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USB2250 Datenblatt(PDF) 34 Page - SMSC Corporation |
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USB2250 Datenblatt(HTML) 34 Page - SMSC Corporation |
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34 / 36 page ![]() 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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