Philips Semiconductors

Product specification

74F583

4-bit BCD adder

2

1989 Apr 06

853–1245 96263

FEATURES

DESCRIPTION

The 74F583 4-bit coded (BCD) full adder performs the addition of

two decimal numbers (A0–A3, B0–B3). The look-ahead generates

BCD carry terms internally, allowing the 74F583 to then do BCD

addition correctly. For BCD numbers 0 through 9 at A and B inputs,

the BCD sum forms at the output.

In addition of two BCD numbers totalling a number greater than 9, a

valid BCD number and carry will result. For input values larger than

9, the number is converted from binary to BCD. Binary to BCD

conversion occurs by grounding one set of inputs, An or Bn, and

applying a 4-bit binary number to the other set of inputs. If the input

is between 0 and 9, a BCD number occurs at the output. If the

binary input falls between 10 and 15, a carry term is generated. Both

the carry term and the sum are the BCD equivalent of the binary

input. Converting binary numbers greater than 16 may be achieved

by cascading 74F583s.

PIN CONFIGURATION

1

2

3

4

5

6

7

89

10

11

12

13

14

15

16

B1

B2

B3

A3

S2

GND

A2

A1

A0

B0

S0

S1

S3

SF01436

TYPE

TYPICAL

PROPAGATION

DELAY

TYPICAL

SUPPLY CURRENT

(TOTAL)

74F583

9.0 ns

45 mA

ORDERING INFORMATION

PACKAGE

COMMERCIAL RANGE

DRAWING

NUMBER

16-pin plastic DIP

N74F583N

SOT38-4

16-pin plastic SO

N74F583D

SOT109-1

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS

DESCRIPTION

74F (U.L.)

HIGH / LOW

LOAD VALUE

HIGH / LOW

A0–A3

A operand inputs

1.0 / 2.0

20

µA / 1.2 mA

B0–B3

B operand inputs

1.0 / 2.0

20

µA / 1.2 mA

Carry input

1.0 / 1.0

20

µA / 0.6 mA

Carry output

50 / 33

1.0 mA / 20 mA

S0–S3

Sum outputs

50 / 33

1.0 mA / 20 mA

NOTE:

One (1.0) FAST Unit Load is defined as 20

µA in the High state and 0.6 mA in the Low state.

LOGIC SYMBOL

A0

B0

A1

B1

A2

B2

A3

B3

S0

S1

S2

S3

3

4

2

15

1

14

12

13

11

10

7

9

6

5

GND = Pin 8

SF01437

LOGIC SYMBOL (IEEE/IEC)

13

14

15

4

12

1

2

3

5

11

10

7

9

6

0

3

CO

CI

0

3

0

3

Σ

P

Q

SF01438