Question: 1- Why USB Impedance is 90 Ohms 2- USB is a synchronous or Asynchronous communications
S Thread Starter sgr Joined Jun 27, 2017 34 Jan 2, 2025 #1 Question: 1- Why USB Impedance is 90 Ohms 2- USB is a synchronous or Asynchronous communications
panic mode Joined Oct 10, 2011 4,947 Jan 2, 2025 #2 1. where did you get this value and why does it matter? 2. that is not a question
BobTPH Joined Jun 5, 2013 11,488 Jan 2, 2025 #3 1. Because that is what the designers of it decided. 2. Asynchronous.
crutschow Joined Mar 14, 2008 38,423 Jan 2, 2025 #4 1. That's the approximate transmission-line impedance of a twisted-wire pair, which is used in USB cables.
1. That's the approximate transmission-line impedance of a twisted-wire pair, which is used in USB cables.
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