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ELECTRICAL ENGINEERING DEPARTMENT

EE202

DIGITAL ELECTRONICS

NOT,AND,OR,NAND, and NOR GATES

PREPARED FOR:

MR. RABINDRA A/L GANDHI THAGARAJOO

PREPARED BY:

MUHD. AMIRUL MUKMININ BIN ZAKARIA 06DTK11F1017

AHMAD ARIFF FADHIL BIN SUHAIMI 06DTK11F1023


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DATE : 6/12/2012

EXPERIMENT : 1 (A)

SUBJECT : NOT,AND,OR,NAND and NOR gates.

OBJECTIVE(S) : - Recognise the Basic Logic Gates (NOT,AND,OR,NAND and NOR).

-To identify the operations of NOT,AND,OR,NAND and NOR gates according to

respective truth tables.

EQUIPMENT(S): Digital ICs (IC 74LS08,IC 74LS32,IC 74LS04,IC 74LS00 and IC 74LS02), Digital Trainer,

Single Core Wire, Breadboard/Prototyping board, Cutter and IC extractor.

THEORY :

Logic Gates

Electronic Gates require a high power supply Gates INPUT are driven by voltages having two nominal values.(0V representing logic 0,wheres

5V represents logic 1).

The OUTPUT of a gates provides two nominal values of voltage only.(In general, there is onlyone output to a logic gates).

The is always a time delay between an input being applied and output responding.Truth Table

Truth Table are used to represents the functions of specified logic gates.

Logic Gates Distinctive Shape Truth Table Description

AND -Require two inputs

and have one output.

-It only produces an

output of one when

both the inputs are 1,

otherwise the output

is 0.


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NOT -Also known as

inverter, because it

changes the input into

its opposite.

-Only accept one

input, the output is

opposite of the input

(in other words, a low

voltage input (0) is

converted to a high

voltage output).

OR -Has two input lines

and one output lines.

-Basically, if either or

both of the inputs are

one, the resulting

output value is a 1.

NAND -A NOT-AND gate

which is equal to an

AND followed by a

NOT gate.

-The output of all

NAND gates are high if

any of the inputs are

low.

-The small circle

represents inversion.

NOR -A NOT-OR gate which

is equal to an OR gate

followed by a NOT

gate.

-The outputs of all

NOR gates are low if

any of the inputs are


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high.

-The small circle

represents inversion.

Experiment Procedure 1:

NOT Gate (1a)

1. Digital Trainer are connected to the 220V AC power supply.2.

By using IC 74LS04, the circuit are connected:

Pin 1 Pin 2

SW 1

3. Connections to the IC consulting gate ICs data sheet and pin configuration diagram are made.4.

IC are being power up by applying +5 volts at pin 14 and grounding pin 7.

5. Data switch SW1 are set to logic 0, the results of L1 are stated in the truth table below.6. Data switch SW1 are then set to logic 1,and the output are verified.0 used to show low

input/output signal; while 1 used to show high input/output signal.

7. Truth Table are completed based on the experiment results.

Input SW 1

Output (L1)

Theory Practical

0 1 1

1 0 0

Table 1.1 : Truth Table for NOT gate


AND Gate (2a)

1. By using IC 74LS08, the circuit are connected:


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Input A (to SW 1) output (to L1)

Input B (to SW 2)

2. IC are connected by applying +5V at pin 14 and grounding pin 7.3. Data switch SW1 and SW2 are set to logic 0.The results are tabulated in the truth table below.4. Data switch SW1 are set to logic 0 while SW2 to logic 1.Results L1 shown in the truth table

below.

5. Data switch SW1 and SW2 are set following the truth table below. Output verified and truthtable are filled up.

Input Output (L1)

A = SW 1 B = SW 2 Theory Practical

0 0 0 0

0 1 0 0

1 0 0 0

1 1 1 1

Table 1.3 : Truth Table for AND gate

NAND Gate (2b)

1. By using IC 74LS00, the circuit are connected:SW 1 L1

SW 2

2. IC are connected by applying +5V at pin 14 and grounding pin 7.3. Data switch SW1 and SW2 are set to logic 0.The results are tabulated in the truth table below.


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4. Data switch SW1 are set to logic 0 while SW2 to logic 1.Results L1 shown in the truth tablebelow.

5. Data switch SW1 and SW2 are set following the truth table below. Output are verified and truthtable are filled up.

Input Output (L1)


0 0 1 1

0 1 1 1

1 0 1 1

1 1 0 0

6. Table 1.5 : Truth Table for NAND gate


OR Gate (3a)

1. By using IC 74LS32, the circuit are connected:PIN 1 SW1 L1

PIN 2 SW 2 PIN 3

2. IC are connected by applying +5V at pin 14 and grounding pin 7.3. Data switch SW1 and SW2 are set to logic 0.The results are tabulated in the truth table below.4. Data switch SW1 are set to logic 0 while SW2 to logic 1.Results L1 shown in the truth table

below.

