# ET220 : Module 1 Introduction to Digital Technology

| January 11, 2016

## 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.

## 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:

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:

## 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.

## 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

• 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:

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

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

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?

1. Make sure that the power supply is switch off
2. Test the wire
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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