IXP45X INTEL [Intel Corporation], IXP45X Datasheet - Page 105

• Manufacturer Part Number: IXP45X
• Description: Product Line of Network Processors
• Manufacturer: INTEL [Intel Corporation]

Datasheet—Intel
Figure 10.
5.2.3
Figure 11.
5.2.4
August 2006
Document Number:
V
V
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
V
The ground of both capacitors should be connected to the nearest V
capacitors should be located less than 0.5 inch away from the V
associated V
of two 100-nF capacitors may be used as long as the capacitors are placed directly
beside each other.
V
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
®
CCPLL3
CCPLL2
CCPLL3
306261-004US
IXP45X and Intel
CCPLL3
1 0 n F
V c c
pin of the IXP45X/IXP46X network processors.
1 0 n F
Power Filtering Diagram
Power Filtering Diagram
V c c
Requirement
V
SS
V
S S
pin. In order to achieve the 200-nF capacitance, a parallel combination
S S
®
IXP46X Product Line of Network Processors
1 0 0 n F
Figure
1 0 0 n F
12.
Intel
®
IXP45X and Intel
1 0 0 n F
1 0 0 n F
V
V
C C P L L 2
C C P L L 3
V
V
®
S S
S S
IXP46X Product Line of Network Processors
I X P 4 5 X / I X P 4 6 X
I X P 4 5 X / I X P 4 6 X
P r o c e s s o r s
P r o c e s s o r s
N e t w o r k
CCPLL3
N e t w o r k
I n t e l
I n t e l
SS
supply pin. Both
®
pin and the
®
Datasheet
105