DM74LS283MX - Fairchild Semiconductor

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.