NEC2107
Experiment No. 1
UNIVERSITY OF THE EAST – CALOOCAN
COLLEGE OF ENGINEERING
EXPERIMENT NO. 1
INTRODUCTION TO MULTISIM
SUBMITTED BY:
JOHN PAUL DELA CRUZ
SUBMITTED DATE:
SEPTEMBER 23, 2021
eCAD
NEC2107
Experiment No. 1
eCAD
BASIC INFORMATION
The 74LS47 is an example of an IC device that decodes a BCD input and drives a 7-segment
display. In addition to its decoding and segment drive capability, the 74LS47 has several
additional features as indicated by the LT, RBI, BI / RBO functions in the logic symbol of Figure
4.1. As indicated by the bubbles on the logic symbol, all of the outputs (a through g) are activeLOW as are the LT (lamp test), RBI (ripple blanking input), and BI / RBO (blanking input/ripple
blanking output) functions. The outputs can drive a common-anode 7-segment display directly.
In addition to decoding a BCD input and producing the appropriate 7-segment outputs. The
74LS47 has lamp test and zero suppression capability. This device may be available in other TTL
or CMOS families.
Figure 1-19
OBJECTIVES:
1. To study the operation of a 7 segment display
2. To verify the operation if BCD to seven segment decider/driver
SKILLS REQUIRED
In order for the experiment to proceed smoothly, the students must be familiar with
1. Seven segment displays
2. BCD to seven segment decoder
NEC2107
Experiment No. 1
eCAD
PROCEDURE
Step 1. Create the decoder circuit shown in Figure 1-20. Use data switches for the inputs
STEP 2. Turn the RUN button ON. Move the data switches to HIGH and/or LOW positions
as indicated.
STEP 3. Apply the logic segments specified in Table 1-1 to the corresponding inputs.
Observe the segment display and record observations in Table 1-2.
STEP 4. Observe the LED indicators and record observations in Table 1-1
SW1
U1
A
SW2
B
SW3
7
1
2
6
A
B
C
D
3
5
4
~LT
~RBI
~BI/RBO
OA
OB
OC
OD
OE
OF
OG
13
12
11
10
9
15
14
R1
a
R2
b
R3
c
R4
d
74LS47N
R5
e
C
R6
f
R7
SW4
g
D
SW5
LT
SW6
RB1
Figure 1-20
Table 1-1
NEC2107
LT
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Experiment No. 1
RBI
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
A
B
0
0
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
C
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
D
0
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
a
1
1
1
0
1
0
0
1
0
0
0
0
1
1
1
1
0
1
0
b
1
1
1
0
1
1
1
1
0
0
0
1
1
0
0
1
0
1
0
eCAD
c
1
1
1
0
1
1
0
0
0
1
0
1
1
1
0
1
1
1
0
d
1
1
1
0
1
0
0
1
1
1
1
0
0
1
1
1
1
0
0
e
1
1
1
0
1
0
0
1
1
1
1
0
0
0
0
0
0
0
0
f
1
1
1
0
1
1
1
0
0
1
1
0
1
1
1
0
0
0
0
g
1
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
0
0
STEP 4. Apply the logic segments specified in Table 1-2 to the corresponding inputs.
Observe the segment display and record observations in Table 1-2.
Table 1-2
NEC2107
Experiment No. 1
LT
RBI
A
B
C
D
1
0
0
0
0
0
1
0
0
0
0
1
1
0
0
0
1
0
1
0
0
0
1
1
1
0
0
1
0
0
1
0
0
1
0
1
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DISPLAY
NEC2107
Experiment No. 1
1
0
0
1
1
0
1
0
0
1
1
1
1
0
1
0
0
0
1
0
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
1
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NEC2107
Experiment No. 1
1
0
1
1
0
0
1
0
1
1
0
1
1
0
1
1
1
0
1
0
1
1
1
1
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NEC2107
Experiment No. 1
eCAD
REVIEW QUESTIONS.
1. From the output Table 1-1, what type of display will the 74LS47 drive?
This is the purpose of 7447 driver IC. It takes BCD inputs and generates the 7
output lines for the 7 segment LED. Also output buffers are present so that it can supply
enough current to drive all the LEDs properly. Aslo create a binary logic table in able
to show display.
2. Would you select a decoder/driver with active-HIGH or active-LOW outputs to drive a
common-cathode 7-segment LED display?
