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Input signal from the mechanical keys. If you know the input characteristics of the driven logic circuit, it is pretty easy to manage digital inputs from switches, keyboard, Comparators, etc. it is easiest here to use a resistor connected to the power bus (Fig. 19.6 a). When working with elements of the TTL, taking into account their input characteristics, is better when the resistor is switched to ground. In this case, the key gives good dissipation current at low level input, and the resistor provides the high-level voltage of +5 V, creating a high noise immunity. In addition, it is convenient to have the reset circuit to ground through the key.