EVB-USB2412 SMSC, EVB-USB2412 Datasheet - Page 21

• Manufacturer Part Number: EVB-USB2412
• Description: EVALUATION BOARD FOR USB2412
• Manufacturer: SMSC

Specifications of EVB-USB2412

• Design Resources: EVB-USB2412 Schematic EVB-USB2412 BOM
• Main Purpose: Interface, USB 2.0 Hub
• Embedded: No
• Utilized Ic / Part: USB2421
• Primary Attributes: Dual Port Hub, High Speed (480Mbps)
• Secondary Attributes: Single 5V Supply
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1106

2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
Chapter 6 AC Specifications
SMSC USB2412
6.1
C
C
C
C
C
C
C
SYMBOL
0
L
B
S
XTAL
1
2
C
C
Parallel Resonant, Fundamental Mode, 24 MHz ±350 ppm.
Note 6.1
Note 6.2
Oscillator/Crystal
2
1
Crystal shunt capacitance
Crystal load capacitance
Total board or trace
capacitance
Stray capacitance
XTAL pin input capacitance
Load capacitors installed on
OEM board
C
0
C
and should be set to ‘0’ for use in the calculation of the capacitance formulas in
"Formula to Find the Value of C1 and
parasitic capacitance between XTALIN and XTALOUT. For an accurate calculation of C
and C
Each of these capacitance values is typically approximately 18 pF.
0
DESCRIPTION
is usually included (subtracted by the crystal manufacturer) in the specification for C
Figure 6.2 Formula to Find the Value of C
2,
Crystal
take the parasitic capacitance between traces XTALIN and XTALOUT into account.
Figure 6.1 Typical Crystal Circuit
Table 6.1 Crystal Circuit Legend
C
C
C
1
2
L
= 2 x (C
= 2 x (C
DATASHEET
Crystal manufacturer’s specification (See
OEM board design
SMSC IC and OEM board design
SMSC IC
Calculated values based on
Find the Value of C1 and C2"
21
L
L
1 M
– C
– C
C2". However, the OEM PCB itself may present a
0
0
IN ACCORDANCE WITH
) – C
) – C
XTAL2
(C
XTAL1
(C
S1
S2
1
and C
S2 =
S1 =
C
C
Figure 6.2, "Formula to
2
B2
(See
B1
+ C
+ C
Note
XTAL1
XTAL2
6.2)
Revision 1.0 (02-12-10)
Note
)
)
6.1)
Figure 6.2,
L
1