The document discusses a 4-bit adder subtractor, explaining its components, functionality, and circuit diagram for adding and subtracting binary numbers. It includes descriptions of inputs, outputs, logic gates, and control signals used in the adder and the process for subtraction using a quadruple XOR gate. Additionally, a link to a 3D model on Tinkercad is provided for further understanding.

1. 4-Bit Adder
Subtractor

2. INTRODUCTION:
Abdul Rehman Ansari
Roll no # 241585
Ali Akbar
Roll no #241481
Haider Mustafa
Roll no # 242380

3. WHAT IS 4-BIT ADDER AND SUBTRACTOR :
This adds two
binary numbers also
it can subtract a
number from the
other.
In this system a
group of four LEDs
represent 1st
input
and an other group
represents 2nd
input.
The third group of
LEDs shows the
result of the
calculation

4. COMPONENTS:
• Bread boards
• Power supply of 5V
• Jumper wires
• Resisters
• LEDs
• Dip switches
• 4-bit adder
• Quadruple XOR

5. NAMES OF THE PINS OF XOR AND 4-BIT ADDER

6. 4-BIT ADDER:
Logical symbol:

7. FUNCTION TABLE Click icon to add picture
•Inputs: Columns labeled A1, B1, A2, and B2 represent
the binary input combinations (L for Low or logic 0, H for
High or logic 1).
•Control Signals (CO): CO indicates the state of a
control input (L or H).
•Outputs: Σ1, Σ2, C2, and others describe the output
behavior under different input and control signal
conditions.

8. •Inputs: The inputs are labeled A1, B1, A2, B2,
A3, B3, A4, and B4, with CO as a control signal.
Each input goes through logical operations.
•Logic Gates: In this diagram uses basic gates
(AND, OR, NOT) to process inputs, combining
them into intermediate signals and final outputs.
Positive logic means that a High (H) represents
logic 1 and a Low (L) represents logic 0.
•Outputs: The outputs are labeled Σ1, Σ2, Σ3, Σ4
(likely representing sum outputs) and C4 (likely a
carry output).

9. QUADRUPLE XOR
Input :
It take two inputs per XOR
gate . So, total it requires 8
inputs
Process:
Each XOR processes
inputs by comparing
their logics
Output :
It gives high
output when
inputs differ and
low when they
match

10. SUBTRACTOR
• Subtracting two binary
numbers using quadruple
XOR gate.
• First we will calculate 2’s
compliment of the number
we have to subtract, and
then add both using 4-bit
adder.

11. This is the
logical
diagram of
4-bit adder
subtractor

12. This is the
circuit
diagram of
4-bit adder
subtractor

13. TINKERCAD 3D MODEL
• https://www.tinkercad.com/things/3ZiugKDvyHb
• This can help us to understand properly.

14. THANK YOU