The 7447 is a quad two-input positive-NAND gate. It is a member of the 7400 series of logic ICs. The 7447 is available in both through-hole and surface-mount packages. The 7447 has four independent NAND gates, each with two inputs and one output. The inputs of each NAND gate are labeled A and B, and the output is labeled Y. The truth table for the 7447 is shown below. | A | B | Y | |---|---|---| | 0 | 0 | 1 | | 0 | 1 | 1 | | 1 | 0 | 1 | | 1 | 1 | 0 | The 7447 can be used to perform a variety of logic functions, such as AND, OR, XOR, and NOT. For example, the following circuit can be used to create a two-input AND gate: ``` A B Y 0 0 0 0 1 0 1 0 0 1 1 1 ``` The 7447 can also be used to create more complex logic circuits, such as flip-flops and counters. Here is a more detailed explanation of how the 7447 works. Each NAND gate in the 7447 is made up of four transistors. The two inputs of the NAND gate are connected to the bases of two transistors, and the output of the NAND gate is connected to the collector of the third transistor. The fourth transistor is used as a pull-up resistor. When both inputs of the NAND gate are low, the transistors Q1 and Q2 are turned on. This causes the collector of Q3 to be pulled low, which in turn turns off the transistor Q4. This results in a high output on the Y pin of the NAND gate. When either input of the NAND gate is high, the transistor Q1 or Q2 is turned off. This causes the collector of Q3 to be pulled high, which in turn turns on the transistor Q4. This results in a low output on the Y pin of the NAND gate. The 7447 is a versatile and useful logic gate that can be used to create a variety of logic circuits. It is available in a variety of packages, making it suitable for use in a wide range of applications.

### Applications

The 7447 can be used in a variety of applications, including: * Digital logic circuits * Arithmetic circuits * Control circuits * Data processing circuits * Communication circuits * Industrial control circuits * Test equipment### Wiring Diagram

The following is a wiring diagram for the 7447: ``` +5V /---|/ / | \ / | \ | A1 | B1 | |-------|-------| | A2 | B2 | |-------|-------| | A3 | B3 | |-------|-------| | A4 | B4 | \ | / \---|/ GND ```### Pinout

The following is the pinout for the 7447: | Pin | Label | Function | |---|---|---| | 1 | 1A | Input A1 | | 2 | 2A | Input B1 | | 3 | 3Y | Output Y1 | | 4 | GND | Ground | | 5 | 1B | Input A2 | | 6 | 2B | Input B2 | | 7 | 3Y | Output Y2 | | 8 | 1C | Input A3 | | 9 | 2C | Input B3 | | 10 | 3Y | Output Y3 | | 11 | 1D | Input A4 | | 12 | 2D | Input B4 | | 13 | 3Y | Output Y4 | | 14 | VCC | Power |### References

* [7447 datasheet](https://www.ti.com/lit/ds/symlink/sn7447.pdf) * [7447 tutorial](https://www.electronics-tutorials.ws/logic/logic_gates/7447.html) * [7447 application notes](https://www.sparkfun.com/Pic16f84 00 99 Forward Backward Counter Circuit Picbasic Pro Electronics Projects Circuits

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