Philips Semiconductors FAST Products

Product specification

74F181

Arithmetic logic unit

1

March 3, 1989

853–0351 95947

FEATURES

double; plus 12 other arithmetic operations

Compare, AND, NAND, NOR, OR, plus 10 other logic operations

words

DESCRIPTION

The 74F181 is a 4-bit high-speed parallel Arithmetic Logic Unit

(ALU). Controlled by the four Function Select inputs (S0–S3) and

the Mode Control input (M), it can perform all the 16 possible logic

operations or 16 different arithmetic operations on active-High or

active-Low operands. The Function Table lists these operations.

PIN CONFIGURATION

SF00193

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

B0

A0

S3

S2

S1

S0

Cn

M

F0

F1

F2

VCC

A1

B1

A2

B2

A3

B3

G

P

A=B

F3

GND

TYPE

TYPICAL PROPAGATION DELAY

TYPICAL

SUPPLY CURRENT

(TOTAL)

74F181

7.0ns

43mA

ORDERING INFORMATION

DESCRIPTION

COMMERCIAL RANGE

24-Pin Plastic Slim DIP (300 mil)

N74F181N

24-Pin Plastic SOL

N74F181D

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS

DESCRIPTION

74F (U.L.) HIGH/LOW

LOAD VALUE HIGH/LOW

A0–A3

A operand inputs

1.0/3.0

20

µA/1.8mA

B0–B3

B operand inputs

1.0/3.0

20

µA/1.8mA

M

Mode control input

1.0/1.0

20

µA/0.6mA

S0–S3

Function select input

1.0/4.0

20

µA/2.4mA

Cn

Carry input

1.0/5.0

20

µA/3.0mA

Carry output

50/33

1.0mA/20mA

P

Carry Propagate output

50/33

1.0mA/20mA

G

Carry Generate output

50/33

1.0mA/20mA

A=B

Compare output

OC/33

OC/20mA

F0–F3

Outputs

50/33

1.0mA/20mA

NOTE:

One (1.0) FAST unit load is defined as: 20

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

OC = Open Collector