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74F283

4-bit binary full adder with fast carry

Philips Electronics 

Philips Semiconductors

4-bit binary full adder with fast carry

Product specification

74F283

FEATURES

• High speed 4-bit addition

• Cascadable in 4-bit increments

• Fast Internal carry look-ahead

DESCRIPTION

The 74F283 adds two 4-bit binary words (An plus Bn) plus the

incoming carry. The binary sum appears on the sum outputs

(Σ0–Σ3) and the outgoing carry (COUT) according to the equation:

CIN+20(A0+B0)+21(A1+B1)+22(A2+B2)+23(A3+B3)

=Σ0+2Σ1+4Σ2+8Σ3+16COUT

where (+)=plus

Due to the symmetry of the binary add function, the 74F283 can be

used with either all active-High operands (positive logic) or with all

active-Low operands (negative logic). See Function Table. In case of

all active-Low operands (negative logic) the results Σ1–Σ4 and COUT

should be interpreted also as active-Low. With active-High inputs,

CIN cannot be left open; it must be held Low when no “carry in” is

intended. Interchanging inputs of equal weight does not affect the

operation, thus A0, B0, CIN can arbitrarily be assigned to pins 5, 6,

7, etc.

Due to pin limitations, the intermediate carries of the 74F283 are not

brought out for use as inputs or outputs. However, other means can

be used to effectively insert a carry into, or bring a carry out from, an

intermediate stage.

PIN CONFIGURATION

Σ1 1

B1 2

A1 3

Σ0 4

A0 5

B0 6

CIN 7

GND 8

16 VCC

15 B2

14 A2

13 Σ2

12 A3

11 B3

10 Σ3

9 COUT

SF00852

TYPE

74F283

TYPICAL

PROPAGATION

DELAY

6.5ns

TYPICAL

SUPPLY CURRENT

(TOTAL)

40mA

ORDERING INFORMATION

DESCRIPTION

COMMERCIAL RANGE

VCC = 5V ±10%,

Tamb = 0°C to +70°C

16-pin plastic DIP

N74F283N

16-pin plastic SO

N74F283D

PKG DWG #

SOT38-4

SOT109-1

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS

DESCRIPTION

74F(U.L.)

HIGH/LOW

A0 - A3

A operand inputs

1.0/2.0

B0 - B3

B operand inputs

1.0/2.0

CIN

COUT

Σ0–Σ3

Carry input

Carry output

Sum outputs

1.0/1.0

50/33

50/33

NOTE:

One (1.0) FAST Unit Load is defined as: 20µA in the High state and 0.6mA in the Low state.

LOAD VALUE

HIGH/LOW

20µA/1.2mA

20µA/1.2mA

20µA/0.6mA

1.0mA/20mA

1.0mA/20mA

LOGIC SYMBOL

LOGIC SYMBOL (IEEE/IEC)

5 6 3 2 14 15 12 11

A0 B0 A1 B1 A2 B2 A3 B3

7

CIN

COUT

9

Σ0 Σ1 Σ2 Σ3

VCC=Pin 16

GND=Pin 8

4 1 13 10

SF00853

5

Σ

0

3

P

14

12

3

0

4

Σ

1

6

0

13

2

3

10

15

Q

11

3

7

CI

CO

9

SF00854

1989 Mar 03

2

853-0364 95944

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