A pretty big one, actually. 480mhz, so at least 15cm
How much of an unterminated stub do you think I can get away with on a USB2 diffpair without killing signal integrity? Wavelength should be ~80cm so... 1cm ought to be fine? Context: a design with a USB2 hub but 0R links to reconfigure to bypass it. Not sure if I need 2 sets.
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I’ve gotten away with at least 1.5cm
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I've had like 3-4cm in the past work just fine (e.g. bringing traces to multiple ports for analysis) without much signal loss. (I've seen others' designs go as high as 8cm and things have still Worked (TM) okay.)
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Sparkfun used to sell a 3-way splitter cable from single USB-A to mini-B, micro-B, and I think the last one was full-B, and each was several inches long, and it still worked. I'm sure it was awful, and I never heavily tested it, but it DID work.
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Jesus.
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