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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ICS1892Y-10 датащи(PDF) 121 Page - Integrated Circuit Systems |
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ICS1892Y-10 датащи(HTML) 121 Page - Integrated Circuit Systems |
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121 / 148 page  Chapter 10 DC and AC Operating Conditions ICS1892, Rev. D, 2/26/01 February 26, 2001 121 ICS1892 © 2000-2001, Integrated Circuit Systems, Inc. All rights reserved. 10.3 Recommended Component Values Table 10-3 lists the recommended component values for the ICS1892. Note: Do not put bypass capacitors across the 10TCSR or 100TCSR resistors. The bypass capacitor will cause the bandgap circuit to oscillate. † There are two IEEE Std 802.3 requirements that drive the tolerance for the frequency of the crystal. • 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). Table 10-3. Recommended Component Values Parameter Minimum Typical Maximum Tolerance Units Crystal Frequency – 25 – ± 50 ppm † MHz 10TCSR Resistor Value – 2.0k – 1% Ω 100TCSR Resistor Value – 7.15k – 1% Ω LED Resistor Value 510 1k 10k – Ω |
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