參數(shù)資料
型號: ICS1892Y-10
英文描述: 10Base-T/100Base-TX Integrated PHYceiver
文件頁數(shù): 121/148頁
文件大?。?/td> 816K
代理商: ICS1892Y-10
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%
100TCSR Resistor Value
7.15k
1%
LED Resistor Value
510
1k
10k
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