5. Data switch SW1 and SW2 are set following the truth table below. Output are verified and truthtable are filled up.


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Input Output (L1)

A = =SW 1 B = SW 2 Theory Practical

0 0 0 0

0 1 1 1

1 0 1 1

1 1 1 1

Table 1.8 : Truth Table for OR gate

NOR Gate (3b)

1. By using IC 74LS02, the circuit are connected:PIN 3 SW 1 L1

PIN 2 SW 2 PIN 1

2. IC are connected by applying +5V at pin 14 and grounding pin 7.3. Data switch SW1 and SW2 are set to logic 0.The results are tabulated in the truth table below.4. Data switch SW1 and SW2 are set following the truth table below. Output are verified and truth

table are filled up.

Input Output (L1)


0 0 1 1

0 1 0 0

1 0 0 0

1 1 1 0

Table 1.10 : Truth Table for NOR gate


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DISCUSSION :

1. Based from the results of the experiments, NOT gate (inverter) truth table are not same asNAND and NOR gate truth table. This is because NOT gate in electronic circuit produces an

inverted version of the input at its output. If the input variable is A, the inverted output is known

as NOT A (also known as ).

2. Observation from the procedures are:-ICs used for every experiment to study a variety of Truth Table are different from one another.

-all ICs are powered by +5V at pin 14 and grounded at pin 7.

-excepts for NOT gate, all the ICs data switch SW1 and SW2 are set to logic 0.


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DATE : 13/1/2012

EXPERIMENT : 1(B)(Combinational Logic Gates)

OBJECTIVES : - Find out and identify the operation of Basic Logic Gates and their Truth Table.

- Create Logic Gates and circuit and truth table.- Fabricate the affiliation Logic Gates circuit and truth table from the Boolean

expressions.

EQUIPMENT(S): Digital ICs (IC 74LS08,IC 74LS32,IC 74LS04,IC 74LS00 and IC 74LS02), Digital Trainer,

Single Core Wire, Breadboard/Prototyping board, Cutter and IC extractor.

Procedure :

1. The circuit are connected as shown by using a appropriate ICs.SW1 L1 L2

SW2

L4

SW3 L3

SW4

2. SW1,SW2,SW3 and SW4 are tuned on to the origin position that suitable to the truth table 1.6 inpart 2 result and the output state are recorded.


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RESULT :

INPUT OUTPUT

SW1 SW2 SW3 SW4 L1 L2 L3 L4

Theory Practical Theory Practical Theory Practical Theory Practical

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


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DISCUSSION :

1. The truth table for 3 inputs AND gate:INPUT OUTPUT

A B C Y

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

2. The truth table for 3 inputs NOR gate:INPUT OUTPUT

A B C Y

0 0 0 1

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 0


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3. Logical circuit base expression with truth table solution.

a. M = ( A . B ) + ( C + D )A

B M

C

D

Circuit Truth Table

INPUT OUTPUT

A. B C + D M = ( A . B ) + ( C + D )

0 0 0 0 0

0 1 0 1 1

1 0 0 1 1

1 1 1 1 1


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b. Z = ( M + N ) ( P. Q )M

N M

P

Q

Circuit Truth Table

INPUT OUTPUT

M + N P . Q Z = ( M + N ) ( P. Q )

0 0 1 0 0

0 1 0 1 0

1 0 0 0 0

1 1 0 0 0


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CONCLUSION :

1. Logic Gates is physical device implementing Boolean Function, as it performs a logical operationon one or more logic inputs and produces a single logic output.

2. Digital Electronics system are used to be constructed by using a Logic Gates. Thesegates are the AND,NOT,OR,NAND,NOR,EXOR and EXNOR (we only studying about

AND,NOT,OR,NOR and NAND).

3. With the aid from Truth Table, the basic operations of these Logic Gates can be described.4. Logic Gates are primarily implemented using diodes or transistors and acts as electronic

switches.

REFERENCE :

1.http://en.wikipedia.org/wiki/Logic_gate (12/1/2010,2013)

2.http://simple.wikipedia.org/wiki/Logic_gate (12/1/2012, 2015)

3.http://whatis.techtarget.com/definition/0,,sid9_gci213512,00.html (12/1/2012, 2019)

4.http://www.ee.surrey.ac.uk/Projects/Labview/gatesfunc/index.html5. (12/1/2012, 2025)


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