参数资料
型号: EWIXP455ABT
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 266 MHz, RISC PROCESSOR, PBGA544
封装: LEAD FREE, PLASTIC, BGA-544
文件页数: 20/163页
文件大小: 1123K
代理商: EWIXP455ABT
Electrical Specifications
May 2005
Intel IXP45X and Intel IXP46X Product Line of Network Processors Datasheet
116
Document Number: 306261-002
5.2
VCCPLL1, VCCPLL2, VCCPLL3, VCCOSCP, VCCOSC Pin
Requirements
To reduce voltage-supply noise on the analog sections of the IXP45X/IXP46X network processors,
the phase-lock loop circuits (VCCPLL1, VCCPLL2, VCCPLL3) and oscillator circuit (VCCOSCP,
VCCOSC) require isolated voltage supplies.
The filter circuits for each supply are shown in the following sections.
5.2.1
VCCPLL1 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 VCCPLL1 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 VCCPLL1 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.
5.2.2
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
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 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.
Figure 9.
VCCPLL1 Power Filtering Diagram
Vc c
In te l
IX P 45X /IX P 46 X
Ne tw o r k
P r oc es s o r s
10 nF
V SS
V CC P L L 1
100 nF
1 00 nF
V SS
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