Name:

Digital Electronics Lab Record Sheets

July- November 2017

ExperimentNo: 1.a

FAMILIARISATION OF LOGIC GATES

AIM:- To study and verify the truth table of logic gates

COMPONENTS REQUIRED: -

All basic gates

PROCEDURE:-

1. Place the IC on IC Trainer Kit.

2. Connect VCC and ground to respective pins of IC Trainer Kit.

3. Connect the inputs to the input switches provided in the IC Trainer Kit.

4. Connect the outputs to the switches of O/P LEDs,

5. Apply various combinations of inputs according to the truth table and observe
condition of LEDs.

Inverter Gate (NOT Gate) 7404LS

A O/P
0
1

Date of Experiment| Faculty Signature|Vani Devi/Smrithi Lakshmi / Gibi K Thomas/Sasikala EC|SOE|CUSAT

 Name:
Digital Electronics Lab Record Sheets
July- November 2017

2-Input AND Gate7408LS

A B O/P
0 0
0 1
1 0
1 1

2-Input OR Gate 7432LS

A B O/P
0 0
0 1
1 0
1 1

2-Input NAND GATE 7400LS

A B O/P
0 0
0 1
1 0
1 1

Date of Experiment| Faculty Signature|Vani Devi/Smrithi Lakshmi / Gibi K Thomas/Sasikala EC|SOE|CUSAT

 Name:
Digital Electronics Lab Record Sheets
July- November 2017

2-Input NOR Gate7402LS

A B O/P
0 0
0 1
1 0
1 1

2-Input EX-OR Gate7486LS

A B O/P
0 0
0 1
1 0
1 1

3-Input NAND/ANDGate 7410/7411LS

A B C O/P
0 0 0
0 1 1
1 0 0
1 1 1

RESULT:

Studied and verified the truth table of the basic gates.

Date of Experiment| Faculty Signature|Vani Devi/Smrithi Lakshmi / Gibi K Thomas/Sasikala EC|SOE|CUSAT

 Name:
Digital Electronics Lab Record Sheets
July- November 2017

Experiment no: 1.b

NAND/NOR AS UNIVERSAL GATE

AIM :

Implementing function using only NAND Gate /NOR Gate

COMPONENTS REQUIRED:

IC 7400 /7402- 1 No.

XOR GATE USING NAND GATE

XNOR USING NOR GATE

Draw the truth table here for each case:

RESULT:

Truth table of XNOR& XOR implemented using Universal gates were verified.

Date of Experiment| Faculty Signature|Vani Devi/Smrithi Lakshmi / Gibi K Thomas/Sasikala EC|SOE|CUSAT

 Name:
Digital Electronics Lab Record Sheets
July- November 2017

Class work on ________________

(Report the special experiment/class work discussed in lab with its circuit diagram and its observation and inference)

Date of Experiment| Faculty Signature|Vani Devi/Smrithi Lakshmi / Gibi K Thomas/Sasikala EC|SOE|CUSAT

 Name:
Digital Electronics Lab Record Sheets
July- November 2017

ExperimentNo:3

HALF/FULL ADDER & HALF/FULL SUBTRACTOR

AIM:-To realize half/full adder and half/full subtractor.

i. Using X-OR and basicgates

ii .Using only NAND ( 2 i/p) gates.

COMPONENTS REQUIRED: -

IC7486,7432,7408, 7400, 7404 etc.

PROCEDURE:-

1. Verify the gates.

2. Make the connections as per the circuit diagram

3. Switch onVCC and apply various combinations of input according to the truth table.

4. Note down the output readings for half/full adder and half/full subtractor
sum/difference and the carry/borrow bit for different combinations of inputs.

Half Adder using basic gates:-

Full Adder using basic gates:-

Date of Experiment| Faculty Signature|Vani Devi/Smrithi Lakshmi / Gibi K Thomas/Sasikala EC|SOE|CUSAT

 Name:
Digital Electronics Lab Record Sheets
July- November 2017

Truth table of the Adders:

Half Adder Full Adder

A B S C
A B Cn-1 S C
0 0 0 0 0
0 0 1
0 1
0 1 0
1 0 0 1 1
1 1 1 0 0
1 0 1
1 1 0
Half Adder using NAND gates only: 1 1 1

-
Full Adder using NAND gates only:-

C n-1

Derive the expressions for Sum and Carry by applying Boolean theorems:

Date of Experiment| Faculty Signature|Vani Devi/Smrithi Lakshmi / Gibi K Thomas/Sasikala EC|SOE|CUSAT

 Name:
Digital Electronics Lab Record Sheets
July- November 2017

Using XOR and Basic Gates

(a)Half Subtractor (Draw the logic diagram here)

