EEN 1200 L – Digital Fundamentals Merrimack College Laboratory 2 – Introduction to 7404 Hex Inverter & Basic Gates & Timing Diagrams NAME _____________________________ The purpose of this laboratory experiment is to: I. Get practice in wiring integrated circuits on the trainers II. Generate “Truth Tables” for basic gates. III. Use these logic elements to generate a high level logic element. IV. Generate the “Truth Table”, and identify the logic element. V. Generate timing diagrams for the basic gates. Part A: Introduction to 7404 Hex Inverter (IC) Hook up the 7404 Hex Inverter integrated circuit, and look at the input and output of ONE of the inverters (pins 1 and 2). Note: There are 6 inverters in the same package, hence the term Hex. See pin-outs of the 7404 Hex Inverter at the last page. A B Z A B Z A B Z A B C Z Z A B Logic 1 Logic 1 A B Z A-1) Using the built in signal generator (RED Trainer), place a 1 kHz and TTL input to the inverter. [Be sure to connect the IC (pin 14) to 5VDC and (pin 7) to the ground (GND)]. Look at the input and output together on the scope using 2 Volts DC per division. Draw what you see: Output Waveform Input Waveform Note: Label the x-axis and y-axis A-2) What is the period? ________________milli-seconds A-3) Use 5.0 VDC per division on the scope, then read the following on the scope. Draw what you see below. Voltage amplitude of input=____________ Voltage amplitude of output=____________ Frequency of input=____________ Frequency of output=____________ Period of input=____________ Period of output=____________ Note: Label the x-axis and y-axis Part B: Basic Gates & Timing Diagrams A B Z A Truth Table consists of all possible logic inputs and the output that corresponds to each logic input. In the following, an AND Gate with logic inputs A & B with a logic output Z is shown: A input B input Z output 0 0 0 1 0 0 0 1 0 1 1 1 The timing diagram is discussed at length in Chapter 3. The basic timing diagrams for the logic gates we are using in this lab allow for a visual reading of how the logic functions. By viewing the timing diagram, the reader can see what outputs result from the different possible combinations of inputs. The truth table can easily be determined by looking at the basic timing diagram. B-1) Follow steps of part A-1 to hook up the 7408 of Quad 2-Input AND gate, then connect input A to SW7 and input B to SW6 then generate a truth table below by measuring output Z using voltmeter. Connect a wire from the output pin to any of the 8 bits LED display located on the upper right corner of the function generator. Note: There are 4 AND gates in the same package. A B C Z Input A Input B output Z 0 0 1 0 0 1 1 1 B ...

1. EEN 1200 L – Digital Fundamentals
Merrimack College
Laboratory 2 – Introduction to 7404 Hex Inverter & Basic Gates
& Timing Diagrams
NAME _____________________________
The purpose of this laboratory experiment is to:
I. Get practice in wiring integrated circuits on the trainers
II. Generate “Truth Tables” for basic gates.
III. Use these logic elements to generate a high level logic
element.
IV. Generate the “Truth Table”, and identify the logic element.
V. Generate timing diagrams for the basic gates.
Part A: Introduction to 7404 Hex Inverter (IC)
Hook up the 7404 Hex Inverter integrated circuit, and look at
the input and output of ONE of the inverters
(pins 1 and 2). Note: There are 6 inverters in the same package,
hence the term Hex. See pin-outs of the 7404 Hex Inverter at
the last page.

2. A
B
Z
A
B
Z
A
B
Z
A
B
C
Z
Z
A
B
Logic 1
Logic 1

3. A
B
Z
A-1) Using the built in signal generator (RED Trainer), place a
1 kHz and TTL input to the inverter. [Be sure to connect the IC
(pin 14) to 5VDC and (pin 7) to the ground (GND)].
Look at the input and output together on the scope using 2 Volts
DC per division. Draw what you see:

6. Output Waveform
Input Waveform
Note: Label the x-axis and y-axis
A-2) What is the period? ________________milli-seconds
A-3) Use 5.0 VDC per division on the scope, then read the
following on the scope. Draw what you see below.

