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usb transceiver capacitance load select..

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hi guys, i have to choose the appropriate capacitance load for Full-speed driver to run simulation.
according to page 130 of USB Specification Rev2.0, it is 50pF; however, when i found the input capacitance of downstream facing FS-Receiver of 150pF on page 142, then i'm confused which one should be used?
I'm wondering if some one with relative experience could give me some advice,thanks a lot!
 

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