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  1. As it's for driving WS2812x I'd expect Vcc=5V and...

    As it's for driving WS2812x I'd expect Vcc=5V and therefore it doesn't make a sense to use AHC version as it has pretty much the same input levels (CMOS) as WS2812

    For the AHC version, that 3.3V...
  2. AHCT - Advanced High speed Cmos - TTL switching...

    AHCT - Advanced High speed Cmos - TTL switching levels compatible inputs.

    TTL logic levels are: Log. 0 is between 0V to 0.8V and Log 1 is between 2V to 5V. So there is no problem with 3V3 CMOS...
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