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參數(shù)資料
| 型號： | 933794860602 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 算術(shù)邏輯單元 |
| 英文描述： | F/FAST SERIES, 4-BIT ADDER/SUBTRACTOR, PDIP16 |
| 封裝： | 0.300 INCH, PLASTIC, SOT-38-4, DIP-16 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 97K |
| 代理商： | 933794860602 |
Philips Semiconductors
Product specification
74F283
4-bit binary full adder with fast carry
1989 Mar 03
4
Figure A shows how to make a 3-bit adder. Tying the operand inputs
of the fourth adder (A3, B3) Low makes
Σ3 dependent only on, and
equal to, the carry from the third adder. Using somewhat the same
principle, Figure B shows a way of dividing the 74F283 into a 2-bit
and a 1-bit adder. The third stage adder (A2, B2,
Σ2) is used as
means of getting a carry (C10) signal into the fourth stage adder (via
A2 and B2) and bringing out the carry from the second stage on
Σ2.
Note that as long as A2 and B2 are the same, whether High or Low,
they do not influence
Σ2. Similarly, when A2 and B2 are the same,
the carry into the third stage does not influence the carry out of the
third stage. Figure C shows a method of implementing a 5-input
encoder where the inputs are equally weighted. The outputs
Σ0, Σ1
and
Σ2 present a binary number of inputs I0–I4 that are true.
Figure D shows one method of implementing a 5-input majority gate.
When three or more of the inputs I0–I4 are true, the output M4 is
true.
APPLICATIONS
Σ1
Σ0
A0 B0 A1 B1 A2 B2 A3 B3
SF00856
Σ3
Σ2
CIN
COUT
L
C3
A.
3-bit Adder
Σ1
Σ0
A0 B0 A1 B1 A2 B2 A3 B3
Σ3
Σ2
CIN
COUT
B.
2-bit and 1-bit Adder
CIN
C11
A0 B0 A1 B1
C10
A10 B10
Σ1
Σ0
Σ10
C2
Σ1
Σ0
A0 B0 A1 B1 A2 B2 A3 B3
Σ3
Σ2
CIN
COUT
C.
5-input Encoder
Σ1
Σ0
A0 B0 A1 B1 A2 B2 A3 B3
Σ3
Σ2
CIN
COUT
D.
5-input Majority Gate
I0
I1
I2
I3
I4
20
21
22
I0
I1
I2
I3
I4
L
M4
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