74LS00 NAND Gate as Inverter | Microautomation.no

Introduction

The 74LS00 is a quad 2-input NAND gate IC, meaning it contains four NAND gates, each with two inputs. A NAND gate can be used as an inverter by connecting both inputs together, making the gate behave like a NOT gate. This experiment demonstrates how to configure the 74LS00 to function as an inverter.

Objective

The objective of this experiment is to use the 74LS00 NAND gate as an inverter to invert the input signal, demonstrating its logic operation when both inputs are tied together.

Components Needed

1 x 74LS00 NAND Gate IC
1 x SPST Switch (or any input source)
1 x LED (for output indication)
1 x Resistor (220Ω for LED)
1 x Resistor (10kΩ for pull-down resistor)
1 x Breadboard
Connecting Wires
Power Supply (5V)

Circuit Diagram

Procedure

Place the 74LS00 IC on the breadboard.
Connect pin 14 (VCC) of the 74LS00 to the 5V power supply, and pin 7 (GND) to ground.
Choose one of the NAND gates in the 74LS00 (e.g., gate 1 with inputs at pin 1 and pin 2, output at pin 3).
Connect both inputs (pin 1 and pin 2) of the chosen NAND gate together.
Connect a pull-down resistor (10kΩ) between the inputs (pin 1 and pin 2) and ground to ensure a defined low state when the input is not active.
Connect a switch or input signal to the tied inputs (pin 1 and pin 2).
Connect the output (pin 3) of the NAND gate to the anode of the LED. The cathode of the LED should be connected to ground through a 220Ω current-limiting resistor.
Power the circuit, and toggle the switch or input signal. When the input is HIGH (logic 1), the output will be LOW (logic 0), turning the LED off. When the input is LOW (logic 0), the output will be HIGH (logic 1), turning the LED on, demonstrating the inverting action.

No Ads Available.

Results

When the input to the NAND gate is HIGH (both inputs tied together), the output becomes LOW, and when the input is LOW, the output becomes HIGH. This shows that the 74LS00 NAND gate can be used as an inverter when both inputs are tied together.

Conclusion

This experiment demonstrated that the 74LS00 NAND gate can function as an inverter by tying its inputs together. The output of the gate behaves like a NOT gate, inverting the input signal. This application of the NAND gate showcases its versatility in basic digital logic circuits.