1. System Digital
Encoder, Decoder, and
Contoh Penerapanya

2. 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.

3. ENCODERS AND DECODERS Hanya Satu masukan yang aktif pada satu waktu
Masukan berupa kode biner
Keluaran berupa kode biner
Hanya satu keluaran yang aktif pada satu waktu

4. The truth table of 2-to-4 Decoder

5. 2-to-4 Decoder

6. 2-to-4 Decoder

7. The truth table of 3-to-8 Decoder1

8. 3-to-8 Decoder

9. 3-to-8 Decoder with Enable

10. 2-to-4 Decoder: NAND implementation
Decoder is enabled when E=0 and an output is active if it is 0

11. 2-4 Decoder with 2-input and Enable

12. Decoder Expansion Decoder expansion
Combine two or more small decoders with enable inputs to form a larger decoder
3-to-8-line decoder constructed from two 2-to-4-line decoders
The MSB is connected to the enable inputs
if A2=0, upper is enabled; if A2=1, lower is enabled.

13. Decoder Expansion

14. Combining two 2-4 decoders to form one 3-8 decoder using enable switch
The highest bit is used for the enables

15. 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

16. 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.

17. 10 line to 4 line Encoder

19. 10 line to 4 line Encoder

21. 4 line to 10 line Decoder

22. 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.

23. ? TEST 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 ?

26. TEST

27. TEST

28. 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.