
• More weight
• Manufactured by fewer vendors
®
For example: 5-mil traces, 7-mil prepreg thickness to adjacent power/ground
IXP42X product line and IXC1100 control plane processors
the power and ground rails
Intel
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
Figure 22
and
Hardware Design Guidelines
Figure 23
illustrate
59

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