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2-Port USB 2.0 Hub Controller
Datasheet
Revision 2.3 (08-27-07) 42 SMSC USB2502
DATASHEET
Chapter 8 AC Specifications
8.1 Oscillator/Clock
Crystal: Parallel Resonant, Fundamental Mode, 24 MHz ±100ppm.
External Clock: 50% Duty cycle
± 10%, 24 MHz ± 100ppm, Jitter < 100ps rms.
8.1.1 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 Section 5.3).
8.1.2 I2C EEPROM:
Frequency is fixed at 59KHz ± 20%.
8.1.3 USB 2.0
The 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 Specification for more information.