USB2517 Standard Microsystems Corp., USB2517 Datasheet - Page 66

• Manufacturer Part Number: USB2517
• Description: Usb 2.0 Hi-speed Hub Controller
• Manufacturer: Standard Microsystems Corp.

Chapter 10 AC Specifications
Revision 1.0 (3-11-09)
10.1
10.1.1
10.1.2
10.1.3
1.Only when SEL48 is available and supported.
C
Crystal: Parallel Resonant, Fundamental Mode, 24/48
External Clock: 50% Duty cycle ± 10%, 24/48 MHz ± 350 ppm, Jitter < 100 ps rms.
Note: C
SMBus Interface:
The SMSC Hub conforms to all voltage, power, and timing characteristics and specifications as set
forth in the SMBus 1.0 specification for Slave-Only devices (except as noted in
I
Clock frequency is fixed at 60 KHz ± 20%.
USB 2.0
The SMSC Hub conforms to all voltage, power, and timing characteristics and specifications as set
forth in the USB 2.0 specification. Please refer to the USB 2.0 specification for more information.
Oscillator/Clock
C
2
2
C EEPROM:
1
B
equals total board/trace capacitance.
Figure 10.3 Simplified Form of the Capacitance Formula
Figure 10.2 Formula to Find the Value of C
C
Crystal
L
=
Figure 10.1 Typical Crystal Circuit
(C
C
(C
C = (2 x C
L
1
1
DATASHEET
+ C
+ C
66
S1
S1
) x (C
+ C
1 Meg
L
) - C
1
2
MHz ±350 ppm.
2
+ C
+ C
s
1
S2
S2
and C
)
XTAL2
(C
XTAL1
(C
)
S1 =
S2 =
2
USB 2.0 Hi-Speed Hub Controller
C
C
B
B
+ C
+ C
Section
XTAL
XTAL
SMSC USB251x
8.3).
)
)
Datasheet