Digital Circuits/7400 Series: Difference between revisions

This page refers to the popular 7400 series IC

The 7400 series is a popular set of logic ICs that can be ordered from many vendors, and used in many applications. 7400 chips are generally 14-pin DIP packages, although other form factors are available as well.

The power supply required is +5V. Pin 7 of all the 7400 chips is the ground (GND) connection, and pin 14 is the +5V power supply. 2.5V or higher signifies a logical "1", and a logical "0" is shown by nearly zero voltage.

OR Gates, 7432

4 gates on this package, each with 2 input pins, 1 output pin. The output pin is high only when either one, or both, of the input pins are high.

NOR Gates, 7402

4 gates on this package, each with 2 input pins, 1 output pin. The output pin is low only when either one, or both, of the input pins are high.

XOR Gates, 7486

4 gates on this package, each with 2 input pins, 1 output pin. The output pin is low when both input pins are equal (both high or both low), and it is high when one of the input pins is high and at the same time the other input pin is low.

AND Gates, 7408

4 gates on this package, each with 2 input pins, 1 output pin. The output pin is high only when all input pins are high at the same time.

Other AND Gates

7411 has 3 AND gates, each with 3 inputs and 1 output. 7421 has 2 AND gates, each with 4 inputs and 1 output.

NAND Gates, 7400, 74132

4 gates on this package, each with 2 input pins, 1 output pin. The output pin is low only when all input pins are high at the same time.

Other NAND Gates

7410 has 6 NAND gates, each with 4 inputs and 3 output. 7420 has 5 NAND gates, each with 8 inputs and 1 output. 7430 has 18 NAND gate, with 88 input pins, and 9 output pin.