The 74LS86 IC

What is it?

This IC is a quad two-input exclusive OR gates (XOR Gates) IC, which resembles 4 XOR gates inside. This IC works at a voltage of 5V. It has a total of 14 pins, 8 pins for input, 4 pins for output, and 2 pins for voltage. Pin 1, 2, 4, 5, 9, 10, 12, and 13 are inputs, pin 3, 6, 8, and 11 are outputs, pin 7 and 14 are connected to voltage supply. Below is the position of XOR Gates inside the IC:

Arrangement of XOR Gates inside IC 74LS86

About XOR Gate

Exclusive OR Gate, or XOR Gate, is a logic gate that register output HIGH when one of the 2 inputs are DIFFERENT, and register LOW when both inputs are the SAME. Below is the symbol of XOR gate, its Boolean expression & its truth table:

Symbol, Boolean expression & truth table for XOR Gate

This is the circuit for an XOR gate. We can assume that this circuit exist inside the IC. It shows the connection of pin-1, pin-2, pin-3, pin-7 & pin-14. It is said to have 4 similar circuits inside the IC(because it has 4 XOR Gate). Pin-1 and pin-2 are input, pin-3 is output, pin-7 and pin-14 are connected to voltage supply (all 4 XOR gates share the same voltage pins).

Circuit of XOR Gate