USB2250 SMSC Corporation, USB2250 Datasheet - Page 34

• Manufacturer Part Number: USB2250
• Description: Ultra Fast USB 2.0 Multi-Format Flash Media Controller
• Manufacturer: SMSC Corporation

Chapter 8 AC Specifications
Revision 2.6 (05-08-08)
8.1
C
C
1
2
Crystal: Parallel Resonant, Fundamental Mode, 24 MHz ± 100ppm.
External Clock: 50% Duty cycle ± 10%, 24/48 MHz ± 100ppm, Jitter < 100ps rms.
Note: C
Oscillator/Clock
B
equals total board/trace capacitance.
Figure 8.2 Formula to Find Value of C
Crystal
(C
(C
Figure 8.1 Typical Crystal Circuit
1
1
+ C
+ C
S1
DATASHEET
C
S1
) x (C
L
+ C
34
2
2
+ C
+ C
Ultra Fast USB 2.0 Multi-Format Flash Media Controller
S2
S2
)
)
1Meg
1
and C
=
2
C
L
C
C
SMSC USB2250/51/59
B
B
XTAL2
XTAL1
(C
+ C
(C
+ C
S2 =
S1 =
XTAL
XTAL
Datasheet
)
)