IXP42X datasheet(75/112 Pages) INTEL

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Intel® IXP42X Product Line and IXC1100 Control Plane Processor

Electrical Specifications

Datasheet

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.

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 10.

Figure 8.

VCCPLL1 Power Filtering Diagram

1.3 V

Intel® IXP4XX

Product Line /

Intel® IXC1100

Control Plane

Processor

10 nF

CCPLL1

100 nF

B1680-02

Figure 9.

VCCPLL2 Power Filtering Diagram

Intel® IXP4XX

Product Line /

Intel® IXC1100

Control Plane

Processor

1.3 V

10 nF

CCPLL2

100 nF

B1681-02

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