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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ICS1893AFILFT датащи(PDF) 29 Page - Renesas Technology Corp |
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ICS1893AFILFT датащи(HTML) 29 Page - Renesas Technology Corp |
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29 / 137 page  Chapter 6 Interface Overviews ICS1893AF, Rev. D 10/26/04 October, 2004 29 ICS1893AF Data Sheet - Release Copyright © 2004, Integrated Circuit Systems, Inc. All rights reserved. 6.4 Clock Reference Interface The REF_IN pin provides the ICS1893AF Clock Reference Interface. The ICS1893AF requires a single clock reference with a frequency of 25 MHz ±50 parts per million. This accuracy is necessary to meet the interface requirements of the ISO/IEEE 8802-3 standard, specifically clauses 22.2.2.1 and 24.2.3.4. The ICS1893AF supports two clock source configurations: a CMOS oscillator or a CMOS driver. The input to REF_IN is CMOS (10% to 90% VDD), not TTL. Alternately, a 25MHz crystal may be used. The Oscillator specifications are shown in Table 6.1. Figure 6-3. Crystal or Oscillator Operation 33 pF REF_IN 47 REF_OUT 46 25.000MHz 33 pF 10 pF REF_IN 47 REF_OUT 46 CMOS 25.000 MHz 33 Ohm NC Crystal Oscillator |
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