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USB2412 数据表(PDF) 21 Page - SMSC Corporation |
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USB2412 数据表(HTML) 21 Page - SMSC Corporation |
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21 / 27 page ![]() 2-Port USB 2.0 Hi-Speed Hub Controller Datasheet SMSC USB2412 21 Revision 1.3 (12-27-11) DATASHEET 5.2 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 1.2 V CMOS Logic. XTALOUT should be treated as a no connect. 5.2.1 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 1. See the USB Specification for more information. |
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