Ultra Fast USB 2.0 Multi-Format Flash Media Controller
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.
XTAL1
(CS1 =
CB + CXTAL
)
C1
1Meg
Crystal
CL
C2
XTAL2
(CS2 =
CB + CXTAL
)
Figure 8.1 Typical Crystal Circuit
Note: CB equals total board/trace capacitance.
(C1 + CS1) x (C2 + CS2)
(C1 + CS1 + C2 + CS2)
CL
=
Figure 8.2 Formula to Find Value of C1 and C2
Revision 2.6 (05-08-08)
SMSC USB2240/USB2241
DATA2S6HEET