Adders and Subtractors

1
Adders and Subtractors

• CEC

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Contents

• Binary Arithmetic.
• Half Adder.
• Full Adder.
• Half Subtractor.
• Full Subtractor.
• IC 7483 Pin Out.
• 4 Bit Binary Adder.
• BCD Adder.

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2 Bit Binary Addition
Inputs
Outputs

Remarks
A
B
Sum
Carry
0
0
-
0
0
-
1
1 1 1 0
0
0
1
-
0
0
1
1
1
Carry Generated
0
1
1
Carry
4
2 Bit Binary Subtraction
Inputs
Outputs

Remarks
A
B
Diff
Borrow
Borrow
0
0
-
0
0
1
Borrow Generated
1
0 - 1 1
0
1
1
-
0
0
1
1
1
-
0
1
0
5
3 Bit Binary Addition

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3 Bit Binary Subtraction

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Half Adder
XOR
AND
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Full Adder

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Full Adder
A
B
CN-1
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Half Subtractor
A
B
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Full Subtractor

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Full Subtractor
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4 Bit Adder
A4A3A2A1 4 bit input.
B4B3B2B1 4 bit input.

1
2
4
3
LSB
MSB
S4S3S2S1 Four Bit Sum, C4 Final carry
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Adder IC

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IC 7483 4 Bit Full Adder
Nibble B
Nibble A

Sum
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IC 7483 4 Bit Binary Adder

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IC 7483 4 Bit Full Adder

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4 Bit Adder/Subtractor using IC 7483

ADD/SUB 0 to add 1 to subtract
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Cascading IC 7483

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BCD Adder

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Doing the Experiment
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Digital IC Trainer Kit Front Panel

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Digital IC Trainer Kit Front Panel
LEDs for displaying output status (1/0)

Springs to connect chip output pins to LEDs using
wire pieces to display the status
Breadboard for assembling the circuit
Springs to connect chip input pins to the
switches using wire pieces.
Toggle Switches for applying inputs(0/1) to the
chip inputs
Vcc and GND
Monopulser for trigger pulse (clock pulse)
ON/OFF Switch
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Thank You