ET220 : Module 1 Introduction to Digital Technology

| January 11, 2016
 

Name:

     

Date:

   

 

Grade:

 

 

Instructions:

 

  • Complete Part 1, then Part 2 sections of the Lab 1.1.  Then, complete this Lab Report by filling in all details. Use information you gained during your experimentation to complete the answers.
  • Be sure to submit your lab report before the deadline.

     

 

Part 1- Binary-to-Decimal Number Conversion

 

Theory:

 

  1. Enter the decimal, hexadecimal, and BCD numbers for each of the following binary numbers.

 

Binary

Hexadecimal

BCD

Decimal

0000

     

0001

     

0010

     

0011

     

0100

     

0101

     

0110

     

0111

     

1000

     

1001

     

1010

     

1011

     

1100

     

1101

     

1110

     

1111

     

 

  1. Explain major differences between binary and BCD numeric representations.

     

 

Planning:

 

  1. Provide a list of places that you can obtain the datasheets for the following components:

 

  • SN74LS47  Binary to BCD Decoder
  • MAN72 Seven Segment Display
  • 4116R 1-331 330 ohm Resistor Pack

 

 

 

Preparation:

 

2.       Why is it important to follow ESD safety procedures when handling electronic components? What are some of the main considerations?

 

 

 

Wiring Procedure:

 

3.       Complete the wiring diagram.  Refer to Lab 1.1 Figure 1-4 and image 1 & 2 of the ET1220.U1.Lab.Images PowerPoint.  Use MS Paint to complete the wiring diagram.

 

 

 

 

 

 

Test Procedure:

 

4.       Record the observed values from Lab 1.1 Table 1-1.  Indicate which segments are illuminated for each input setting.

 

Inputs

Output

 

Binary

Data Lines

BCD Number

Seven Segment Display

 

 

3

2

1

0

 

 

 

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

Invalid

 

1

0

1

1

Invalid

 

1

1

0

0

Invalid

 

1

1

0

1

Invalid

 

1

1

1

0

Invalid

 

1

1

1

1

Invalid

 

 

 

 

 

 

Troubleshooting:

 

5.       For each trouble investigated, record your observations from Lab 1.1 Table 1-2. 

 

Trouble Trouble Observations

1

LED for the C segment is open. Break the connection to pin C of the 7-segment display (remove the wire).  

2

An input to the 7447 is open. Break the connection to the input A pin of the 7447 (remove the wire).  

3

1000 ohm resistor is open.(Remove the 1kΩ resistor).  

 

 

 

6.       Assume that the switches are set to a binary 1000 value, but the display shows a zero.  What are three possible causes for this error?

 

 

 

 

 

 

 

Part 2- Binary-Number Addition and Two’s Complement Subtraction

 

Theory:

 

  1. Provide the results for the half-adder truth table.

     

     

 

A0

+

B0

S1S0

0

+

0

 

0

+

1

 

1

+

0

 

1

+

1

 

 

 

 

 

 

  1. Provide the results for the full-adder truth table.

 

 

 

 

 

 

A0

+

B0

+

Cin

CoutS

0

+

0

+

0

 

1

+

0

+

0

 

0

+

1

+

0

 

0

+

0

+

1

 

1

+

1

+

0

 

1

+

0

+

1

 

0

+

1

+

1

 

1

+

1

+

1

 

 

 

 

Planning:                                                  

 

  1. Provide a list of places (links) where you can obtain the datasheets for the following components:

 

  • 74LS08 Quad AND Gate
  • 74LS32 Quad OR Gate
  • 74LC86 Quad XOR Gate

     

    Preparation:

 

  • What are several important things you should consider before wiring your circuit? 

 

 

 

 

Wiring Procedure:

 

  1. Complete the adder wiring diagram.  Refer to Lab 1.1 Figure 1-12 and image 10 of the ET1220.U1.Lab.Images PowerPoint.  Use MS Paint to complete the wiring diagram.

 

 

 

 

Test Procedure:

 

  1. Record the observed values from Lab 1.1 Table 1-3. 

 

Switch

 

Switch

 

 

 

4

3

Decimal Value of B

2

1

Decimal Value of A

 

 

B1

B0

A1

A0

Calculated

Sum

7-Segment

Display

0

0

0

0

0

0

0

0

0

0

0

0

1

1

 

 

0

0

0

1

0

2

 

 

0

0

0

1

1

3

3

 

0

1

1

0

0

0

 

 

0

1

1

0

1

1

 

 

0

1

1

1

0

2

 

 

0

1

1

1

1

3

4

 

1

0

2

0

0

0

 

 

1

0

2

0

1

1

 

 

1

0

2

1

0

2

 

 

1

0

2

1

1

3

5

 

1

1

3

0

0

0

 

 

1

1

3

0

1

1

 

 

1

1

3

1

0

2

 

 

1

1

3

1

1

3

 

 

 

 

 

 

 

Attachments:

 

Name:

     

Date:

     

Grade:

 

Instructions:

  • Complete Part 1, then Part 2 sections of the Lab 1.1. Then, complete this LabReport by filling in all details.  Use information you gained during your experimentation to complete the answers.
  • Be sure to submit your lab report before the deadline.

 

Part 1- Binary-to-Decimal Number Conversion

Theory:

  1. Enter the decimal, hexadecimal, and BCD numbers for each of the following binary numbers.
Binary Hexadecimal BCD Decimal
0000 0 0000 0
0001 1 0001 1
0010 2 0010 2
0011 3 0011 3
0100 4 0100 4
0101 5 0101 5
0110 6 0110 6
0111 7 0111 7
1000 8 1000 8
1001 9 1001 9
1010 A Invalid 10
1011 B Invalid 11
1100 C Invalid 12
1101 D Invalid 13
1110 E Invalid 14
1111 F Invalid 15
  1. Explain major differences between binary and BCD numeric representations.

