The document details the specifications and functionalities of the DM7446A and DM7447A BCD to 7-segment decoders/drivers, which are designed to directly drive common-anode LEDs or incandescent indicators, featuring active-low outputs and various input control modes. It includes information on electrical characteristics, recommended operating conditions, and maximum ratings, along with a function table and ordering information for two package types. Additional context is provided regarding laboratory instructions for simulating and building circuits using these components.

1. 7447_datasheet.pdf
© 2001 Fairchild Semiconductor Corporation DS006518
www.fairchildsemi.com
September 1986
Revised July 2001
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DM7446A, DM7447A
BCD to 7-Segment Decoders/Drivers
General Description
The DM7446A and DM7447A feature active-LOW outputs

3. designed for driving common-anode LEDs or incandescent
indicators directly. All of the circuits have full ripple-blank-
ing input/output controls and a lamp test input. Segment
identification and resultant displays are shown on a follow-
ing page. Display patterns for BCD input counts above nine
are unique symbols to authenticate input conditions.
All of the circuits incorporate automatic leading and/or trail-
ing-edge, zero-blanking control (RBI and RBO). Lamp test
(LT) of these devices may be performed at any time when
the BI/RBO node is at a HIGH logic level. All types contain
an overriding blanking input (BI) which can be used to con-
trol the lamp intensity (by pulsing) or to inhibit the outputs.
Features
■ All circuit types feature lamp intensity modulation
capability
■ Open-collector outputs drive indicators directly
■ Lamp-test provision
■ Leading/trailing zero suppression
Ordering Code:
Connection Diagram
Order Number Package Number Package Description
DM7446AN N16E 16-Lead Plastic Dual-In-Line Package
(PDIP), JEDEC MS-001, 0.300" Wide
DM7447AN N16E 16-Lead Plastic Dual-In-Line Package

4. (PDIP), JEDEC MS-001, 0.300" Wide
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Function Table
H = HIGH level, L = LOW level, X = Don’t Care
Note 1: BI/RBO is a wire-AND logic serving as blanking input
(BI) and/or ripple-blanking output (RBO).
Note 2: The blanking input (BI) must be OPEN or held at a

5. HIGH logic level when output functions 0 through 15 are
desired. The ripple-blanking input (RBI)
must be OPEN or HIGH if blanking of a decimal zero is not
desired.
Note 3: When a LOW logic level is applied directly to the
blanking input (BI), all segment outputs are HIGH regardless of
the level of any other input.
Note 4: When ripple-blanking input (RBI) and inputs A, B, C,
and D are at a LOW level with the lamp test input HIGH, all
segment outputs go H and the rip-
ple-blanking output (RBO) goes to a LOW level (response
condition).
Note 5: When the blanking input/ripple-blanking output
(BI/RBO) is OPEN or held HIGH and a LOW is applied to the
lamp-test input, all segment outputs are
L .
Logic Diagram
Decimal or Inputs BI/RBO Outputs
Note
Function LT RBI D C B A (Note 1) a b c d e f g
0 H H L L L L H L L L L L L H
1 H X L L L H H H L L H H H H
2 H X L L H L H L L H L L H L
3 H X L L H H H L L L L H H L
4 H X L H L L H H L L H H L L

6. 5 H X L H L H H L H L L H L L
6 H X L H H L H H H L L L L L
7 H X L H H H H L L L H H H H (Note 2)
8 H X H L L L H L L L L L L L
9 H X H L L H H L L L H H L L
10 H X H L H L H H H H L L H L
11 H X H L H H H H H L L H H L
12 H X H H L L H H L H H H L L
13 H X H H L H H L H H L H L L
14 H X H H H L H H H H L L L L
15 H X H H H H H H H H H H H H
BI X X X X X X L H H H H H H H (Note 3)
RBI H L L L L L L H H H H H H H (Note 4)
LT L X X X X X H L L L L L L L (Note 5)
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Absolute Maximum Ratings(Note 6)
Note 6: The “Absolute Maximum Ratings” are those values
beyond which
the safety of the device cannot be guaranteed. The device
should not be
operated at these limits. The parametric values defined in the
Electrical
Characteristics tables are not guaranteed at the absolute
maximum ratings.
The “Recommended Operating Conditions” table will define the
conditions
for actual device operation.
Recommended Operating Conditions
Supply Voltage 7V
Input Voltage 5.5V

8. Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range −65°C to +150°C
Symbol Parameter Min Nom Max Units
DM7446A
VCC Supply Voltage 4.75 5 5.25 V
VIH HIGH Level Input Voltage 2 V
VIL LOW Level Input Voltage 0.8 V
VOH HIGH Level Output Voltage (a thru g) 30 V
IOH HIGH Level Output Current (BI/RBO) −0.2 µA
IOL LOW Level Output Current (a thru g) 40 mA
IOL LOW Level Output Current (BI/RBO) 8 mA
TA Free Air Operating Temperature 0 70 °C
DM7447A
VCC Supply Voltage 4.75 5 5.25 V
VIH HIGH Level Input Voltage 2 V
VIL LOW Level Input Voltage 0.8 V
VOH HIGH Level Output Voltage (a thru g) 15 V
IOH HIGH Level Output Current (BI/RBO) −0.2 µA
IOL LOW Level Output Current (a thru g) 40 mA
IOL LOW Level Output Current (BI/RBO) 8 mA

