


SDFS069A − D2932, MARCH 1987 − REVISED OCTOBER 1993
Copyright 1993, Texas Instruments Incorporated
2−1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
•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†
Σ
0
6
B1
0
5
A1 3
A2 14
A3
3
12
A4
2
B2 15
B3
3
11
B4
CI
7
C0
C4
9
CO
Σ1
4
01
13
10
3
Σ2
Σ3
Σ4
P
Q
Σ
†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.
SN54F283 ...J PACKAGE
SN74F283 ...D OR N PACKAGE
(TOP VIEW)
3212019
910111213
4
5
6
7
8
18
17
16
15
14
A3
Σ3
NC
A4
B4
A2
Σ1
NC
A1
B1
SN54F283 . . . FK PACKAGE
(TOP VIEW)
B2
Σ
NC
C4
4B3
C0
GND
NC
NC − No internal connection
VCC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Σ2
B2
A2
Σ1
A1
B1
C0
GND
VCC
B3
A3
Σ3
A4
B4
Σ4
C4
2
Σ
  !"#$ % &'!!($ #%  )'*+&#$ ,#$(-
!,'&$% &!" $ %)(&&#$% )(! $.( $(!"%  (/#% %$!'"($%
%$#,#!, 0#!!#$1- !,'&$ )!&(%%2 ,(% $ (&(%%#!+1 &+',(
$(%$2  #++ )#!#"($(!%-



SDFS069A − D2932, MARCH 1987 − REVISED OCTOBER 1993
2−2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
logic diagram (positive logic)
11
12
B4
A4
15
14
B3
A3
2
3
B2
A2
6
5
B1
A1
C0 7
Σ1
Σ2
Σ3
Σ4
C4
9
10
13
1
4
Pin numbers shown are for the D, J, and N packages.



SDFS069A − D2932, MARCH 1987 − REVISED OCTOBER 1993
2−3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
FUNCTION TABLE
OUTPUTS
INPUTS WHEN C0 = L WHEN C0 = H
INPUTS
WHEN C2 = L WHEN C2 = H
A1 B1 A2 B2 Σ1Σ2 C2 Σ1Σ2 C2
A3 B3 A4 B4 Σ3Σ4 C4 Σ3Σ4 C4
L L L L L L L H L L
H L L L H L L L H L
L H L L H L L L H L
H H L L L H L H H L
L L H L L H L H H L
H L H L H H L L L H
L H H L H H L L L H
H H H L L L H H L H
L L L H L H L H H L
H L L H H H L L L H
L H L H H H L L L H
H H L H L L H H L H
L L H H L L H H L H
H L H H H L H L H H
L H H H H L H L H H
H H H H L H H H H H
NOTE: Input conditions at A1, B1, A2, B2, and C0 are used to determine outputs Σ1
and Σ2 and the value of the internal carry C2. The values at C2, A3, B3, A4,
and B4 are then used to determine outputs Σ3, Σ4, and C4.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC −0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range (see Note 1) −1.2 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input current range −30 mA to 5 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high state −0.5 V to VCC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the low state 40 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range: SN54F283 −55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74F283 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range −65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: The input voltage ratings may be exceeded provided the input current ratings are observed.



SDFS069A − D2932, MARCH 1987 − REVISED OCTOBER 1993
2−4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
recommended operating conditions
SN54F283 SN74F283
UNIT
MIN NOM MAX MIN NOM MAX
UNIT
VCC Supply voltage 4.5 5 5.5 4.5 5 5.5 V
VIH High-level input voltage 2 2 V
VIL Low-level input voltage 0.8 0.8 V
IIK Input clamp current −18 −18 mA
IOH High-level output current −1 −1 mA
IOL Low-level output current 20 20 mA
TAOperating free-air temperature −55 125 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54F283 SN74F283
UNIT
PARAMETER
TEST CONDITIONS
MIN TYP†MAX MIN TYP†MAX
UNIT
VIK VCC = 4.5 V, II = −18 mA −1.2 −1.2 V
VOH
VCC = 4.5 V IOH = − 1 mA 2.5 3.4 2.5 3.4
V
VOH VCC = 4.75 V, IOH = − 1 mA 2.7 V
VOL VCC = 4.5 V IOL = 20 mA 0.3 0.5 0.3 0.5 V
IIVCC = 5.5 V, VI = 7 V 0.1 0.1 mA
IIH VCC = 5.5 V, VI = 2.7 V 20 20 µA
IIL
Any A or B
VCC = 5.5 V,
VI = 0.5 V
− 1.2 − 1.2
mA
IIL C0 VCC = 5.5 V, VI = 0.5 V − 0.6 − 0.6 mA
IOS‡VCC = 5.5 V, VO = 0 −60 −150 −60 −150 mA
ICC VCC = 5.5 V, VI = 4.5 V 36 55 36 55 mA
†All typical values are at VCC = 5 V, TA = 25°C.
‡Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.
switching characteristics (see Note 2)
PARAMETER FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
CL = 50 pF,
RL = 500 Ω,
TA = 25°C
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500Ω,
TA = MIN to MAX§UNIT
(INPUT)
(OUTPUT)
′F283 SN54F283 SN74F283
MIN TYP MAX MIN MAX MIN MAX
tPLH
C0
Σ
2.7 6.6 9.5 2.7 14 2.7 10.5
ns
tPHL C0 Σ3.2 6.6 9.5 3.2 14 3.2 10.5 ns
tPLH
A or B
Σ
3.2 6.6 9.5 3.2 14 3.2 10.5
ns
tPHL A or B Σ2.7 6.6 9.5 2.7 14 2.7 10.5 ns
tPLH
C0
C4
2.7 5.3 7.5 2.7 10.5 2.7 8.5
ns
tPHL C0 C4 2.2 5 7 2.2 10 2.2 8 ns
tPLH
A or B
C4
2.7 5.3 7.5 2.7 10.5 2.7 8.5
ns
tPHL
A or B
C4
2.2 4.9 7 2.2 10 2.2 8
ns
§For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 2: Load circuits and waveforms are shown in Section 1.
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