Ultra Fast USB 2.0
Datasheet
Chapter 8 AC Specifications
8.1Oscillator/Clock
Crystal: Parallel Resonant, Fundamental Mode, 24 MHz ± 100ppm.
External Clock: 50% Duty cycle ± 10%, 24/48 MHz ± 100ppm, Jitter < 100ps rms.
XTAL1
(CS1 =
CB + CXTAL )
C1
Crystal CL | 1Meg |
C2 | XTAL2 |
| |
| (CS2 = |
| CB + CXTAL ) |
Figure 8.1 Typical Crystal Circuit
Note: CB equals total board/trace capacitance.
(C1 + CS1) x (C2 + CS2)
= CL
(C1 + CS1 + C2 + CS2)
Figure 8.2 Formula to Find Value of C1 and C2
SMSC USB2250/50i/51/51i | 33 | Revision 1.1 |
DATASHEET