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1893CF 参数 Datasheet PDF下载

1893CF图片预览
型号: 1893CF
PDF下载: 下载PDF文件 查看货源
内容描述: [Interface Circuit, 1-Trnsvr, CMOS, PDSO48, 0.300 MM INCH, SSOP-48]
分类和应用: 网络接口电信集成电路电信电路光电二极管
文件页数/大小: 136 页 / 1040 K
品牌: IDT [ INTEGRATED DEVICE TECHNOLOGY ]
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ICS1893AF Data Sheet - Release  
Chapter 6 Interface Overviews  
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  
Crystal  
REF_OUT  
46  
REF_IN  
47  
25.000MHz  
33 pF  
33 pF  
Oscillator  
REF_OUT  
46  
REF_IN  
47  
NC  
33 Ohm  
CMOS  
25.000  
MHz  
10 pF  
ICS1893AF,
Copyright © 2004, Integrated Circuit Systems, Inc.  
All rights reserved.  
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