1. Electronics Technology Seven-Segment Displays
Digital Electronics
Electronics Technology
Landon Johnson
Encoding, Decoding, and
Seven-Segment Displays

2. Encoder/Decoder Competencies
52. Given four different input combinations to a 10 line to 4 line encoder, the student will state the output combinations with 100% accuracy.
53. Given four different input combinations for a 4 line to 10 line decoder, the student will state the output combinations with 100% accuracy.

3. Encoder/Decoder Vocabulary
ENCODER- a digital circuit that produces a binary output code depending on which of its inputs are activated.
DECODER- a digital circuit that converts an input binary code into a single numeric output.

4. ENCODERS AND DECODERS ONLY ONE INPUT ACTIVATED AT A TIME
BINARY CODE INPUT
ONLY ONE OUTPUT ACTIVATED AT A TIME
BINARY CODE OUTPUT

5. THE 8421 BCD CODE Decimal number 4926 4 9 2 6
BCD stands for Binary-Coded Decimal.
A BCD number is a four-bit binary group that represents one of the ten decimal digits 0 through 9.
Example:
Decimal number
8421 BCD coded number

6. ELECTRONIC ENCODER - DECIMAL TO BCD
BCD output
Decimal input
Decimal to
BCD
Encoder 3 7 5
Encoders are available in IC form.
This encoder translates from decimal input to BCD output.

7. 10 line to 4 line Encoder

9. 10 line to 4 line Encoder

11. 4 line to 10 line Decoder

12. 7-SEGMENT DECODER/DRIVER
DECODERS: BCD TO
7-SEGMENT DECODER/DRIVER
BCD input
Decimal output
LED
BCD-to-
7-Segment
Decoder/
Driver
Electronic decoders are available in IC form.
This decoder translates from BCD to decimal.
Decimals are shown on an 7-segment LED display.
This IC also drives the 7-segment LED display.

13. ? TEST Answer: 9 Answer: 7 Answer: 6 Answer: 0 Answer: 3 0 1 1 1
Q #1- What is the decimal output from the decoder that
appears on the 7-segment display?
Q #4- What is the decimal output from the decoder that
appears on the 7-segment display?
Q #3- What is the decimal output from the decoder that
appears on the 7-segment display?
Q #5- What is the decimal output from the decoder that
appears on the 7-segment display?
Q #2- What is the decimal output from the decoder that
appears on the 7-segment display?
Answer: 9
Answer: 7
Answer: 6
Answer: 0
Answer: 3
BCD input
Decimal output
BCD-to-
7-Segment
Decoder/
Driver ?

16. TEST

17. TEST

18. TEST
ANSWER THE FOLLOWING QUESTIONS WITH ONE OR MORE OF THESE WORDS: MUX, DEMUX, ENCODER, DECODER.
A. Has more inputs than outputs.
ENCODER, MUX
B. Uses select inputs.
MUX, DEMUX
C. Can be used in parallel-to-serial conversion.
MUX
D. Produces a binary code at its output.
ENCODER
E. Only one of its outputs is activated at one time.
DEMUX, DECODER
F. Used to route input signals to one of several outputs.
MUX
G. Used to generate arbitrary logic functions.
MUX, DEMUX
H. 3 line-to-8 line or binary to octal.
DECODER
I. Data Selectors are also
MUX.