The SN74HC86N is a logic IC that contains four independent 2-input Exclusive OR (XOR) gates. This integrated circuit is designed by Texas Instruments (TI) and is commonly used in digital circuits for performing the XOR logical operation. The XOR gate is a digital logic gate that outputs true or high only when the inputs to the gate are different.
This circuit uses a 74HC595 shift register to control multiple LEDs via a common ground configuration, with a microcontroller providing serial data input. It includes decoupling capacitors for stability and a 12-Bit DAC, potentially for analog signal generation or reference voltage application.
Open Project in Cirkit Designer
This circuit uses a Teensy 4.0 microcontroller to control a MAX7219 LED driver, which in turn drives three 7-segment displays. The microcontroller runs code to display numbers from 0 to 999 on the 7-segment displays, with the SN74AHCT125N buffer providing signal integrity and the necessary capacitors and resistors ensuring stable operation.
Open Project in Cirkit Designer
This circuit is a logic-based control system using multiple 74HC00 quad NAND gate integrated circuits to perform complex logic operations. The output of these operations is visualized through two LEDs, each with a current-limiting resistor, powered by a 9V battery. The circuit is likely designed for educational or demonstration purposes to show how NAND gates can be used to create various logic functions and control outputs.
Open Project in Cirkit Designer
This circuit is a simple logic-based control system utilizing a SN74LS00N NAND gate IC, a pushbutton, and passive components like resistors, a capacitor, a diode, and an LED. The pushbutton controls the logic inputs to the NAND gates, which in turn drive the LED, indicating the output state of the logic circuit.
Open Project in Cirkit Designer| Pin Number | Name | Description |
|---|---|---|
| 1 | 1A | Input A for Gate 1 |
| 2 | 1B | Input B for Gate 1 |
| 3 | 1Y | Output for Gate 1 |
| 4 | 2Y | Output for Gate 2 |
| 5 | 2A | Input A for Gate 2 |
| 6 | 2B | Input B for Gate 2 |
| 7 | GND | Ground (0 V) |
| 8 | 3B | Input B for Gate 3 |
| 9 | 3A | Input A for Gate 3 |
| 10 | 3Y | Output for Gate 3 |
| 11 | 4Y | Output for Gate 4 |
| 12 | 4A | Input A for Gate 4 |
| 13 | 4B | Input B for Gate 4 |
| 14 | Vcc | Positive Supply Voltage |
Q: Can I use the SN74HC86N at a supply voltage lower than 2 V? A: No, the IC may not function properly below the minimum specified supply voltage.
Q: What happens if I leave an input pin unconnected? A: An unconnected or floating input can pick up noise and cause unpredictable output. Always tie unused inputs to a defined logic level.
Q: Can I connect the outputs of two gates together? A: No, you should not directly connect the outputs of two gates as it can lead to contention and damage the IC.
The following example demonstrates how to use the SN74HC86N with an Arduino UNO to perform an XOR operation on two digital inputs and display the result on an LED.
// Define the input and output pins
const int inputPinA = 2; // Connect to 1A of SN74HC86N
const int inputPinB = 3; // Connect to 1B of SN74HC86N
const int outputPin = 13; // Connect to 1Y of SN74HC86N
void setup() {
// Set the input and output pin modes
pinMode(inputPinA, INPUT);
pinMode(inputPinB, INPUT);
pinMode(outputPin, OUTPUT);
}
void loop() {
// Read the state of the inputs
int stateA = digitalRead(inputPinA);
int stateB = digitalRead(inputPinB);
// Perform the XOR operation using the digital inputs
int xorResult = stateA ^ stateB;
// Write the result to the output pin
digitalWrite(outputPin, xorResult);
// Delay for a short period to debounce the inputs
delay(50);
}
Remember to connect the Arduino's GND to the SN74HC86N's GND pin, and the 5V pin to the Vcc pin of the SN74HC86N. The inputs (1A and 1B) should be connected to the Arduino's digital pins 2 and 3, respectively, and the output (1Y) to the digital pin 13 or any other digital pin you choose to use as an output.