ꢀꢁ ꢂꢃ ꢄ ꢅ ꢆ ꢇ ꢈꢉ ꢀ ꢁꢊ ꢃꢄꢅ ꢆꢇ
ꢃ ꢋꢌꢍ ꢎꢉ ꢌꢍꢁ ꢏꢐꢑꢉꢄ ꢒꢓ ꢓꢉꢏ ꢔꢔ ꢕꢐ ꢀ
ꢖ ꢍꢎ ꢗꢉ ꢄꢏꢀꢎ ꢉꢘ ꢏ ꢐꢐꢑ
SDFS069A − D2932, MARCH 1987 − REVISED OCTOBER 1993
SN54F283 . . . J PACKAGE
SN74F283 . . . D OR N PACKAGE
(TOP VIEW)
• Full-Carry Look-Ahead Across the
Four Bits
• Systems Achieve Partial Look-Ahead
Performance With the Economy of Ripple
Carry
V
Σ2
B2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CC
B3
A3
Σ3
A4
B4
Σ4
C4
• Package Options Include Plastic
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
A2
Σ1
A1
B1
C0
GND
description
The ′F283 is a full adder that performs the addition
of two 4-bit binary words. The sum (Σ) outputs are
provided for each bit and the resultant carry (C4)
output is obtained from the fourth bit.
SN54F283 . . . FK PACKAGE
(TOP VIEW)
The device features full internal look-ahead
across all four bits generating the carry term C4 in
typically 5.7 ns. This capability provides the
system designer with partial look-ahead
performance at the economy and reduced
package count of a ripple-carry implementation.
3
2
1
20 19
18
A3
Σ3
NC
A4
B4
A2
Σ1
NC
A1
B1
4
5
6
7
8
17
16
15
14
The adder logic, including the carry, is
implemented in its true form. End-around carry
can be accomplished without the need for logic or
level inversion.
9 10 11 12 13
NC − No internal connection
The ′F283 can be used with either all-active-high
(positive logic) or all-active-low (negative logic)
operands.
The SN54F283 is characterized for operation over
the full military temperature range of −55°C to
125°C. The SN74F283 is characterized for
operation from 0°C to 70°C.
†
logic symbol
Σ
5
A1
A2
A3
A4
B1
B2
B3
B4
C0
0
4
Σ1
1
Σ2
13
Σ3
10
Σ4
3
0
14
12
6
P
Σ
3
0
3
2
Q
15
11
7
9
CO
C4
3
CI
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the D, J, and N packages.
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Copyright 1993, Texas Instruments Incorporated
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ꢢ ꢦ ꢣ ꢢꢛ ꢜꢰ ꢞꢝ ꢡ ꢩꢩ ꢧꢡ ꢟ ꢡ ꢠ ꢦ ꢢ ꢦ ꢟ ꢣ ꢫ
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2−1
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