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USB voltage supply for full/high-speed

Question asked by Mikkel Bjerring on Mar 7, 2019
Latest reply on Apr 29, 2019 by xiangjun.rong

I have been going over the documentation for the LPC546xx and have a question about the Vdd needed for USB 

this is on page 87 in the datasheet 


It is mention that you need a higher voltage to use USB full-speed than the USB high-speed 

any input to why this is the case ?