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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  
If a crystal is used as the clocking source, connect it to both the Ref_in (pin 47) and Ref_out (pin 46) pins  
of the ICS1893AF. A pair of bypass capacitors on either side of the crystal are connected to ground. The  
crystal is used in the parallel resonance or anti-resonance mode. The value of the bypass caps serve to  
adjust the final frequency of the crystal oscillation. Typical applications would use 33pF bypass caps. The  
exact value will be affected by the board routing capacitance on Ref_in and Ref_out pins. Smaller bypass  
capacitors raise the frequency of oscillation. Once the exact value of bypass capacitance is established it  
will be the same for all boards using the same specification crystal. The best way to measure the crystal  
frequency is to measure the frequency of TXCLK (pin 37) using a frequency counter with a 10 second  
sample. Using TXCLK prevents affecting the crystal frequency by the measurement. The crystal  
specification is shown in Table 6.1.  
Table 6-1. 25MHz Crystal Specification  
Specifications  
Symbol Minimum  
Typical Maximum  
Unit  
Fundamental Frequency  
(tolerance is sum of freq.,  
temp., stability and aging.)  
F0  
24.99875 25.00000 25.00125  
MHz  
Freq. Tolerance  
F/f  
CIN  
50  
ppm  
pF  
Input Capacitance  
3
Table 6-2. 25MHz Oscillator Specification  
Specifications  
Symbol Minimum  
Typical Maximum  
24.99875 25.00000 25.00125  
50  
Unit  
MHz  
ppm  
%
Output Frequency  
F0  
Freq. Stability (including aging) F/f  
Duty cycle CMOS level  
one-half VDD  
Tw/T  
35  
65  
VIH  
2.79  
Volts  
Volts  
pS  
VIL  
0.33  
500  
Period Jitter  
Input Capacitance  
Tjitter  
CIN  
3
pF  
ICS1893AF
Copyright © 2004, Integrated Circuit Systems, Inc.  
All rights reserved.  
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