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ICS1893AFILF データシート(PDF) 111 Page - Renesas Technology Corp |
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ICS1893AFILF データシート(HTML) 111 Page - Renesas Technology Corp |
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111 / 137 page  Chapter 10 DC and AC Operating Conditions ICS1893AF, Rev. D 10/26/04 October, 2004 111 ICS1893AF Data Sheet - Release Copyright © 2004, 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). Figure 10-1. ICS1893AF 10TCSR and 100TCSR Table 10-3. Recommended Component Values for ICS1893AF 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 ICS1893AF 14 15 16 VDD 10TCSR 100TCSR 2.0K Ω 1% Note: 1. The VDD connection to the 12.1K resistor can connect to any VDD. VDD 12.1 K Ω 1% 10TCSR 1.54K Ω 1% 100TCSR Typical Board Layouts 10TCSR and 100TCSR Bias Resistors |
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