Texas Instruments’ 5400 and 7400 TTL quad 2-input NAND gate has been in continuous production since 1964 and is the progenitor of what is probably the most numerous breed of integrated circuits ...

Similarly, when a high voltage (15V) is applied at the gate terminal, the MOSFET operates in the saturated mode, and a low impedance is present between the drain and source terminals of the MOSFET.

The NAND gate is a circuit that outputs '0' when both inputs are '1', and '0' otherwise, so if you arrange the NAND gate as follows, the Invert circuit is completed.

Therefore, by forcing input C to a logic high (Q3 opened and Q5 closed), you can use A as input 1 and B as input 2 in a NOR gate arrangement. Thus, this combination gate can perform both NAND and ...