Selecting a drive to run the common cathode a 7 segment display is needed to
decode every high and low for a LED output in display.
3. In what input combinations are the unrecognizable character in Table 1-2 generated?
Row 1 (100000)
Row 4 (100011)
Row 7 (100110)
Row 8 (100111)
Row 12 (101011)
Row 14 (101101)
Row 16 (101111)
NEC2107
Experiment No. 1
eCAD
EXPERIMENTAL DISCUSSION
(LCC, 1999) the SN74LS47 are Low Power Schottky BCD to 7 Segment
Decoder/Drivers consisting of Nand gates, input buffers and seven Andor Invert
gates. They offer active low, high sink current outputs for driving indicators directly.
Seven Nand gates and one driver are connected in pairs to make BCD data and its
complement available to the seven decoding And-Or-Invert gates. The remaining
Nand gate and three input buffers provide lamp test, blanking input ripple blanking
output and ripple blanking input. The circuits accept 4 bit binary coded decimal (BCD)
and, depending on the state of the auxiliary inputs, decodes this data to drive a 7
segment display indicator. The relative positive logic output levels, as well as
conditions required at the auxiliary inputs, are shown in the truth tables. Output
configurations of the SN74LS47 are designed to withstand the relatively high voltages
required for 7-segment indicators.
Seven segment show consists of led's that are arranged in 2 configuration.
First configuration has all the LED anode's linked together and this configuration 7
segment show is known as common anode 7 phase show. The different configuration
is opposite to the first one wherein all of the LED's cathodes are connected
collectively and this configuration is recognize as common cathode 7 segment show,
On those configuration bases seven segments are divided in to 2 kinds not common
anode and common cathod. Both configuration has a few pros and con
BCD to seven segment decoder is a circuit used to convert the input BCD into
a form suitable for the display. It has four input lines (A, B, C and D) and 7 output
lines (a, b, c, d, e, f and g) as shown in Figure 1-2. Considering common anode type
of arrangement, the truth table for the decoder can be given as in Table 1-1. The table
1-1 indicates the segments which are to be driven high to obtain certain decimal digit
at the output of the seven segment display. However, it is to be noted that in the case
of common anode type, the only change will be to interchange ones and zeros on the
table. This means that from the table so obtained one can get to know where low has
to be driven so as to obtain the required digit at the output.
NEC2107
Experiment No. 1
eCAD
Multisim is used upon this experimentation. In this software the data are able
to create the experiment diagram with its functionality not deferred any action. Beside
actual experimentation I discuss the diagram as genuinely capable of handling
problems in biasing components through it. On additional notes area bellow at figure
2-1, we can see the diagram of the experimentation we conducted virtually.
CONCLUSION
Throughout the immense data I gathered, accordingly with all parameters
checked and sustained utilization of the observation I made. I conclude that there are
many uses for IC SN747LS47 in the industry, but the basic parameter we can
experiment on is the decoding of binary in order to display a cathode or anode output
that make a seven segment light in a pattern for us in able to determine it's outcome
display. By in these IC we have the idea of decoding the binary in theoretical way of
ones and zeroes.
BCD (Binary Coded Decimal) is an encoding scheme which represents each
of the decimal numbers by its equivalent a-bit binary pattern. Seven segment displays
comprise of seven individual segments formed by either Light Emitting Diodes (LEDs)
or Liquid Crystal Displays (LCDs) arranged in a definite pattern.
Multisim software integrates industry-standard simulation with an interactive
schematic environment to instantly visualize and analyze electronic circuit behavior.
The use of Multisim is very convenient for an individual. Its intuitive interface helps
educators reinforce circui23r4wet theory and improve retention of theory throughout
engineering curriculum. By adding powerful circuit simulation and analyses to the
design flow, Multisim helps researchers and designers reduce printed circuit board
(PCB) prototype iterations, enable to conduct experiments without hesitations, and
save development costs. As I finalize my statement, learning ways of creating circuits
through this software can surely enable us to learn the concept of hardware use in
electronics.
NEC2107
REFERENCES (APA Format):
Internet Source
Experiment No. 1
eCAD
NEC2107
Experiment No. 1
Name: Dela Cruz, John Paul
INSTRUCTORS INITIAL: _Engr. Gubangco_
DATE PERFORMED: _August 20, 2021_
eCAD