SN54F283 Datasheet, PDF (1/5 Pages) Texas Instruments – 4-BIT BINARY FULL ADDERS WITH FAST CARRY

• Full-Carry Look-Ahead Across the
Four Bits
• Systems Achieve Partial Look-Ahead
Performance With the Economy of Ripple
Carry
• Package Options Include Plastic
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
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.
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.
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.
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^†
SN54F283, SN74F283
4-BIT BINARY FULL ADDERS
WITH FAST CARRY
SDFS069A – D2932, MARCH 1987 – REVISED OCTOBER 1993
SN54F283 . . . J PACKAGE
SN74F283 . . . D OR N PACKAGE
(TOP VIEW)
Σ2 1
B2 2
A2 3
Σ1 4
A1 5
B1 6
C0 7
GND 8
16 V_CC
15 B3
14 A3
13 Σ3
12 A4
11 B4
10 Σ4
9 C4
SN54F283 . . . FK PACKAGE
(TOP VIEW)
A2
3 2 1 20 19
4
18
A3
Σ1 ₅
17 ^Σ3
NC 6
16 NC
A1 7
15 A4
B1 8
14 B4
9 10 11 12 13
NC – No internal connection
5
A1
3
A2
14
A3
12
A4
6
B1
2
B2
15
B3
11
B4
7
C0
Σ
0
0
P
Σ
3
0
3
Q
3
CO
CI
4
Σ1
1
Σ2
13
Σ3
10
Σ4
9
C4
† _{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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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Copyright © 1993, Texas Instruments Incorporated
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