Fairchild DM74LS283 4-bit binary adders with fast carry Datasheet

DM74LS283
4-Bit Binary Adders with Fast Carry
General Description
These full adders perform the addition of two 4-bit binary
numbers. The sum (∑) 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 accomplished without the need for logic or level inversion.
n Systems achieve partial look-ahead performance with
the economy of ripple carry
n Typical add times
Two 8-bit words 25 ns
Two 16-bit words 45 ns
n Typical power dissipation per 4-bit adder 95 mW
n Alternate Military/Aerospace device (54LS283) is
available. Contact a Fairchild Semiconductor Sales
Office/Distributor for specifications.
Features
n Full-carry look-ahead across the four bits
Connection Diagram
Dual-In-Line Package
DS006421-1
Order Number 54LS283DMQB, 54LS283FMQB, 54LS283LMQB,
DM54LS283J, DM54LS283W, DM74LS283M or DM74LS283N
See Package Number E20A, J16A, M16A, N16E or W16A
© 1998 Fairchild Semiconductor Corporation
DS006421
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DM74LS283 4-Bit Binary Adders with Fast Carry
March 1998
Absolute Maximum Ratings (Note 1)
Supply Voltage
Input Voltage
Operating Free Air Temperature Range
DM54LS and 54LS
DM74LS
Storage Temperature Range
7V
7V
−55˚C to +125˚C
0˚C to +70˚C
−65˚C to +150˚C
Recommended Operating Conditions
Symbol
Parameter
DM54LS283
DM74LS283
Units
Min
Nom
Max
Min
Nom
Max
4.5
5
5.5
4.75
5
5.25
VCC
Supply Voltage
VIH
High Level Input Voltage
VIL
Low Level Input Voltage
0.7
0.8
V
IOH
High Level Output Current
−0.4
−0.4
mA
IOL
Low Level Output Current
8
mA
TA
Free Air Operating Temperature
70
˚C
2
2
V
4
−55
125
V
0
Note 1: The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. 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.
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
−1.5
V
(Note 2)
VI
Input Clamp Voltage
VOH
High Level Output
Voltage
VOL
Low Level Output
Voltage
Input Current @ Max
II
Input Voltage
IIH
High Level Input
Current
IIL
Low Level Input
Current
IOS
Short Circuit
VCC = Min, II = −18 mA
VCC = Min, IOH =
Max
VIL = Max, VIH = Min
VCC = Min, IOL = Max
VIL = Max, VIH = Min
IOL = 4 mA, VCC =
Min
VCC = Max
Supply Current
ICC2
Supply Current
2.5
DM74
2.7
V
3.4
DM54
0.25
0.4
DM74
0.35
0.5
DM74
0.25
0.4
A, B
0.2
C0
0.1
A, B
40
VI = 2.7V
VCC = Max
C0
20
A, B
−0.8
VI = 0.4V
VCC = Max
C0
−0.4
DM54
−20
−100
DM74
−20
−100
VCC = Max (Note 4)
VCC = Max (Note 5)
Note 2: All typicals are at VCC = 5V, TA = 25˚C.
Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 4: ICC1 is measured with all outputs open, all B inputs low and all other inputs at 4.5V, or all inputs at 4.5V.
Note 5: ICC2 is measured with all outputs open and all inputs grounded.
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3.4
VI = 7V
VCC = Max
Output Current
ICC1
DM54
2
V
mA
µA
mA
mA
19
34
mA
22
39
mA
Switching Characteristics
at VCC = 5V and TA = 25˚C
RL = 2 kΩ
From (Input)
Symbol
Parameter
CL = 15 pF
To (Output)
Min
tPLH
Propagation Delay Time
Low to High Level Output
tPHL
Propagation Delay Time
High to Low Level Output
tPLH
Propagation Delay Time
Low to High Level Output
tPHL
Propagation Delay Time
High to Low Level Output
tPLH
Propagation Delay Time
Low to High Level Output
tPHL
Propagation Delay Time
High to Low Level Output
tPLH
Propagation Delay Time
Low to High Level Output
tPHL
tPLH
Propagation Delay Time
tPLH
C0 to
Propagation Delay Time
Propagation Delay Time
High to Low Level Output
24
28
ns
24
30
ns
24
28
ns
24
30
ns
24
28
ns
24
30
ns
24
28
ns
24
30
ns
17
24
ns
17
25
ns
17
24
ns
17
26
ns
∑3
C0 to
∑3
C0 to
∑4
C0 to
∑4
Ai or Bi
to ∑i
Ai or Bi
C0 to
Low to High Level Output
tPHL
C0 to
Propagation Delay Time
High to Low Level Output
Units
Max
∑ 1, ∑ 2
to ∑i
Propagation Delay Time
CL = 50 pF
Min
∑ 1, ∑ 2
High to Low Level Output
Low to High Level Output
tPHL
C0 to
Max
C4
C0 to
C4
Ai or Bi
to C4
Ai or Bi
to C4
3
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Function Table
DS006421-3
H = High Level, L = Low Level
Note 6: Input conditions at A1, B1, A2, B2, and C0 are used to determine outputs ∑ 1 and ∑2 and the value of the internal carry C2. The values at C2, A3, B3, A4,
and B4 are then used to determine outputs ∑3, ∑4, and C4.
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4
Logic Diagram
LS283
DS006421-2
5
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Physical Dimensions
inches (millimeters) unless otherwise noted
Ceramic Leadless Chip Carrier Package (E)
Order Number 54LS283LMQB
Package Number E20A
16-Lead Ceramic Dual-In-Line Package (J)
Order Number 54LS283DMQB or DM54LS283J
Package Number J16A
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6
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
16-Lead Small Outline Molded Package (M)
Order Number DM74LS283M
Package Number M16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS283N
Package Number N16E
7
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DM74LS283 4-Bit Binary Adders with Fast Carry
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
16-Lead Ceramic Flat Package (W)
Order Number 54LS283FMQB or DM54LS283W
Package Number W16A
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FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:
2. A critical component in any component of a life support
1. Life support devices or systems are devices or sysdevice or system whose failure to perform can be reatems which, (a) are intended for surgical implant into
sonably expected to cause the failure of the life support
the body, or (b) support or sustain life, and (c) whose
device or system, or to affect its safety or effectiveness.
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
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Tel: 1-888-522-5372
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