HIT HD74HC83 Datasheet
HD74HC83
4-Bit Binary Full Adder (with Fast Carry)
Description
This improved full adder performs the addition of two 4-bit binary numbers. The sum ( ) output are
provided for each bit and the resultant carry (C4) is obtained from the fourth bit.
This adder features full internal look ahead across all four bit generating the carry term in ten nanoseconds
typically.
This provides the system designer with partial look-ahead performance at the economy and reduced
package count of a ripple-carry implementation.
Features
• High Speed Operation: tpd (Ai or Bi to Zi) = 16 ns typ (CL = 50 pF)
• High Output Current: Fanout of 10 LSTTL Loads
• Wide Operating Voltage: VCC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
HD74HC83
Function Table
Outputs
Inputs When C
A1/A3B1/B
A2/A
3
B2/B
4
∑1/∑
4
LLLLLLLHLL
HLLLHLLLHL
LHLLHLLLHL
HHLLLHLHHL
LLHLLHLHHL
HL HLHHLLL H
LHHLHHL LL H
HHHLL L HHL H
LLLHLHLHHL
HLLHHHLLLH
LHLHHHLLLH
HHLHLLHHLH
LL HHL L HHL H
HL HHHL HL HH
LHHHHL HL HH
HHHHLHHHHH
H : High level
L : Low level
X : Irrelevant
Note: Input conditions at A
internal carry C
The value at C
, B1, A2, B2 and C0 are used to determine outputs ∑1 and ∑2 and the value of the
1
.
2
, A3, B3, A4 and B4 are than used to determine outputs ∑3, ∑4 and C
2
= L/When C2 = L When C0 = H/When C2 = H
0
∑2/∑
3
C2/C
4
∑1/∑
4
∑2/∑
3
4
4
C2/C
4
2
Pin Arrangement
A4
Σ3
HD74HC83
1
B4
2
Σ3
A4
Σ4
16
15
B4
Σ4
3
A3
4
B3
5
V
CC
6
Σ2
7
B2
8
A2
A3
B3
Σ2
B2
A2
(Top view)
Σ1
C4
C0
B1
A1
14
13
12
11
10
C4
C0
GND
B
1
A1
9
Σ1
3
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