9. Voltage amplitude of input=____________
Voltage amplitude of output=____________
Frequency of input=____________
Frequency of output=____________
Period of input=____________
Period of output=____________
Note: Label the x-axis and y-axis
Part B: Basic Gates & Timing Diagrams
A
B
Z
A Truth Table consists of all possible logic inputs and the
output that corresponds to each logic input.

10. In the following, an AND Gate with logic inputs A & B with a
logic output Z is shown:
A input
B input
Z output
0
0
0
1
0
0
0
1
0
1
1
1
The timing diagram is discussed at length in Chapter 3. The
basic timing diagrams for the logic gates we are using in this
lab allow for a visual reading of how the logic functions. By
viewing the timing diagram, the reader can see what outputs
result from the different possible combinations of inputs. The
truth table can easily be determined by looking at the basic
timing diagram.
B-1) Follow steps of part A-1 to hook up the 7408 of Quad 2-
Input AND gate, then connect input A to SW7 and input B to
SW6 then generate a truth table below by measuring output Z
using voltmeter. Connect a wire from the output pin to any of
the 8 bits LED display located on the upper right corner of the
function generator. Note: There are 4 AND gates in the same
package.

11. A
B
C
Z
Input A
Input B
output Z
0
0
1
0
0
1
1
1
B-2) Connect a 1 kHZ, TTL to input A and keep input B
connected to SW6. First, put a “1” on input B. Look at input
A, the square wave, and the output of the AND using an
oscilloscope. Second, put a “0” on input B. Look at input A,
the square wave, and the output of the AND using an
oscilloscope. Draw both cases on the graph below

14. First case (input B=1)
Draw the input & the output
Second case (input B=0)
Draw the input & the output
Note: Label the x-axis and y-axis
B-3) Follow steps of part B-1 to hook up the 7432 Quad 2-Input
OR gate, and generate a truth table. Note There are 4 OR gates
in the same package.
A input
B input
Z output

15. B-4) Connect a 1 kHZ, TTL to input A and keep input B
connected to SW6. First, put a “1” on input B. Look at input
A, the TTL, and the output of the OR gate using an
oscilloscope. Second, put a “0” on input B. Look at input A,
the TTL, and the output of the OR gate using an oscilloscope.
Draw both cases on the graph below.

18. First case (input B=1)
Draw the input & the output
Second case (input B=0)
Draw the input & the output
Note: Label the x-axis and y-axis
B-5) Hook up the 7411 Triple 3-input AND gate, and generate a
truth table. Note: There are 3 AND gates in the same package.
Note: To turn on any gate pin7 has to be grounded and pin14
must be connected to +5V DC power supply.
A input
B input
C input
Z output

19. Z
A
B
Logic 1
Logic 1
B-5) Hook up the following circuit and generate a Truth Table.

20. A input
B input
Z output
Can you identify this logic element?
____________________________________
Write-up: Review and follow the lab write-up guidelines. Show
me your work before you leave.
Z
A
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B
C
Z
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22. B
Z
Logic 1
Logic 1
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B
Z
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23. A
B
Z
Forecasting Exercise Name
________________________
Consider the following probability distribution for losses for
your firm:
Probability Losses (in 000s)
.20 300
.30 200
.40 100
.10 5,000
1. Calculate the:
a. Expected Value of Losses
b. Variance
c. Standard Deviation
d. Coefficient of Variation

24. 2. A risk manager of a multi-location bicycle shop determined
that over the past 10 years, the firm suffered the following
annual theft losses to inventories of bicycle tires:
Years 1 $ 15,000
Years 2-4 $ 2,000
Year 5-6 $ 30,000
Years 7-10 4,000
Calculate the : a) mean or expected loss
b) Standard deviation
c) Coefficient of variation
d) In what range should theft losses fall 99 percent of
the time?