ICS1893BY-10 Data Sheet - Release
Chapter 9 DC and AC Operating Conditions
9.3 Recommended Component Values
Table 9-3. Recommended Component Values for ICS1893BY-10
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 9-1
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 9-1. ICS1893BY-10 10TCSR and 100TCSR
ICS1893BY-10
VDD
12
10TCSR
13
100TCSR
14
12.1 KΩ 1%
VDD
10TCSR
2.0KΩ 1%
100TCSR
1.54KΩ 1%
ICS1893BY-10 Rev A 3/24/04
March, 2004
Copyright © 2004, Integrated Circuit Systems, Inc.
All rights reserved.
116
ICSI [ INTEGRATED CIRCUIT SOLUTION INC ]
