TL F 6421
54LS283DM54LS283DM74LS283
4-Bit
Binary
Adders
with
Fast
Carry
June 1989
54LS283 DM54LS283 DM74LS283
4-Bit Binary Adders with Fast Carry
General Description
These full adders perform the addition of two 4-bit binary
numbers The sum (R) outputs are provided for each bit and
the resultant carry (C4) is obtained from the fourth bit
These adders feature full internal look ahead across all four
bits This 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 meaning that the end-around carry can be accom-
plished without the need for logic or level inversion
Features
Y
Full-carry look-ahead across the four bits
Y
Systems achieve partial look-ahead performance with
the economy of ripple carry
Y
Typical add times
Two 8-bit words 25 ns
Two 16-bit words 45 ns
Y
Typical power dissipation per 4-bit adder 95 mW
Y
Alternate Military Aerospace device (54LS283) is avail-
able Contact a National Semiconductor Sales Office
Distributor for specifications
Connection Diagram
Dual-In-Line Package
TL F 6421 1
Order Number 54LS283DMQB 54LS283FMQB 54LS283LMQB
DM54LS283J DM54LS283W DM74LS283M or DM74LS283N
See NS Package Number E20A J16A M16A N16E or W16A
C1995 National Semiconductor Corporation
RRD-B30M105 Printed in U S A
Absolute Maximum Ratings
(Note)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
DM54LS and 54LS
b
55 C to
a
125 C
DM74LS
0 C to
a
70 C
Storage Temperature Range
b
65 C to
a
150 C
Note
The ``Absolute Maximum Ratings'' are those values
beyond which the safety of the device cannot be guaran-
teed The device should not be operated at these limits The
parametric values defined in the ``Electrical Characteristics''
table are not guaranteed at the absolute maximum ratings
The ``Recommended Operating Conditions'' table will define
the conditions for actual device operation
Recommended Operating Conditions
Symbol
Parameter
DM54LS283
DM74LS283
Units
Min
Nom
Max
Min
Nom
Max
V
CC
Supply Voltage
4 5
5
5 5
4 75
5
5 25
V
V
IH
High Level Input Voltage
2
2
V
V
IL
Low Level Input Voltage
0 7
0 8
V
I
OH
High Level Output Current
b
0 4
b
0 4
mA
I
OL
Low Level Output Current
4
8
mA
T
A
Free Air Operating Temperature
b
55
125
0
70
C
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 1)
V
I
Input Clamp Voltage
V
CC
e
Min I
I
e b
18 mA
b
1 5
V
V
OH
High Level Output
V
CC
e
Min I
OH
e
Max
DM54
2 5
3 4
V
Voltage
V
IL
e
Max V
IH
e
Min
DM74
2 7
3 4
V
OL
Low Level Output
V
CC
e
Min I
OL
e
Max
DM54
0 25
0 4
Voltage
V
IL
e
Max V
IH
e
Min
DM74
0 35
0 5
V
I
OL
e
4 mA V
CC
e
Min
DM74
0 25
0 4
I
I
Input Current
Max
V
CC
e
Max
A B
0 2
mA
Input Voltage
V
I
e
7V
C0
0 1
I
IH
High Level Input
V
CC
e
Max
A B
40
m
A
Current
V
I
e
2 7V
C0
20
I
IL
Low Level Input
V
CC
e
Max
A B
b
0 8
mA
Current
V
I
e
0 4V
C0
b
0 4
I
OS
Short Circuit
V
CC
e
Max
DM54
b
20
b
100
mA
Output Current
(Note 2)
DM74
b
20
b
100
I
CC1
Supply Current
V
CC
e
Max (Note 3)
19
34
mA
I
CC2
Supply Current
V
CC
e
Max (Note 4)
22
39
mA
Note 1
All typicals are at V
CC
e
5V T
A
e
25 C
Note 2
Not more than one output should be shorted at a time and the duration should not exceed one second
Note 3
I
CC1
is measured with all outputs open all B inputs low and all other inputs at 4 5V or all inputs at 4 5V
Note 4
I
CC2
is measured with all outputs open and all inputs grounded
2
Switching Characteristics
at V
CC
e
5V and T
A
e
25 C (See Section 1 for Test Waveforms and Output Load)
From (Input)
R
L
e
2 kX
Symbol
Parameter
To (Output)
C
L
e
15 pF
C
L
e
50 pF
Units
Min
Max
Min
Max
t
PLH
Propagation Delay Time
C0 to
24
28
ns
Low to High Level Output
R
1 R2
t
PHL
Propagation Delay Time
C0 to
24
30
ns
High to Low Level Output
R
1 R2
t
PLH
Propagation Delay Time
C0 to
24
28
ns
Low to High Level Output
R
3
t
PHL
Propagation Delay Time
C0 to
24
30
ns
High to Low Level Output
R
3
t
PLH
Propagation Delay Time
C0 to
24
28
ns
Low to High Level Output
R
4
t
PHL
Propagation Delay Time
C0 to
24
30
ns
High to Low Level Output
R
4
t
PLH
Propagation Delay Time
A
i
or B
i
24
28
ns
Low to High Level Output
to R
i
t
PHL
Propagation Delay Time
A
i
or B
i
24
30
ns
High to Low Level Output
to R
i
t
PLH
Propagation Delay Time
C0 to
17
24
ns
Low to High Level Output
C4
t
PHL
Propagation Delay Time
C0 to
17
25
ns
High to Low Level Output
C4
t
PLH
Propagation Delay Time
A
i
or B
i
17
24
ns
Low to High Level Output
to C4
t
PHL
Propagation Delay Time
A
i
or B
i
17
26
ns
High to Low Level Output
to C4
Function Table
TL F 6421 3
H
e
High Level L
e
Low Level
Note
Input conditions at A1 B1 A2 B2 and C0 are used to determine outputs R1 and R2 and the value of the internal carry C2 The values at C2 A3 B3 A4 and
B4 are then used to determine outputs R3 R4 and C4
3
Logic Diagram
LS283
TL F 6421 2
4
5
Physical Dimensions
inches (millimeters)
Ceramic Leadless Chip Carrier Package (E)
Order Number 54LS283LMQB
NS Package Number E20A
16-Lead Ceramic Dual-In-Line Package (J)
Order Number 54LS283DMQB or DM54LS283J
NS Package Number J16A
6
Physical Dimensions
inches (millimeters) (Continued)
16-Lead Small Outline Molded Package (M)
Order Number DM74LS283M
NS Package Number M16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS283N
NS Package Number N16E
7
54LS283DM54LS283DM74LS283
4-Bit
Binary
Adders
with
Fast
Carry
Physical Dimensions
inches (millimeters) (Continued)
16-Lead Ceramic Flat Package (W)
Order Number 54LS283FMQB or DM54LS283W
NS Package Number W16A
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failure to perform when properly used in accordance
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with instructions for use provided in the labeling can
effectiveness
be reasonably expected to result in a significant injury
to the user
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