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The 74xx series of integrated circuits use 5 volts. This is common in TTL (Transistor to Transistor Logic) circuits.
For inputs:
The 0 or Low Logic level is anything less than 0.8v
The 1 or High logic level is anything from 2v up to the supply or 5v level.
Voltages between these trigger points in the logic, should be avoided to prevent spurios operation.
The output levels are generally
5v = logic level 1 or High
0v = logic level 0 or Low.

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