參數(shù)資料
型號: EWIXP455ABT
廠商: INTEL CORP
元件分類: 微控制器/微處理器
英文描述: 266 MHz, RISC PROCESSOR, PBGA544
封裝: LEAD FREE, PLASTIC, BGA-544
文件頁數(shù): 21/163頁
文件大?。?/td> 1123K
代理商: EWIXP455ABT
Electrical Specifications
Intel IXP45X and Intel IXP46X Product Line of Network Processors Datasheet
May 2005
Document Number: 306261-002
117
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
VCCOSCP Requirement
A single, 170-nF capacitor must be connected between the VCCP_OSCP pin and VSSP_OSCP 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 m
.
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_OSCP is made up with two
pins, AD10 and AF10. 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 te l
IX P 45X / IX P 46X
Ne t w o r k
P r oc es s o r s
10 nF
V SS
V CC P L L 3
100 nF
V SS
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