74LS283 [NSC]
4-Bit Binary Adders with Fast Carry; 4位二进制加法器与快速进
| 型号： | 74LS283 |
| 厂家： | 
National Semiconductor |
| 描述： | 4-Bit Binary Adders with Fast Carry |
| 文件： | 总8页 (文件大小：160K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
June 1989
54LS283/DM54LS283/DM74LS283
4-Bit Binary Adders with Fast Carry
General Description
Features
Y
Full-carry look-ahead across the four bits
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.
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
Y
Typical power dissipation per 4-bit adder 95 mW
Alternate Military/Aerospace device (54LS283) is avail-
able. Contact a National Semiconductor Sales Office/
Distributor for specifications.
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.
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
C
1995 National Semiconductor Corporation
TL/F/6421
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.
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.
Supply Voltage
Input Voltage
7V
7V
Operating Free Air Temperature Range
DM54LS and 54LS
DM74LS
b
b
a
a
55 C to 125 C
§
§
0 C to 70 C
§
§
a
65 C to 150 C
Storage Temperature Range
§
§
Recommended Operating Conditions
DM54LS283
DM74LS283
Symbol
Parameter
Units
Min
4.5
2
Nom
Max
Min
4.75
2
Nom
Max
V
V
V
Supply Voltage
5
5.5
5
5.25
V
V
CC
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
IH
0.7
0.8
V
IL
b
b
0.4
I
I
0.4
mA
mA
OH
OL
4
8
b
T
A
55
125
0
70
C
§
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Typ
Symbol
Parameter
Conditions
Min
Max
Units
(Note 1)
e
e
e b
e
b
1.5
V
V
Input Clamp Voltage
V
Min, I
Min, I
18 mA
V
V
I
CC
I
High Level Output
Voltage
V
V
Max
Min
DM54
DM74
DM54
DM74
DM74
A, B
2.5
2.7
3.4
3.4
OH
CC
OH
e
e
Max, V
IL
IH
e
e
e
V
OL
Low Level Output
Voltage
V
V
Min, I
Max
Min
0.25
0.35
0.25
0.4
CC
OL
e
Max, V
IH
IL
0.5
0.4
0.2
0.1
40
V
e
e
Min
I
4 mA, V
CC
OL
@
Input Current Max
e
CC
I
I
I
I
V
Max
I
mA
mA
mA
mA
e
Input Voltage
V
I
7V
C0
e
High Level Input
Current
V
V
Max
Max
Max
A, B
IH
IL
CC
e
2.7V
I
C0
20
e
b
Low Level Input
Current
V
V
A, B
0.8
0.4
CC
e
0.4V
I
b
C0
e
b
b
b
b
Short Circuit
V
CC
DM54
DM74
20
20
100
100
OS
Output Current
(Note 2)
e
e
I
I
Supply Current
Supply Current
V
V
Max (Note 3)
Max (Note 4)
19
22
34
39
mA
mA
CC1
CC2
CC
CC
e
e
25 C.
Note 1: All typicals are at V
5V, T
§
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
CC
A
Note 3: I
Note 4: I
is measured with all outputs open, all B inputs low and all other inputs at 4.5V, or all inputs at 4.5V.
is measured with all outputs open and all inputs grounded.
CC1
CC2
2
e
e
25 C (See Section 1 for Test Waveforms and Output Load)
Switching Characteristics at V
5V and T
§
CC
A
e
R
L
2 kX
From (Input)
To (Output)
e
e
L
Symbol
Parameter
C
L
15 pF
C
50 pF
Max
Units
Min
Max
Min
t
t
t
t
t
t
t
t
t
t
t
t
Propagation Delay Time
Low to High Level Output
C0 to
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
24
28
30
28
30
28
30
28
30
24
25
24
26
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
R1, R2
Propagation Delay Time
High to Low Level Output
C0 to
24
24
24
24
24
24
24
17
17
17
17
R1, R2
Propagation Delay Time
Low to High Level Output
C0 to
R3
Propagation Delay Time
High to Low Level Output
C0 to
R3
Propagation Delay Time
Low to High Level Output
C0 to
R4
Propagation Delay Time
High to Low Level Output
C0 to
R4
Propagation Delay Time
Low to High Level Output
A or B
i
i
to R
i
Propagation Delay Time
High to Low Level Output
A or B
i
i
to R
i
Propagation Delay Time
Low to High Level Output
C0 to
C4
Propagation Delay Time
High to Low Level Output
C0 to
C4
Propagation Delay Time
Low to High Level Output
A or B
i
i
to C4
Propagation Delay Time
High to Low Level Output
A or B
i
i
to C4
Function Table
TL/F/6421–3
e
e
Low Level
H
High Level, L
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
Physical Dimensions inches (millimeters) (Continued)
16-Lead Ceramic Flat Package (W)
Order Number 54LS283FMQB or DM54LS283W
NS Package Number W16A
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