9. TA Free Air Operating Temperature 0 70 °C
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DM7446A Electrical Characteristics
over recommended operating free air temperature range (unless
otherwise noted)
Note 7: All typicals are at VCC = 5V, TA = 25°C.
Note 8: ICC is measured with all outputs OPEN and all inputs at

10. 4.5V.
DM7446A Switching Characteristics
at VCC = 5V and TA = 25°C
Symbol Parameter Conditions Min
Typ
Max Units
(Note 7)
VI Input Clamp Voltage VCC = Min, II = −12 mA −1.5 V
VOH HIGH Level Output VCC = Min
2.4 3.7 V
Voltage (BI/RBO) IOH = Max
ICEX HIGH Level Output VCC = Max, VO = 30V
250 µA
Current (a thru g) VIL = Max, VIH = Min
VOL LOW Level VCC = Min, IOL = Max
0.3 0.4 V
Output Voltage VIH = Min, VIL = Max
II Input Current @ Max VCC = Max, VI = 5.5V
1 mA
Input Voltage (Except BI/RBO)
IIH HIGH Level Input VCC = Max, VI = 2.4V
40 µA

11. Current (Except BI/RBO)
IIL LOW Level Input VCC = Max BI/RBO −4
mA
Current VI = 0.4V Others −1.6
IOS Short Circuit VCC = Max −4 mA
Output Current (BI/RBO)
ICC Supply Current VCC = Max
60 103 mA
(Note 8)
Symbol Parameter Conditions Min Max Units
tPLH Propagation Delay Time CL = 15 pF
100 ns
LOW-to-HIGH Level Output RL = 120Ω
tPHL Propagation Delay Time
100 ns
HIGH-to-LOW Level Output
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DM7447A Electrical Characteristics
over recommended operating free air temperature range (unless
otherwise noted)
Note 9: All typicals are at VCC = 5V, TA = 25°C.
Note 10: ICC is measured with all outputs OPEN and all inputs
at 4.5V.
DM7447A Switching Characteristics
at VCC = 5V and TA = 25°C
Symbol Parameter Conditions Min
Typ
Max Units
(Note 9)
VI Input Clamp Voltage VCC = Min, II = −12 mA −1.5 V

13. VOH HIGH Level Output VCC = Min
2.4 3.7 V
Voltage (BI/RBO) IOH = Max
ICEX HIGH Level Output VCC = Max, VO = 15V
250 µA
Current (a thru g) VIL = Max, VIH = Min
VOL LOW Level Output VCC = Min, IOL = Max
0.3 0.4 V
Voltage VIH = Min, VIL = Max
II Input Current @ Max VCC = Max, VI = 5.5V 1 mA
Input Voltage
IIH HIGH Level Input Current VCC = Max, VI = 2.4V 40 µA
IIL LOW Level Input VCC = Max BI/RBO −4
mA
Current VI = 0.4V Others −1.6
IOS Short Circuit VCC = Max −4 mA
Output Current (BI/RBO)
ICC Supply Current VCC = Max 60 103
mA
(Note 10)
Symbol Parameter Conditions Min Max Units

14. tPLH Propagation Delay Time CL = 15 pF
100 ns
LOW-to-HIGH Level Output RL = 120Ω
tPHL Propagation Delay Time
100 ns
HIGH-to-LOW Level Output
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16. rs Physical Dimensions inches (millimeters) unless otherwise
noted
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001,
0.300" Wide
Package Number N16E
Fairchild does not assume any responsibility for use of any
circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change
said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR
USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN
APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com

17. BCD_7Seg_7447.ms14
Kmap grouping_Dont Cares.pdf
Lab4_BCD7Seg_INSTRUCTIONS.pdf
EET 271 – Winter 2018 NAME:
_________________________
Lab # 4: BCD to Seven-Segment Display
PART 1 - Software
Objectives:
1. Develop Karnaugh maps from given truth table
2. Determine simplified Boolean expressions for each display
segment
3. Simulate BCD to 7-segment display circuit via logic gates in
Multisim
Procedure:
BCD Inputs Seven Segment Outputs
Decimal A B C D a b c d e f g
0 0 0 0 0 1 1 1 1 1 1 0
1 0 0 0 1 0 1 1 0 0 0 0
2 0 0 1 0 1 1 0 1 1 0 1
3 0 0 1 1 1 1 1 1 0 0 1
4 0 1 0 0 0 1 1 0 0 1 1
5 0 1 0 1 1 0 1 1 0 1 1
6 0 1 1 0 1 0 1 1 1 1 1

