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USB4604 数据表(PDF) 68 Page - SMSC Corporation |
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USB4604 数据表(HTML) 68 Page - SMSC Corporation |
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68 / 71 page ![]() USB 2.0 HSIC Hi-Speed 4-Port Hub Controller Datasheet Revision 1.0 (06-17-13) 68 SMSC USB4604 DATASHEET 9.6.2 External Reference Clock (REFCLK) The following input clock specifications are suggested: 50% duty cycle ± 10% 24 MHz ± 350 PPM Note: The external clock is recommended to conform to the signalling levels designated in the JEDEC specification on 1.2V CMOS Logic. XTAL2 should be treated as a no connect when an external clock is supplied. |
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