Datasheet SN74ls283 Datasheet

4-BIT BINARY FULL ADDER WITH FAST CARRY

The SN54/74LS283 is a high-speed 4-Bit Binary Full Adder with internal carry lookahead. It accepts two 4-bit binary words (A1–A4, B1–B4) and a Carry Input (C0). It generates the binary Sum outputs (∑1–∑4) and the Carry Output (C4) from the most significant bit. The LS283 operates with either active HIGH or active LOW operands (positive or negative logic).

CONNECTION DIAGRAM DIP (TOP VIEW)

B3A

V

CC

16 15

123456

Σ

B2A

2

Σ3A

3

14 13 12 11 10 9

2

4

Σ1A1B1C0GND

Σ

B

4

7

C

4

NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package.

8

SN54/74LS283

4-BIT BINARY FULL ADDER

WITH FAST CARRY

LOW POWER SCHOTTKY

J SUFFIX

CERAMIC

16

1

16

1

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

PIN NAMES

A1–A B1–B C

0

∑1–∑

C

4

NOTES: a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW. b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial

(74) T emperature Ranges.

Operand A Inputs 1.0 U.L. 0.5 U.L.

4

Operand B Inputs 1.0 U.L. 0.5 U.L.

4

Carry Input 0.5 U.L. 0.25 U.L. Sum Outputs (Note b) 10 U.L. 5 (2.5) U.L.

4

Carry Output (Note b) 10 U.L. 5 (2.5) U.L.

LOADING (Note a)

HIGH

LOW

D SUFFIX

16

1

SOIC

CASE 751B-03

ORDERING INFORMATION

SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXD SOIC

LOGIC SYMBOL

5 3 14 12 6 2 15 11

A1A2A3A4B1B2B3B

C

0

∑1∑2∑3∑

4 1 13 10

VCC = PIN 16 GND = PIN 8

4 C

4

97

FAST AND LS TTL DAT A

5-1

LOGIC DIAGRAM

SN54/74LS283

C0A

B

1

5

A

B

2

267

3

C

1

A

B

3

14

C

2

15

A

B

4

12

11

C

3

VCC = PIN 16

4

∑

1

∑

2

13

∑

3

10

∑

4

GND = PIN 8

= PIN NUMBERS

FUNCTIONAL DESCRIPTION

The LS283 adds two 4-bit binary words (A plus B) plus the

incoming carry. The binary sum appears on the sum outputs (∑1–∑4) and outgoing carry (C4) outputs.

C0 + (A1 + B1) + 2(A2 + B2) + 4(A3 + B3) + 8(A4 + B4) = ∑1 + 2 ∑ + 4 ∑3 + 8 ∑4 + 16C

4

Where: (+) = plus

2

Due to the symmetry of the binary add function the LS283 can be used with either all inputs and outputs active HIGH (positive logic) or with all inputs and outputs active LOW (negative logic). Note that with active HIGH inputs, Carry Input can not be left open, but must be held LOW when no carry in is intended.

Example:

C0A1A2A3A4B1B2B3B4∑1∑2∑3∑4C

logic levels L L H L H H L L H H H L L H

Active HIGH 0 0 1 0 1 1 0 0 1 1 1 0 0 1 (10+9=19)

Active LOW 1 1 0 1 0 0 1 1 0 0 0 1 1 0 (carry+5+6=12)

Interchanging inputs of equal weight does not affect the operation, thus C0, A1, B1, can be arbitrarily assigned to pins 7, 5 or 3.

9

C

4

FAST AND LS TTL DATA

5-2

SN54/74LS283

VILI

LOW Volt

V

pg

VOHOutput HIGH Volt

CC

,

OH

,

IN IH

VOLOutput LOW Volt

V

MAX, V

V

IIHI

HIGH C

t

V

MAX, V

V

IILI

LOW C

t

V

MAX, V

V

CC

FUNCTIONAL TRUTH TABLE

C (n–1) A

L L L L L L L H H L L H L H L

L H H L H H L L H L H L H L H H H L L H H H H H H

C1–C3 are generated internally C0 is an external input C4 is an output generated internally

n

GUARANTEED OPERATING RANGES

Symbol Parameter Min Typ Max Unit

V

T

I

OH

I

OL

CC

A

Supply Voltage 54

Operating Ambient Temperature Range 54

Output Current — High 54, 74 –0.4 mA Output Current — Low 54

B

n

74

∑

n

4.5

4.75 –55

0

C

n

5.0

5.0 25

25

5.5

5.25 125

70

4.0

8.0

V

°C

mA

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits

Symbol Parameter

V

IH

V

IK

I

OS

I

CC

Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.

Input HIGH Voltage 2.0 V

nput

Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA

nput

Short Circuit Current (Note 1) –20 –100 mA VCC = MAX Power Supply Current

Total, Output HIGH Total, Output LOW 39

age

urren

54 74

54 2.5 3.5 V 74 2.7 3.5 V

54, 74 0.25 0.4 V IOL = 4.0 mA

74 0.35 0.5 V IOL = 8.0 mA

C

0

Any A or B 40 µA C

0

Any A or B 0.2 mA C

0

Any A or B –0.8 mA

Min Typ Max

0.7

0.8

20 µA

0.1 mA

–0.4 mA

34

Unit Test Conditions

Guaranteed Input HIGH Voltage for All Inputs

Guaranteed Input LOW Voltage for All Inputs

VCC = MIN, IOH = MAX, VIN = V or VIL per Truth Table

=

CC

=

CC

=

CC

mA VCC = MAX

VCC = VCC MIN,

=

IN

per Truth Table

= 2.7

IN

= 7.0

IN

= 0.4

IN

IH

or

IL

IH

FAST AND LS TTL DATA

5-3

SN54/74LS283

L

p

AC CHARACTERISTICS (T

Symbol Parameter

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

Propagation Delay, C0 Input to Any Σ Output

Propagation Delay, Any A or B Input to Σ Outputs

Propagation Delay, C0 Input to C4 Output

Propagation Delay, Any A or B Input to C4 Output

V

IN

V

OUT

A

1.3 V

= 25°C, VCC = 5.0 V)

Limits

Min Typ Max

16 15

15 15

11 11

11 12

Unit Test Conditions

24 24

17 22

17 17

ns

AC WAVEFORMS

1.3 V t

PLH

1.3 V

t

PHL

1.3 V

t

PLH

V

IN

OUT

Figure 1 Figure 2

CL = 15 pF

Figures 1 & 2

t

PHL

FAST AND LS TTL DATA

5-4