SN74LS283MEL データシートの表示（PDF） - ON Semiconductor

部品番号

コンポーネント説明

メーカー

SN74LS283MEL

4-Bit Binary Full Adder with Fast Carry

ON Semiconductor 

C0 A1

7

5

B1

6

A2

3

B2

2

SN74LS283

LOGIC DIAGRAM

A3

14

B3

15

A4

12

B4

11

C1

C2

C3

4

1

13

VCC = PIN 16

∑1

∑2

∑3

GND = PIN 8

= PIN NUMBERS

10

∑4

9

C4

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

∑2 + 4 ∑3 + 8 ∑4 + 16C4

Where: (+) = plus

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:

logic levels

Active HIGH

Active LOW

C0 A1 A2 A3 A4 B1 B2 B3 B4 ∑1 ∑2 ∑3 ∑4 C4

L LHL HHL LHHH L LH

0010 11001 1 1 0 01

1101 00110 0 0 1 10

(10+9=19)

(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.

http://onsemi.com

3

Share Link: