General Description

The MAX7301 compact, serial-interfaced I/O expander

(or general-purpose I/O (GPIO) peripheral) provides

microprocessors with up to 28 ports. Each port is indi-

vidually user configurable to either a logic input or logic

output.

Each port can be configured either as 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 MAX7301 is controlled through an

SPI™-compatible 4-wire serial interface.

The MAX7301AAX and MAX7301ATL have 28 ports and

are available in 36-pin SSOP and 40-pin TQFN packages,

respectively. The MAX7301AAI has 20 ports and is avail-

able in a 28-pin SSOP package.

MAX7300 data sheet.

For a pin-compatible port expander with additional

24mA constant-current LED drive capability, refer to the

MAX6957 data sheet.

Applications

White Goods

Automotive

Gaming Machines

Industrial Controllerss

System Monitoring

Features

♦ High-Speed 26MHz SPI-/QSPI-™/MICROWIRE™-

Compatible Serial Interface

♦ 2.5V to 5.5V Operation

♦ -40°C to +125°C Temperature Range

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

Push-Pull Logic Output

Schmitt Logic Input

Schmitt Logic Input with Internal Pullup

♦ 11µA (max) Shutdown Current

♦ Logic Transition Detection for Seven I/O Ports

4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and

28-Port I/O Expander

________________________________________________________________ Maxim Integrated Products

1

19-2438; Rev 6; 4/06

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.

Pin Configurations appear at end of data sheet.

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX7301AAI+

-40

°C to +125°C

28 SSOP

A28-1

MAX7301AAX+

-40

°C to +125°C

36 SSOP

A36-4

MAX7301ATL+

-40

°C to +125°C

40 TQFN

T4066-5

P5

P4

P7

P8

P6

P10

P9

P12

P13

P11

P15

P14

P17

P18

P16

P20

P19

P22

P23

P21

36

2

3

33

4

34

35

29

27

31

24

25

22

21

23

V+

GND

GND

SCLK

DIN

DOUT

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

CS

MAX7301

3V

SSOP

CHIP SELECT

DATA IN

CLOCK IN

DATA OUT

I/O 4

I/O 5

I/O 6

I/O 7

I/O 8

I/O 9

I/O 10

I/O 11

I/O 12

I/O 13

I/O 14

I/O 15

I/O 16

I/O 17

I/O 18

I/O 19

I/O 20

I/O 21

I/O 22

I/O 23

I/O 24

I/O 25

I/O 26

I/O 27

I/O 28

I/O 29

I/O 30

I/O 31

47nF

1

ISET

39k

Ω

Typical Operating Circuit

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

+Denotes lead-free package.