Half Adder
A
|
B
|
SUM
|
CARRY
|
0
|
0
|
0
|
0
|
0
|
1
|
1
|
0
|
1
|
0
|
1
|
0
|
1
|
1
|
0
|
1
|
FIGURE 3
Truth table and block diagram for a Half Adder circuit.
The basic
difference between half and full adder is that a half adder has only two
inputs. Therefore a half adder cannot recognize a carry input. However,
both half and full adders generate a SUM and a CARRY output.
FIGURE 4
Circuitry for a half adder.
The 74LS83 4 bit parallel
adder chip.
The 74LS83
4 bit parallel adder chip. The 74LS83 is a 4 bit parallel adder IC chip.
This MSI chip can add two 4 bit binary numbers (A4A3A2A1 and B4B3B2B1)
together. The adder chip outputs a 5 bit sum (C4E4E3E2E1). There is also
a carry input (CO) available that ca be used to connect multiple 74LS83
chips together for larger adder applications.
FIGURE 5
74LS83 4 bit parallel adder chip.
