GWIXP425BCT datasheet(83/134 Pages) INTEL

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Intel® IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor

Datasheet

March 2005

Document Number: 252479, Revision: 005

5.2.2

VCCPLL2 Requirement

A parallel combination of a 10-nF capacitor — for bypass — and a 200-nF capacitor — for a first-

order filter with a cut-off frequency below 30 MHz — must be connected to the VCCPLL2 pin of the

IXP42X product line and IXC1100 control plane processors.

The ground of both capacitors should be connected to the nearest VSS supply pin. Both capacitors

should be located less than 0.5 inch away from the VCCPLL2 pin and the associated VSS pin. In

order to achieve the 200-nF capacitance, a parallel combination of two 100-nF capacitors may be

used as long as the capacitors are placed directly beside each other.

5.2.3

VCCOSCP Requirement

A single 170-nF capacitor must be connected between the VCCP_OSC pin and VSSP_OSC pin of the

IXP42X product line and IXC1100 control plane processors. This capacitor value provides both

bypass and filtering.

Figure 9.

VCCPLL1 Power Filtering Diagram

1.3 V

Intel

® IXP42X

Product Line /

Intel

® IXC1100

Control Plane

Processor

10 nF

VSS

VCCPLL1

100 nF

VSS

B1680-03

Figure 10.

VCCPLL2 Power Filtering Diagram

Intel

® IXP42X

Product Line /

Intel

® IXC1100

Control Plane

Processor

1.3 V

10 nF

VSS

VCCPLL2

100 nF

VSS

B1681-03

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