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 SN54F283, SN74F283

 4-BIT BINARY FULL ADDERS

 WITH FAST CARRY

 SDFS069A – D2932, MARCH 1987 – REVISED OCTOBER 1993

Copyright 

©

 1993, Texas Instruments Incorporated

2–1

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

Full-Carry Look-Ahead Across the

Four Bits

Systems Achieve Partial Look-Ahead

Performance With the Economy of Ripple

Carry

Package Options Include Plastic

Small-Outline Packages, Ceramic Chip

Carriers, and Standard Plastic and Ceramic

300-mil DIPs

     

description

The 

F283 is a full adder that performs the addition

of two 4-bit binary words. The sum (

Σ

) outputs are

provided for each bit and the resultant carry (C4)

output is obtained from the fourth bit.

The device features full internal look-ahead

across all four bits generating the carry term C4 in

typically 5.7 ns. This capability 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. End-around carry

can be accomplished without the need for logic or

level inversion.

The 

F283 can be used with either all-active-high

(positive logic) or all-active-low (negative logic)

operands.

The SN54F283 is characterized for operation over

the full military temperature range of – 55

°

C to

125

°

C. The SN74F283 is characterized for

operation from 0

°

C to 70

°

C.

logic symbol

Σ

0

6

B1

0

5

A1

3

A2

14

A3

3

12

A4

2

B2

15

B3

3

11

B4

CI

7

C0

C4

9

CO

Σ

1

4

0

1

13

10

3

Σ

2

Σ

3

Σ

4

P

Q

Σ

† This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

Pin numbers shown are for the D, J, and N packages.

SN54F283 . . . J  PACKAGE

SN74F283 . . . D  OR  N  PACKAGE

(TOP VIEW)

3

2

1 20 19

9 10 11 12 13

4

5

6

7

8

18

17

16

15

14

A3

Σ

3

NC

A4

B4

A2

Σ

1

NC

A1

B1

SN54F283 . . . FK PACKAGE

(TOP VIEW)

B2

Σ

NC

C4

4

B3

C0

GND

NC

NC – No internal connection

V

CC

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

Σ

2

B2

A2

Σ

1

A1

B1

C0

GND

V

CC

B3

A3

Σ

3

A4

B4

Σ

4

C4

2

Σ

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

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SN54F283, SN74F283

4-BIT BINARY FULL ADDERS

WITH FAST CARRY

SDFS069A – D2932, MARCH 1987 – REVISED OCTOBER 1993

2–2

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

logic diagram (positive logic)

11

12

B4

A4

15

14

B3

A3

2

3

B2

A2

6

5

B1

A1

C0

7

Σ

1

Σ

2

Σ

3

Σ

4

C4

9

10

13

1

4

Pin numbers shown are for the D, J, and N packages.

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 SN54F283, SN74F283

 4-BIT BINARY FULL ADDERS

 WITH FAST CARRY

 SDFS069A – D2932, MARCH 1987 – REVISED OCTOBER 1993

2–3

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

FUNCTION TABLE

OUTPUTS

INPUTS

WHEN C0 = L

WHEN C0 = H

WHEN C2 = L

WHEN C2 = H

A1

B1

A2

B2

Σ

1

Σ

2

C2

Σ

1

Σ

2

C2

A3

B3

A4

B4

Σ

3

Σ

4

C4

Σ

3

Σ

4

C4

L

L

L

L

L

L

L

H

L

L

H

L

L

L

H

L

L

L

H

L

L

H

L

L

H

L

L

L

H

L

H

H

L

L

L

H

L

H

H

L

L

L

H

L

L

H

L

H

H

L

H

L

H

L

H

H

L

L

L

H

L

H

H

L

H

H

L

L

L

H

H

H

H

L

L

L

H

H

L

H

L

L

L

H

L

H

L

H

H

L

H

L

L

H

H

H

L

L

L

H

L

H

L

H

H

H

L

L

L

H

H

H

L

H

L

L

H

H

L

H

L

L

H

H

L

L

H

H

L

H

H

L

H

H

H

L

H

L

H

H

L

H

H

H

H

L

H

L

H

H

H

H

H

H

L

H

H

H

H

H

NOTE: Input conditions at A1, B1, A2, B2, and C0 are used to determine outputs 

Σ

1

and 

Σ

2 and the value of the internal carry C2. The values at C2, A3, B3, A4,

and B4 are then used to determine outputs 

Σ

3, 

Σ

4, and C4.

