GWIXP425BDT datasheet(84/134 Pages) INTEL

84 / 134 page

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

March 2005

Datasheet

Document Number: 252479, Revision: 005

When 170 nF is an inconvenient size, capacitor values between 150 nF to 200 nF could be used

with little adverse effects, assuming that the effective series resistance of the 200-nF capacitor is

under 50 m

Ω.

In order to achieve a 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. VSSP_OSC consists of two pins,

AD10 and AF10. Ensure that both pins are connected as shown in Figure 11.

5.2.4

VCCOSC 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 33 MHz — must be connected to both of the VCCOSC

pins of the IXP42X product line and IXC1100 control plane processors.

The grounds of both capacitors should be connected to the VSSOSC supply pin. Both capacitors

should be located less than 0.5 inch away from the VCCOSC pin and the associated VSSOSC pin.

In order to achieve a 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.

Figure 11.

VCCOSCP Power Filtering Diagram

Intel

® IXP42X

Product Line /

Intel

® IXC1100

Control Plane

Processor

3.3 V

170 nF

VSS

VCCOSCP

VSSOSCP

B1675-04

Figure 12.

VCCOSC Power Filtering Diagram

Intel

® IXP42X

Product Line /

Intel

® IXC1100

Control Plane

Processor

1.3 V

10 nF

VSS

100 nF

B1676-03

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