One of the nicest logic families ever – HC (and HCT) CMOS – has the marvellous characteristic that someone thought about interfacing its inputs with voltages higher than Vdd early – and created a really nice input protection structure. What is good, is that, by design rather than luck, up to +20mA can be pushed ...
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from Electronics Weekly https://www.electronicsweekly.com/blogs/engineer-in-wonderland/interfacing-avrs-arduinos-voltages-higher-vcc-2018-04/
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