ICS1892 Integrated Circuit Systems, ICS1892 Datasheet - Page 121
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ICS1892
Manufacturer Part Number
ICS1892
Description
10Base-T/100Base-TX Integrated PHYceiver
Manufacturer
Integrated Circuit Systems
Datasheet
1.ICS1892.pdf
(148 pages)
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10.3 Recommended Component Values
ICS1892, Rev. D, 2/26/01
Table 10-3
Table 10-3. Recommended Component Values
Note:
† There are two IEEE Std 802.3 requirements that drive the tolerance for the frequency of the crystal.
Crystal Frequency
10TCSR Resistor Value
100TCSR Resistor Value
LED Resistor Value
•
•
ICS1892
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).
Do not put bypass capacitors across the 10TCSR or 100TCSR resistors. The bypass capacitor will
cause the bandgap circuit to oscillate.
Parameter
lists the recommended component values for the ICS1892.
© 2000-2001, Integrated Circuit Systems, Inc.
All rights reserved.
Minimum
510
–
–
–
Typical
121
7.15k
2.0k
25
1k
Maximum
10k
–
–
–
Chapter 10 DC and AC Operating Conditions
± 50 ppm †
Tolerance
1%
1%
–
February 26, 2001
Units
MHz
Ω
Ω
Ω
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