ICS1893AF Data Sheet - Release
Chapter 10 DC and AC Operating Conditions
10.3 Recommended Component Values
Table 10-3. Recommended Component Values for ICS1893AF
Parameter
Minimum
Typical
Maximum
Tolerance
Units
MHz
Ω
Oscillator Frequency
10TCSR Resistor Value
100TCSR Resistor Value
LED Resistor Value
–
–
25
2.00k
–
–
50 ppm †
1%
1%
–
–
See Figure 10-1
1k
–
Ω
510
10k
Ω
† There are two IEEE Std. 802.3 requirements that drive the tolerance for the frequency of the oscillator.
• 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).
Figure 10-1. ICS1893AF 10TCSR and 100TCSR
Typical Board Layouts
10TCSR and 100TCSR Bias Resistors
ICS1893AF
VDD
14
10TCSR
15
100TCSR
16
12.1 KΩ 1%
VDD
10TCSR
100TCSR
1.54KΩ 1%
2.0KΩ 1%
Note:
1. The VDD connection to the 12.1K resistor can connect to any VDD.
ICS1893AF, Rev. D 10/26/04
October, 2004
Copyright © 2004, Integrated Circuit Systems, Inc.
All rights reserved.
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