General Description

The MAX7300 compact, serial-interfaced, I/O expan-

sion peripheral provides microprocessors with up to 28

ports. Each port is individually user configurable to

either a logic input or logic output.

Each port can be configured as either a push-pull logic

output capable of sinking 10mA and sourcing 4.5mA, or a

Schmitt logic input with optional internal pullup. Seven

ports feature configurable transition detection logic, which

generates an interrupt upon change of port logic level.

The MAX7300 is controlled through an I

2-wire serial interface, and uses four-level logic to allow

16 I

The MAX7300AAX and MAX7300AGL have 28 ports

and are available in 36-pin SSOP and 40-pin QFN pack-

ages, respectively. The MAX7300AAI and MAX7300ANI

have 20 ports and are available in 28-pin SSOP and 28-

pin DIP packages, respectively.

Applications

White Goods

Industrial Controllers

Automotive

System Monitoring

Features

o 2.5V to 5.5V Operation

o -40°C to +125°C Temperature Range

o 20 or 28 I/O Ports, Each Configurable as

Push-Pull Logic Output

Schmitt Logic Input

Schmitt Logic Input with Internal Pullup

o 11µA (max) Shutdown Current

o Logic Transition Detection for Seven I/O Ports

2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or

28-Port I/O Expander

________________________________________________________________ Maxim Integrated Products

1

19-2413; Rev 1; 2/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX7300ANI

-40

°C to +125°C

28 DIP

MAX7300AAI

-40

°C to +125°C

28 SSOP

MAX7300AAX

-40

°C to +125°C

36 SSOP

MAX7300AGL

-40

°C to +125°C

40 QFN

P5

P4

P7

P8

P6

P10

P9

P12

P13

P11

P15

P14

P17

P18

P16

P20

P19

I/O 5

I/O 4

I/O 7

I/O 8

I/O 6

I/O 10

I/O 9

I/O 12

I/O 13

I/O 11

I/O 15

I/O 14

I/O 17

I/O 18

I/O 16

I/O 20

I/O 19

I/O 21

I/O 22

I/O 23

P22

P23

P21

36

2

3

4

33

35

34

29

27

31

24

25

22

21

23

V+

GND

GND

AD0

AD1

SCL

P30

P29

P31

P27

P28

P25

P24

P26

32

30

26

5

7

9

28

6

8

11

10

12

14

15

13

17

16

19

20

18

SDA

MAX7300AAX

3V

DATA

CLOCK

I/O 24

I/O 25

I/O 27

I/O 26

I/O 29

I/O 30

I/O 28

I/O 31

47nF

39k

Ω

1

ISET

Typical Operating Circuit

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

V+

AD1

SCL

SDA

P31

P30

P22

P29

P28

P27

P26

P25

P24

P23

P21

P20

P19

P18

P17

P16

P15

P14

P13

P12

AD0

GND

GND

ISET

SSOP/DIP

TOP VIEW

MAX7300

Pin Configurations

Pin Configurations continued at end of data sheet.