USB2512A Standard Microsystems Corp., USB2512A Datasheet - Page 36

• Manufacturer Part Number: USB2512A
• Description: Usb2512a Usb 2.0 High-speed 2-port Hub Controller
• Manufacturer: Standard Microsystems Corp.

Chapter 6 AC Specifications
Revision 1.96 (07-11-08)
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
I
Clock frequency is fixed at 60KHz ± 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
2
C EEPROM:
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
USB 2.0 Hi-Speed 2-Port Hub Controller
2
C
Section
C
B
B
XTAL2
XTAL1
(C
+ C
(C
+ C
SMSC USB2512A
S2 =
S1 =
XTAL
4.3).
XTAL
Datasheet
)
)