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage range, V

CC

 

 – 0.5 V to 7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Input voltage range (see Note 1) 

 – 1.2 V to 7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Input current range 

 – 30 mA to 5 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Voltage range applied to any output in the high state 

 – 0.5 V to V

CC

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Current into any output in the low state

40 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Operating free-air temperature range: SN54F283 

 – 55

°

C to 125

°

C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

SN74F283  

0

°

C to 70

°

C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Storage temperature range 

 – 65

°

C to 150

°

C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: The input voltage ratings may be exceeded provided the input current ratings are observed.

background image

SN54F283, SN74F283

4-BIT BINARY FULL ADDERS

WITH FAST CARRY

SDFS069A – D2932, MARCH 1987 – REVISED OCTOBER 1993

2–4

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

recommended operating conditions

SN54F283

SN74F283

UNIT

MIN

NOM

MAX

MIN

NOM

MAX

UNIT

VCC

Supply voltage

4.5

5

5.5

4.5

5

5.5

V

VIH

High-level input voltage

2

2

V

VIL

Low-level input voltage

0.8

0.8

V

IIK

Input clamp current

– 18

– 18

mA

IOH

High-level output current

– 1

– 1

mA

IOL

Low-level output current

20

20

mA

TA

Operating free-air temperature

– 55

125

0

70

°

C

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

SN54F283

SN74F283

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

TYP†

MAX

UNIT

VIK

VCC = 4.5 V,

II = – 18 mA

– 1.2

– 1.2

V

VOH

VCC = 4.5 V

IOH = – 1 mA

2.5

3.4

2.5

3.4

V

VOH

VCC = 4.75 V,

IOH = – 1 mA

2.7

V

VOL

VCC = 4.5 V

IOL = 20 mA

0.3

0.5

0.3

0.5

V

II

VCC = 5.5 V,

VI = 7 V

0.1

0.1

mA

IIH

VCC = 5.5 V,

VI = 2.7 V

20

20

µ

A

IIL

Any A or B

VCC = 5 5 V

VI = 0 5 V

– 1.2

– 1.2

mA

IIL

C0

VCC = 5.5 V,

VI = 0.5 V

– 0.6

– 0.6

mA

IOS‡

VCC = 5.5 V,

VO = 0

– 60

–150

– 60

–150

mA

ICC

VCC = 5.5 V,

VI = 4.5 V

36

55

36

55

mA

† All typical values are at VCC = 5 V, TA = 25

°

C.

‡ Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.

switching characteristics (see Note 2)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 5 V,

CL = 50 pF,

RL = 500 

,

TA = 25

°

C

VCC = 4.5 V to 5.5 V,

CL = 50 pF,

RL = 500

,

TA = MIN to MAX§

UNIT

(INPUT)

(OUTPUT)

F283

SN54F283

SN74F283

MIN

TYP

MAX

MIN

MAX

MIN

MAX

tPLH

C0

Σ

2.7

6.6

9.5

2.7

14

2.7

10.5

ns

tPHL

C0

Σ

3.2

6.6

9.5

3.2

14

3.2

10.5

ns

tPLH

A or B

Σ

3.2

6.6

9.5

3.2

14

3.2

10.5

ns

tPHL

A or B

Σ

2.7

6.6

9.5

2.7

14

2.7

10.5

ns

tPLH

C0

C4

2.7

5.3

7.5

2.7

10.5

2.7

8.5

ns

tPHL

C0

C4

2.2

5

7

2.2

10

2.2

8

ns

tPLH

A or B

C4

2.7

5.3

7.5

2.7

10.5

2.7

8.5

ns

tPHL

A or B

C4

2.2

4.9

7

2.2

10

2.2

8

ns

§ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

NOTE 2: Load circuits and waveforms are shown in Section 1.

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Copyright 

©

 1998, Texas Instruments Incorporated