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How many NAND circuits are contained in a 7400 NAND IC?

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How many NAND circuits are contained in a 7400 NAND IC?

(a) 1

(b) 2

(c) 4

(d) 8

The question was posed to me during an interview.

Query is from Logic Gates and Networks topic in portion Boolean Algebra and Minimization Techniques and Logic Gates of Digital Circuits

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Right option is (c) 4

Explanation: 7400 IC’s pin has total 14 pin. Pin no 7 use for GND and pin no 14 used for +vcc and remaining pins used for connections. For a NAND gate two inputs are required and one output is obtained means for NAND gate 3 pin connections are required. Thus, a 7400IC contains 4 NAND gates with each having 3 pins. Therefore, total 12 pins dedicated for the NAND operation. Rest 2 pins for power supply.

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