Home > Components > Logic Components > NAND Gate

NAND Gate

A digital logic NAND gate that outputs LOW only when both of its inputs are HIGH.

Component Preview

NAND Gate

A fundamental digital logic gate that implements logical NAND (NOT-AND). It produces a LOW output only when all of its inputs are HIGH. If any input is LOW, the output is HIGH.

Logic ComponentsDigital Logic

Overview

The NAND Gate is a universal logic gate (meaning any other logic function can be constructed using only NAND gates). It evaluates to false (LOW) strictly when all input conditions are true (HIGH).

Pin Reference

Pin	Type	Description
IN1	input	First digital logic input. Expects HIGH (1) or LOW (0).
IN2	input	Second digital logic input. Expects HIGH (1) or LOW (0).
OUT	digital	Digital logic output. Driven LOW only when both IN1 and IN2 are HIGH.

Configurable Attributes

This component currently has no configurable attributes.

Working Principle

Truth Table

IN1	IN2	OUT
0 (LOW)	0 (LOW)	1 (HIGH)
0 (LOW)	1 (HIGH)	1 (HIGH)
1 (HIGH)	0 (LOW)	1 (HIGH)
1 (HIGH)	1 (HIGH)	0 (LOW)

The NAND Gate physically models the inverted result of Boolean multiplication: Y = (A * B)'.

Wiring Diagram

Example Arduino Code

const int pinIn1 = 2; // Connect to IN1
const int pinIn2 = 3; // Connect to IN2
const int pinOut = 4; // Connect to OUT

void setup() {
  Serial.begin(9600);
  pinMode(pinIn1, OUTPUT);
  pinMode(pinIn2, OUTPUT);
  pinMode(pinOut, INPUT);
  Serial.println("NAND Gate Truth Table Test:");
}

void loop() {
  for (int state = 0; state < 4; state++) {
    bool val1 = (state & 1);
    bool val2 = (state & 2) >> 1;

    digitalWrite(pinIn1, val1 ? HIGH : LOW);
    digitalWrite(pinIn2, val2 ? HIGH : LOW);
    delay(10);
    
    int result = digitalRead(pinOut);
    
    Serial.print("IN1: ");
    Serial.print(val1);
    Serial.print(" | IN2: ");
    Serial.print(val2);
    Serial.print(" => OUT: ");
    Serial.println(result);
    delay(1000);
  }
}

Simulation Notes

• Evaluates logic instantaneously.
• Floating inputs may cause undefined behavior. Tie unused inputs to Ground.

Notes / Warnings

• Voltage Levels: The simulator treats standard logic signals as valid inputs. Do not apply analog voltages.

---

← Previous: 2-to-1 Multiplexer

Next: NOR Gate →