18. 7 0 1 1 1 1 1 1 0 0 0 0
8 1 0 0 0 1 1 1 1 1 1 1
9 1 0 0 1 1 1 1 1 0 1 1
1. Using above Truth Table, fill out the Karnaugh maps for each
output segment, then simplify.
Segment a Segment b
Segment c Segment d
Segment e Segment f
Segment g
2. Simulate the AND-OR combinational logic circuit in
Multisim.
a. Multisim Tips and Tricks:
i. Vcc and Ground components are found in the “Sources” menu
ii. Switches (SPDT) are found in the “Basic” menu
iii. The logic gates (AND, OR, NOT) are found in the “TIL”

19. sub-menu in the “Misc
Digital” menu
iv. The 7-Segment Display (SEVEN_SEG_COM_K) can be
found in the “Indicators”
menu. NOTE: This is a “Common-Cathode display”. Refer to
datasheet.
v. Double-click on a component to change characteristics
(Labeling, control, etc)
vi. Right-click on a component for Rotation/Flip options
b. Refer to image below to help you get started:
3. Verify working circuit by comparing the decimal values
displayed on 7-segment display to BCD
input values. Do the input-output relationships match the truth
table?
4. Name and save your Multisim file using the following
convention: LASTNAME_Lab4
PART 2 - Hardware
Objectives:

20. 1. Understand datasheets for the 7447, 7-Segment Display, and
Resistor Pack ICs
2. Reference Multisim circuit in order to translate software to
hardware
3. Build physical circuit using NI ELVIS and Digital Writer
Procedure:
1. Open datasheets for the following ICs
a. 7447 – BCD to Seven Segment Decoder
b. LTS-312AHR – Seven Segment Display
i. NOTE: This is a “Common-Anode display” pay attention to
the differences
between this display and the type used in the simulation.
c. Image for the 470Ω Resistor Pack IC
2. Open the Multisim file attached to the Canvas assignment.
a. Click Run to begin simulation and confirm proper operation
3. Using the components supplied in the lab, construct the
circuit on NI ELVIS
a. Keep your wiring clean! It will be very difficult for you to
troubleshoot messy wiring.
b. You will utilize the Digital Writer in the ELVISmx
Instrument Launcher to control the BCD
input to the 7447
4. Demonstrate proper operation of your completed circuit to

21. the Instructor or TA.
a. Instructor/TA initials to signify working circuit:
_______________
5. Take a picture of your functioning circuit. Picture must show
circuit detail.
6. CLEAN UP YOUR WORKSTATION: Remove all wires and
ICs from the ELVIS unit and return to
their original locations. Take extra caution to not bend pins on
ICs
Lab Submission:
Submit your completed Multisim file from Part 1, AND picture
of your circuit from Part 2 to Canvas
by the due date. You will also submit this document to the
instructor.
Sedaris. Little, Brown and Company, 2000

22. img002img009img011img012
EET 271: Digital CircuitsWinter 2018
MAKE SURE TO UTILIZE HEADERS AND PAGE NUMBERS!
Lab Report Instructions
Reports should be approximately two pages in length, excluding
references. Always use “passive voice” when writing lab
reports. Never use first-person tense.
The bulleted list below describes the sections required in all lab
reports. Page 2 of this document provides some further
information regarding layout, structure and labeling of lab
reports. Page 3 shows the rubric utilized in the grading of
submitted reports.
The sections that are expected but not limited are:
· Abstract/Synopsis
· Introduction/Statement of Problem
· Theory/Objectives
· Method/Application
· Design discussion
· How you went about solving the problem and meeting
objectives
· Results/Findings
· Narrative of results
· Error Analysis (as needed)
· References

23. Lab Report Title
Laboratory # or Name
by
YOUR NAME HERE
The Abstract consists of a brief understanding of the laboratory
and the results that occurred. Any major deviations from the
normal should also be briefly mentioned in this section.
The Introduction restates the laboratory directives and expected
results. It should be well written, concise and include all
pertinent theories involved in said laboratory. The report should
be approximately 2 pages long excluding appendices.
The body of the paper should describe the methods of the
laboratory. It needs to include the devices used including:
· Hardware utilized, including part #s, and how
· Software utilized, and how
· …etc.
Pictures need to be labeled (see figure 1.) The image does not
have to be separated from the text top and bottom. It can exist
anywhere on the page where it is relevant to the information.
Results
Sections can have labels as long as there is a consistent
usage throughout the report. (e.g. This example is not
consistent, otherwise the introduction and methods section
would also have labels.)
Fig. 1: Branching of Circuits

24. Lab Report Grading Rubric:
Assessment Rubric
Pts
Does Not Meet Any Expectation
(0 Points)
Does Not Meet Expectations
(1 Point)
Meets Expectations
(2 points)
Exceeds Expectations
(3 Points)
Criterion 1: Abstract/Synopsis - Clear and concise
0
Criterion 2: Introduction/Statement of Problem - Sufficient
detail
0
Criterion 3: Method/Application - Each paragraph organized
with good detail
0

25. Criterion 4: Results/Findings - Accurate discussion of results
0
Criterion 5: References - included as assigned
0
Criterion 6: Report written in passive voice
0
Criterion 7: Proper length as assigned
0
2 | Page