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ENCODER, DECODER dan SEVEN SEGMEN YUSRON SUGIARTO
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
