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ICS1893 датащи(PDF) 124 Page - Integrated Circuit Systems

номер детали ICS1893
подробное описание детали  3.3-V 10Base-T/100Base-TX Integrated PHYceiver?
PDF  152 Pages
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производитель  ICST [Integrated Circuit Systems]
домашняя страница  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS1893 датащи(HTML) 124 Page - Integrated Circuit Systems

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ICS1893 Rev C 6/6/00
June, 2000
124
Chapter 10
DC and AC Operating Conditions
ICS1893 Data Sheet - Release
Copyright © 2000, Integrated Circuit Systems, Inc.
All rights reserved.
10.3
Recommended Component Values
† 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).
Note:
Although the 10TCSR and 100TCSR pins do not need to be bypassed, include placeholders for
bypass capacitors on a printed circuit board that uses the ICS1893.
Figure 10-1.
ICS1893 10TCSR and 100TCSR
Table 10-3.
Recommended Component Values for ICS1893
Parameter
Minimum
Typical
Maximum
Tolerance
Units
Oscillator Frequency
–
25
–
± 50 ppm †
MHz
10TCSR Resistor Value
–
2.00k
–
1%
Ω
100TCSR Resistor Value
–
See Figure 10-1
–
1%
Ω
LED Resistor Value
510
1k
10k
–
Ω
ICS1893
7
9
10
VDD
10TCSR
100TCSR
2.0K
Ω 1%
Leave place holder but do not install bypass capacitors.
VDD
12.1 K
Ω 1%
10TCSR
1.54K
Ω 1%
100TCSR



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