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ICS1893AGILF Datasheet(PDF) 28 Page - Integrated Circuit Systems |
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ICS1893AGILF Datasheet(HTML) 28 Page - Integrated Circuit Systems |
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28 / 135 page  ICS1893AG, Rev A 04/14/05 April, 2005 28 Chapter 6 Interface Overviews ICS1893AG Data Sheet - Preliminary Copyright © 2005, Integrated Circuit Systems, Inc. All rights reserved. 6.4 Clock Reference Interface The REF_IN pin provides the ICS1893AG Clock Reference Interface. The ICS1893AG 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 ICS1893AG 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 25 MHz crystal may be used. The Oscillator specifications are shown in Table 6.1. Figure 6-3. Crystal or Oscillator Operation 33 pF REF_IN 55 REF_OUT 54 25.000MHz 33 pF 10 pF REF_IN 55 REF_OUT 54 CMOS 25.000 MHz 33 Ohm NC Crystal Oscillator |
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