4 Bit Adder

The Adder is a digital circuit that adds two 4-bit numbers.
Logically, it is built from four Half Adders. It has 8 inputs (4 bits for each number) and 5 outputs (4 sum bits and 1 carry bit). The carry signal represents an overflow into the next digit in a multi-digit addition.

Implementation

For the implementation, Binary Full Adder CD74HC283E was used.

The video demonstrates the circuit behavior for all input states.