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ICS1892 bảng dữ liệu(PDF) 121 Page - Integrated Circuit Systems

tên linh kiện ICS1892
Giải thích chi tiết về linh kiện  10Base-T/100Base-TX Integrated PHYceiver
PDF  148 Pages
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nhà sản xuất  ICST [Integrated Circuit Systems]
Trang chủ  http://www.icst.com
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ICS1892 bảng dữ liệu(HTML) 121 Page - Integrated Circuit Systems

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Chapter 10
DC and AC Operating Conditions
ICS1892, Rev. D, 2/26/01
February 26, 2001
121
ICS1892
© 2000-2001, Integrated Circuit Systems, Inc.
All rights reserved.
10.3
Recommended Component Values
Table 10-3 lists the recommended component values for the ICS1892.
Note:
Do not put bypass capacitors across the 10TCSR or 100TCSR resistors. The bypass capacitor will
cause the bandgap circuit to oscillate.
† There are two IEEE Std 802.3 requirements that drive the tolerance for the frequency of the crystal.
• Clause 22.2.2.1 requires the MII TX_CLK to have an accuracy of ± 100 ppm.
• Clause 24.2.3.4 is more stringent. It requires the code-bit timer to have an accuracy of 0.005% (that is, ±50 ppm).
Table 10-3.
Recommended Component Values
Parameter
Minimum
Typical
Maximum
Tolerance
Units
Crystal Frequency
–
25
–
± 50 ppm †
MHz
10TCSR Resistor Value
–
2.0k
–
1%
Ω
100TCSR Resistor Value
–
7.15k
–
1%
Ω
LED Resistor Value
510
1k
10k
–
Ω



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