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They raised max USB output voltage from 5.25V to 5.50V. Retroactively.
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amyk:

--- Quote from: SiliconWizard on November 03, 2023, 09:27:42 pm ---
--- Quote from: magic on November 02, 2023, 06:03:21 pm ---I'm pretty sure the original spec was simply copied from ATX, which is 5V ±5%.

--- End quote ---

Yes, that's likely.

--- End quote ---
...and that spec itself came from 5V TTL logic.
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