FullSubtractor

Borrow in ( C)
(C)(

Draw the Truth Table of the Subtractors:

(ii) Using only NAND gates

(a) Half subtractor

Borrow out

Date of Experiment| Faculty Signature|Vani Devi/Smrithi Lakshmi / Gibi K Thomas/Sasikala EC|SOE|CUSAT

 Name:
Digital Electronics Lab Record Sheets
July- November 2017

(b)FullSubtractor

Borrow
Borrow in out

Derive the expressions for Borrow and Difference (using universal gates only) by applying
Boolean theorems:

RESULT :
Realized adder/ subtractor circuit and verified the truth table

Date of Experiment| Faculty Signature|Vani Devi/Smrithi Lakshmi / Gibi K Thomas/Sasikala EC|SOE|CUSAT

 Name:
Digital Electronics Lab Record Sheets
July- November 2017

Class work on ________________

(Report the special experiment/class work discussed in lab with its circuit diagram and its observation and inference)

Date of Experiment| Faculty Signature|Vani Devi/Smrithi Lakshmi / Gibi K Thomas/Sasikala EC|SOE|CUSAT

 Name:
Digital Electronics Lab Record Sheets
July- November 2017

Experiment No:2 a

BINARY TO GRAY & GRAY TO BINARY

CODE CONVERTER

AIM: - To convert given 4 bit binary number to gray codes and vice versa

COMPONENTS REQUIRED:

IC 7486

PROCEDURE: -
1. The circuit connections are made as shown in fig.

2. Pin (14) is connected to +Vcc and Pin (7) to ground.

3. In the case of binary to gray conversion, the inputs B0, B1, B2 and B3 are given
at respective pins and outputs G0, G1, G2, G3 are taken for all the
16 combinations of the input.

4. In the case of gray to binary conversion, the inputs G0, G1, G2 and G3 are given
at respective pins and outputs B0, B1, B2, and B3 are taken for all the 16
combinations of inputs.

CIRCUIT DIAGRAM: -

Binary To Gray Gray To Binary

Date of Experiment| Faculty Signature|Vani Devi/Smrithi Lakshmi / Gibi K Thomas/Sasikala EC|SOE|CUSAT

 Name:
Digital Electronics Lab Record Sheets
July- November 2017

TRUTH TABLE FOR BOTH: -

(Complete the truth table)

Inputs Outputs
B3 B2 B1 B0 G3 G2 G1 G0
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 0
0 1 1 1
1 0 0 0
1 0 0 1
1 0 1 0
1 0 1 1
1 1 0 0
1 1 0 1
1 1 1 0
1 1 1 1

RESULT :

The GRAY-to-BINARY and BINARY to-GRAY CODE converters were wired

and verified the truth table.

Date of Experiment| Faculty Signature|Vani Devi/Smrithi Lakshmi / Gibi K Thomas/Sasikala EC|SOE|CUSAT

 Name:
Digital Electronics Lab Record Sheets
July- November 2017

Experiment no: 2 b

BINARY TO GRAY /GRAY TO BINARY CODE CONVERTER USING MODE

CONTROL

AIM:

A Gray to Binary and Binary to Gray code converter is set up using a mode
control pin m such that when M=0 it functions as Binary to Gray code converter band when
M=1 it functions as a Gray to Binary code converter.

COMPONENTS REQUIRED :

IC 7486
IC 7408

TRUTH TABLE

Mod Inputs Outputs Mode Inputs Outputs

e

M D2 D D Y Y Y M D2 D1 D0 Y2 Y1 Y0
1 0 2 1 0

0 0 0 0 0 0 0 1 0 0 0 0 0 0

0 0 0 1 0 0 1 1 0 0 1 0 0 1

0 0 1 0 0 1 1 1 0 1 1 0 1 0

0 0 1 1 0 1 0 1 0 1 0 0 1 1

0 1 0 0 1 1 0 1 1 1 0 1 0 0

0 1 0 1 1 1 1 1 1 1 1 1 0 1

0 1 1 0 1 0 1 1 1 0 1 1 1 0

0 1 1 1 1 0 0 1 1 0 0 1 1 1

Y2=D2

Y1=D1 D2

Y0=MD2 (D1 D0)

Date of Experiment| Faculty Signature|Vani Devi/Smrithi Lakshmi / Gibi K Thomas/Sasikala EC|SOE|CUSAT

 Name:
Digital Electronics Lab Record Sheets
July- November 2017

CIRCUIT DIAGRAM :

(Draw the circuit here)

RESULT :

A gray to binary and binary to gray code converter using mode control circuit is
wired and verified the truth table

Date of Experiment| Faculty Signature|Vani Devi/Smrithi Lakshmi / Gibi K Thomas/Sasikala EC|SOE|CUSAT