USB2640I Standard Microsystems Corp., USB2640I Datasheet - Page 58
USB2640I
Manufacturer Part Number
USB2640I
Description
Industrial Temperature Usb 2.0 Flash Media Controller And Usb Hub Combo
Manufacturer
Standard Microsystems Corp.
Datasheet
1.USB2640I.pdf
(60 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
USB2640I-HZH-02
Manufacturer:
SMSC
Quantity:
20 000
Chapter 10 AC Specifications
Revision 2.0 (10-03-08)
10.1
Crystal: Parallel Resonant, Fundamental Mode, 24 MHz ± 100 ppm.
External Clock: 50% Duty cycle ± 10%, 24 MHz ± 100 ppm, Jitter < 100 ps rms.
Note: C
Oscillator/Clock
C
C
B
1
2
equals total board/trace capacitance.
Figure 10.2 Formula to find value of C
Figure 10.1 Typical Crystal Circuit
Crystal
C
L
=
Industrial Temperature USB 2.0 Flash Media Controller and USB Hub Combo
DATASHEET
C
(C
L
(C
1
1
+ C
+ C
58
S1
S1
) x (C
+ C
1Meg
2
2
+ C
+ C
S2
S2
)
)
1
and C
C
C
B
B
XTAL2
XTAL1
(C
+ C
(C
+ C
21
S2 =
S1 =
XTAL
XTAL
)
)
SMSC USB2640i/USB2641i