ENCODER, DECODER dan SEVEN SEGMEN

YUSRON SUGIARTO

Dekoder

Dekoder adalah suatu rangkaian logika yang memiliki sedikit masukan dan banyak keluaran.

Dekoder

Dekoder

Dekoder

ENCODERS AND DECODERS

A 0

A 1

A 2

A 3

A 4

A 5

A 6

A 7

ENCODER

O 0

O 1

O 2

A 0

A 1

A 2

O 0

O 1

O 2

O 3

O 4

O 5

O 6

O 7

DECODER

ONLY ONE INPUT ACTIVATED AT A TIME

BINARY CODE OUTPUT

BINARY CODE INPUT

ONLY ONE OUTPUT ACTIVATED AT A TIME

THE 8421 BCD CODE• 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 4926 4 9 2 6

8421 BCD coded number 0100 1001 0010 0110

ELECTRONIC ENCODER - DECIMAL TO BCD

0

Decimalto

BCDEncoder

BCD output

Decimal input0 0 0 0

5

0 1 0 1

7

0 1 1 1

3

0 0 1 1

• Encoders are available in IC form.• This encoder translates from decimal

input to BCD output.

10 line to 4 line Encoder

ENCODER1248

DECIMAL BINARY (BCD)

9 5V

8 5V

7 5V

6 5V5 5V

4 5V3 5V

2 5V1 5V

74147I9I8I7I6I5I4I3I2I1

A0A1A2A3

10 line to 4 line Encoder

0

1

2

3

4

5

6

7

8

9

DECODER

BINARY (BCD)

DECIMAL

1 0V

2 0V

4 0V

8 0V

74LS42

A3A2A1A0

9876543210

4 line to 10 line Decoder

BCD-to-7-SegmentDecoder/

Driver

DECODERS: BCD TO 7-SEGMENT DECODER/DRIVERBCD input

0 0 0 00 0 0 0

Decimal outputLED

0 0 0 10 0 0 10 0 1 00 0 1 00 0 1 10 0 1 10 1 0 00 1 0 0

• 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.

BCD-to-7-SegmentDecoder/

Driver

BCD inputDecimal output

0 0 1 1

?

Q #1- What is the decimal output from the decoder that appears on the 7-segment display?

Answer: 3

Q #2- What is the decimal output from the decoder that appears on the 7-segment display?

0 0 0 0

Answer: 0

Q #3- What is the decimal output from the decoder that appears on the 7-segment display?

1 0 0 1

Answer: 9

Q #4- What is the decimal output from the decoder that appears on the 7-segment display?

Answer: 7

0 1 1 1

Q #5- What is the decimal output from the decoder that appears on the 7-segment display?

Answer: 6

0 1 1 0

TEST

BCD-TO-SEVEN SEGMENT DECODER DRIVER

5V

abcdef g .

V+

74LS47A3A2A1A0

testRBI

gfedcba

RBO

7-segmen display

Rangkaian Pengubah kode BCD ke LED 7-segmen