ICS1893Y-10 Datasheet, PDF (122/150 Pages) –

ICS1893Y-10 Data Sheet - Release
Chapter 9 DC and AC Operating Conditions
9.3 Recommended Component Values
Table 9-3. Recommended Component Values for ICS1893Y-10
Parameter
Oscillator Frequency
10TCSR Resistor Value
100TCSR Resistor Value
LED Resistor Value
Minimum
–
–
–
510
Typical
25
2.00k
See Figure 9-1
1k
Maximum
–
–
–
10k
Tolerance
± 50 ppm †
1%
1%
–
Units
MHz
Ω
Ω
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. ICS1893Y-10 10TCSR and 100TCSR
VDD
7
VDD
ICS1893Y-
10TCSR
9
12.1 KΩ 1%
100TCSR
10
10TCSR
2.0KΩ 1%
100TCSR
1.54KΩ 1%
ICS1893Y-10 Rev F 1/20/04
Copyright © 2004, Integrated Circuit Systems, Inc.
All rights reserved.
122
January, 2004