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USB2250 데이터시트(PDF) 34 Page - SMSC Corporation

부품명 USB2250
상세설명  Ultra Fast USB 2.0 Multi-Format Flash Media Controller
PDF  36 Pages
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제조업체  SMSC [SMSC Corporation]
홈페이지  http://www.smsc.com
Logo SMSC - SMSC Corporation

USB2250 데이터시트(HTML) 34 Page - SMSC Corporation

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Ultra Fast USB 2.0 Multi-Format Flash Media Controller
Datasheet
Revision 2.6 (05-08-08)
34
SMSC USB2250/51/59
DATASHEET
Chapter 8 AC Specifications
8.1
Oscillator/Clock
Crystal: Parallel Resonant, Fundamental Mode, 24 MHz
± 100ppm.
External Clock: 50% Duty cycle
± 10%, 24/48 MHz ± 100ppm, Jitter < 100ps rms.
Figure 8.1 Typical Crystal Circuit
Note: CB equals total board/trace capacitance.
Figure 8.2 Formula to Find Value of C1 and C2
XTAL1
(CS1 =
CB + CXTAL )
XTAL2
(CS2 =
CB + CXTAL )
C1
C2
CL
1Meg
Crystal
(C1 + CS1) x (C2 + CS2)
(C1 + CS1 + C2 + CS2)
CL
=



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