IXP45X datasheet(105/148 Pages) INTEL

105 / 148 page

Intel® IXP45X and Intel® IXP46X Product Line of Network Processors

August 2006

Datasheet

Document Number: 306261-004US

105

Datasheet—Intel® IXP45X and Intel® IXP46X Product Line of Network Processors

5.2.3

VCCPLL3 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

VCCPLL3 pin of the IXP45X/IXP46X network 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 VCCPLL3 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.

5.2.4

OSC_VCCP Requirement

A single, 170-nF capacitor must be connected between the OSC_VCCP pin and

OSC_VSSP pin of the IXP45X/IXP46X network processors. This capacitor value provides

both bypass and filtering.

When 170 nF is an inconvenient size, capacitor values between 150 nF to 200 nF can

be used with little adverse effects, assuming that the effective series resistance of the

200-nF capacitor is under 50 mΩ.

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.

OSC_VSSP is made up with two pins, AE11 and AE12. Ensure that both pins are

connected as shown in Figure 12.

Figure 10.

VCCPLL2 Power Filtering Diagram

Vc c

10 n F

V SS

V CC P L L 2

1 00 nF

V SS

In te l®

I XP4 5 X / I XP4 6 X

Ne t w o r k

P r o c e sso r s

Figure 11.

VCCPLL3 Power Filtering Diagram

Vc c

In t e l®

IX P 45X /I X P 46X

Ne tw o r k

P r oc es s o r s

10 nF

V SS

V CCP L L 3

100 nF

V SS

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