Ans 2:

BCD each digit of a decimal number is coded as a 4 bit binary number between 0 and 9. This is not used too often as it is difficult to do calculations in BCD as opposed to binary, and it is not efficient – uses more bits than a binary coded number would.

In Binary the number is converted to base 2, binary code.

 

 

Planning:

  1. Provide a list of places that you can obtain the datasheets for the following components:
  • SN74LS47 Binary to BCD Decoder

http://www.onsemi.com/pub_link/Collateral/SN74LS47-D.PDF

 

  • MAN72 Seven Segment Display

http://web.ece.ucdavis.edu/~bbaas/180a/Datasheets/man72a.pdf

 

  • 4116R 1-331 330 ohm Resistor Pack

http://www.digchip.com/datasheets/parts/datasheet/1896/4116R-1-331-pdf.php

 

Preparation:

  1. Why is it important to follow ESD safety procedures when handling electronic components? What are some of the main considerations?

Ans2

These precautions protect sensitive electronic components

Extremely fast response time

Low clamping and operating voltage

Capacity of handle high peak ESD current

Ability to remain undamaged by repetitive ESD strikes

Minimize size

Minimal reverse leakage current

Wiring Procedure:

  1. Complete the wiring diagram. Refer to Lab 1.1 Figure 1-4 and image 1 & 2 of the ET1220.U1.Lab.Images PowerPoint.  Use MS Paint to complete the wiring diagram.

 

 

Test Procedure:

  1. Record the observed values from Lab 1.1 Table 1-1. Indicate which segments are illuminated for each input setting.
Inputs Output  
Binary

Data Lines

BCD Number Seven Segment Display  
 
3 2 1 0      
0 0 0 0 0000  
0 0 0 1 0001  
0 0 1 0 0010  
0 0 1 1 0011  
0 1 0 0 0100  
0 1 0 1 0101  
0 1 1 0 0110  
0 1 1 1 0111  
1 0 0 0 1000  
1 0 0 1 1001  
1 0 1 0 Invalid  
1 0 1 1 Invalid  
1 1 0 0 Invalid  
1 1 0 1 Invalid  
1 1 1 0 Invalid  
1 1 1 1 Invalid  

 

 

Troubleshooting:

  1. For each trouble investigated, record your observations from Lab 1.1 Table 1-2.
Trouble Trouble Observations
1 LED for the C segment is open. Break the connection to pin C of the 7-segment display (remove the wire). Accept 2

All output will be wrong

2 An input to the 7447 is open. Break the connection to the input A pin of the 7447 (remove the wire). Odd numbers will not display
3 1000 ohm resistor is open. (Remove the 1kΩ resistor). Output will be blank

 

 

  1. Assume that the switches are set to a binary 1000 value, but the display shows a zero. What are three possible causes for this error?

 

 

Ans6:

  1. The input D pin of the 7447 is open .
  2. LED for the f segment is open.
  3. Power supply to switch is open .

 

Part 2- Binary-Number Addition and Two’s Complement Subtraction

Theory:

  1. Provide the results for the half-adder truth table.

 

 

A0 + B0 S1S0
0 + 0 00
0 + 1 01
1 + 0 01
1 + 1 10
       
  1. Provide the results for the full-adder truth table.

 

 

  A0 + B0 + Cin CoutS
0 + 0 + 0 00
1 + 0 + 0 01
0 + 1 + 0 01
0 + 0 + 1 01
1 + 1 + 0 10
1 + 0 + 1 10
0 + 1 + 1 10
1 + 1 + 1 11

 

Planning:                                                  

  1. Provide a list of places (links) where you can obtain the datasheets for the following components:
  • 74LS08 Quad AND Gate

http://www.cs.smith.edu/~thiebaut/270/datasheets/sn74ls08rev5.pdf

 

  • 74LS32 Quad OR Gate

http://www.cs.smith.edu/~thiebaut/270/datasheets/sn74ls32rev5.pdf

 

  • 74LC86 Quad XOR Gate

https://courses.cs.washington.edu/courses/cse477/99au/assignments/lab2/74ls86.pdf

 

Preparation:

  1. What are several important things you should consider before wiring your circuit?

Answer :

 

 

  1. Make sure that the power supply is switch off
  2. Test the wire
  3. Test your ICs
  4. Draw the rough sketch with ICs PIN number before actual connection to avoid any confusion while wiring circuit on breadboard

 

 

 

Wiring Procedure:

  1. Complete the adder wiring diagram. Refer to Lab 1.1 Figure 1-12 and image 10 of the ET1220.U1.Lab.Images PowerPoint.  Use MS Paint to complete the wiring diagram.

 

Test Procedure:

  1. Record the observed values from Lab 1.1 Table 1-3.
Switch   Switch      
4 3 Decimal Value of B 2 1 Decimal Value of A    
B1 B0 A1 A0 Calculated

Sum

7-Segment

Display

0 0 0 0 0 0 0 0
0 0 0 0 1 1 1 1
0 0 0 1 0 2 2 2
0 0 0 1 1 3 3 3
0 1 1 0 0 0 1 1
0 1 1 0 1 1 2 2
0 1 1 1 0 2 3 3
0 1 1 1 1 3 4 4
1 0 2 0 0 0 2 2
1 0 2 0 1 1 3 3
1 0 2 1 0 2 4 4
1 0 2 1 1 3 5 5
1 1 3 0 0 0 3 3
1 1 3 0 1 1 4 4
1 1 3 1 0 2 5 5
1 1 3 1 1 3 6 6

 

 

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