© 2000 Fairchild Semiconductor Corporation DS006421 www .fairchildsemi.com
August 1986
Revised March 2000
DM74LS283 4-Bit Binary Adder with Fast Carry
DM74LS283
4-Bit Binary Adder with Fast Carry
General Descript ion
These full adders perform the addition of two 4-bit binary
numbers. The sum (∑) outputs are provided for each bit
and the r esult ant car ry (C4 ) is obt aine d from the f ourth bit.
These adders feature full internal look ahead across all four
bits. This provides the system designer with partial look-
ahead per formance at the eco nomy and reduced packa ge
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.
Features
■Full-carry look-ahead across the four bits
■Systems achieve partial look-ahead performance with
the economy of ripp le carry
■Typical add times
Two 8-bit words 25 ns
Two 16-bit words 45 ns
■Typical pow er di ssipation per 4-bit adder 95 mW
Ordering Code:
Devices also available in Tape and R eel. Spe ci fy by append ing the suffix let t er “X” to the orderin g c ode.
Connection Diagram
Order Number Package Number Package Description
DM74LS283M M16A 16-Lead Small Outline Integrated Circuit (SOIC), J EDEC MS -012, 0.150 Narrow
DM74LS283N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
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DM74LS283
Function Table
H = HIGH Level, L = LOW Level
Inpu t conditio ns at A1, B1, A2 , B 2, and C0 are us ed to dete rm ine output s ∑1 and ∑2 and th e v alue of the in t ernal car ry C 2.
The values a t C2, A3, B3, A4 , and B4 are t hen used to determine output s ∑3, ∑4, and C4.
Logic Diagram
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DM74LS283
Absolute Maximum Ratings(Note 1) Note 1: The “Abso lute Maximum Ratings” ar e those value s 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 tables are not guaranteed at the absolute maximum ratings.
The “Re comm ended Operat ing Co ndition s” table will de fine the cond itions
for actu al device operation.
Recommended Operating Conditions
Electri cal Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 2: All typicals are at VCC = 5V, TA = 25°C.
Note 3: N ot m ore than one output sh ould be sh orted at a tim e, and the duration sh ould not ex c eed one sec ond.
Note 4: ICC1 is measur ed w it h all outp ut s OPEN, al l B inputs LOW and all other in puts at 4.5 V, or all inputs at 4.5 V.
Note 5: ICC2 is measured with all outputs OPEN and all inputs GROUNDED.
Supply Voltage 7V
Input Voltage 7V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range −65°C to +150°C
Symbol Parameter Min Nom Max Units
VCC Supply Voltage 4.75 5 5.25 V
VIH HIGH Level Input Voltage 2 V
VIL LOW Level I nput Voltage 0.8 V
IOH HIGH Level Output Current −0.4 mA
IOL LOW Level Output Current 8 mA
TAFree Air Op erating Temperature 0 70 °C
Symbol Parameter Conditions Min Typ Max Units
(Note 2)
VIInput Clamp Voltage V CC = Min, II = −18 mA −1.5 V
VOH HIGH Level VCC = Min, IOH = Max 2.7 3.4 V
Output Voltage VIL = Max, VIH = Min
VOL LOW Level VCC = Min, IOL = Max 0.35 0.5
Output Voltage VIL = Max, VIH = Min V
IOL = 4 mA, VCC = Min 0.25 0.4
IIInput Current @ Max VCC = Max A, B 0.2 mA
Input V oltag e VI = 7V C0 0.1
IIH HIGH Level VCC = Max A, B 40 µA
Input Current VI = 2.7V C0 20
IIL LOW Level VCC = Max A, B −0.8 mA
Input Current VI = 0.4V C0 −0.4
IOS Short Circuit Output Current VCC = Max −20 −100 mA
ICC1 Supply Cur rent VCC = Max (Note 4) 19 34 mA
ICC2 Supply Cur rent VCC = Max (Note 5) 22 39 mA
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DM74LS283
Switching Characteri stics
at VCC = 5V and TA = 25°C From (Input) RL = 2 kΩ
Symbol Parameter To (Ou tpu t) CL = 15 pF CL = 50 pF Units
MinMaxMinMax
tPLH Propagation Delay Time C0 to ∑1, ∑22428ns
LOW-to-HIGH Level Output
tPHL Propagation Delay Time C0 to ∑1, ∑22430ns
HIGH-to-LOW Level Output
tPLH Propagation Delay Time C0 to ∑32428ns
LOW-to-HIGH Level Output
tPHL Propagation Delay Time C0 to ∑32430ns
HIGH-to-LOW Level Output
tPLH Propagation Delay Time C0 to ∑42428ns
LOW-to-HIGH Level Output
tPHL Propagation Delay Time C0 to ∑42430ns
HIGH-to-LOW Level Output
tPLH Propagation Delay Time Ai or Bi to ∑i24 28 ns
LOW-to-HIGH Level Output
tPHL Propagation Delay Time Ai or Bi to ∑i24 30 ns
HIGH-to-LOW Level Output
tPLH Propagation Delay Time C0 to C4 17 24 ns
LOW-to-HIGH Level Output
tPHL Propagation Delay Time C0 to C4 17 25 ns
HIGH-to-LOW Level Output
tPLH Propagation Delay Time Ai or Bi to C4 17 24 ns
LOW-to-HIGH Level Output
tPHL Propagation Delay Time Ai or Bi to C4 17 26 ns
HIGH-to-LOW Level Output
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DM74LS283
Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
Package Number M16A
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DM74LS283 4-Bit Binary Adder with Fast Carry
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N16E
Fairchild does no t assume any responsibility for use of any circuitry de scribed, no circuit patent licenses are imp lied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
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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:
1. Life suppor t de vices o r systems a re devices or syste ms
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical compon ent i n any compon ent of a life su pport
device or system whose failure to perform can be rea-
sonabl y ex pect ed to ca use the fa i lure of the life su pp ort
device or system, or to affect its safety or effectiveness.
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