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ICS1893CFILF 数据表(PDF) 20 Page - Integrated Circuit Systems |
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ICS1893CFILF 数据表(HTML) 20 Page - Integrated Circuit Systems |
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20 / 126 page  ICS1893CF, Rev. F, 03/01/07 Mar. 2007 20 Chapter 5 Interface Overviews ICS1893CF Data Sheet - Release Copyright © 2007, Integrated Device Technology, Inc. All rights reserved. 5.4 Clock Reference Interface The REF_IN pin provides the ICS1893CF Clock Reference Interface. The ICS1893CF 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 ICS1893CF 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 5.2. Figure 5-2. 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 ICS1893CF ICS1893CF |
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