SMSC USB4640i Manuel d'utilisateur télécharger pdf (Page 55)

High Speed Inter-Chip USB 2.0 Hub and Flash Media Controller

Datasheet

SMSC USB4640/USB4640i 55 Revision 1.0 (06-01-09)

DATASHEET

9.2 Ceramic Resonator

24 MHz ± 350 ppm

Figure 9.3 Ceramic Resonator Usage with SMSC IC

9.3 External Clock

50% Duty cycle ± 10%, 24 MHz ± 350 ppm, Jitter < 100 ps rms.

The external clock is recommended to conform to the signaling level designated in the JESD76-2

specification on 1.8 V CMOS Logic. XTAL2 should be treated as a no connect.

9.3.1 I

C EEPROM

Frequency is fixed at 58.6 kHz ± 20%

9.3.2 USB 2.0

The SMSC device 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.

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SMSC USB4640i Manuel d'utilisateur Page 55