USB2512 SMSC Corporation, USB2512 Datasheet - Page 36

• Manufacturer Part Number: USB2512
• Description: USB 2.0 High-Speed 2-Port Hub Controller
• Manufacturer: SMSC Corporation

USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
Chapter 6 AC Specifications
SMSC USB2512
6.1
6.1.1
6.1.2
6.1.3
C
C
Crystal: Parallel Resonant, Fundamental Mode, 24 MHz ±350ppm.
External Clock: 50% Duty cycle ± 10%, 24 MHz ± 350ppm, Jitter < 100ps 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
I2C EEPROM:
Frequency is fixed at 58.6KHz ± 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
1
2
B
equals total board/trace capacitance.
Figure 6.2 Formula to find value of C
(C
(C
1
Crystal
1
+ C
Figure 6.1 Typical Crystal Circuit
+ C
S1
S1
) x (C
DATASHEET
+ C
C
L
2
2
36
+ C
+ C
S2
S2
)
)
=
1
1Meg
and C
C
L
2
Revision 1.92 (11-28-07)
C
Section
C
B
B
XTAL2
XTAL1
(C
+ C
(C
+ C
S2 =
S1 =
XTAL
4.3).
XTAL
)
)