EVB-USB2514QFN48 SMSC, EVB-USB2514QFN48 Datasheet - Page 69

• Manufacturer Part Number: EVB-USB2514QFN48
• Description: BOARD EVAL FOR USB2514 48-QFN
• Manufacturer: SMSC

Specifications of EVB-USB2514QFN48

• Main Purpose: Interface, USB 2.0 Hub
• Embedded: No
• Utilized Ic / Part: USB2514, USB2514I
• Primary Attributes: Quad Port Hub, High Speed (480Mbps), I2C/SMBus
• Secondary Attributes: Overcurrent Protection, Port Power Switching, ESD Protection
• Interface Type: USB
• Product: Interface Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: USB2514
• Other names: EVB-USB2514GFN48; Q4128965

USB 2.0 Hi-Speed Hub Controller
Datasheet
Chapter 10 AC Specifications
SMSC USB251x
10.1
1.Only when SEL48 is available and supported.
C
C
C
C
C
C
C
SYMBOL
0
L
B
S
XTAL
1
2
C
C
Crystal: Parallel Resonant, Fundamental Mode, 24/48
External Clock: 50% Duty cycle ± 10%, 24/48 MHz ± 350 ppm, Jitter < 100 ps rms.
Note 10.1 C
Note 10.2 Each of these capacitance values is typically approximately 18 pF.
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
and should be set to ‘0’ for use in the calculation of the capacitance formulas in
Figure 10.2, "Formula to Find the Value of C1 and
present a parasitic capacitance between XTALIN and XTALOUT. For an accurate
calculation of C
XTALOUT into account.
0
0
DESCRIPTION
is usually included (subtracted by the crystal manufacturer) in the specification for C
Figure 10.2 Formula to Find the Value of C
Crystal
Figure 10.1 Typical Crystal Circuit
C
Table 10.1 Crystal Circuit Legend
C
1
1
2
= 2 x (C
and C
= 2 x (C
C
L
2
DATASHEET
, take the parasitic capacitance between traces XTALIN and
Crystal manufacturer’s specification (See
OEM board design
SMSC IC and OEM board design
SMSC IC
Calculated values based on
to Find the Value of C1 and C2"
69
L
L
– C
– C
1 M
0
0
) – C
) – C
IN ACCORDANCE WITH
1
MHz ±350 ppm.
S1
S2
1
C2". However, the OEM PCB itself may
XTAL1
(C
XTAL2
(C
and C
S1 =
S2 =
Figure 10.2, "Formula
2
C
C
(See
B2
B1
+ C
+ C
Note
Note
Revision 1.1 (04-26-10)
XTAL2
XTAL1
10.2)
10.1)
)
)
L