MAX7301 Datasheet, PDF(1/18 Page) Maxim Integrated Products – 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander

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MAX7301 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander

19-2438; Rev 3; 10/03

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

28-Port I/O Expander

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

SPIâ¢-compatible 4-wire serial interface.

The MAX7301AAX and MAX7301AGL have 28 ports and

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

respectively. The MAX7301AAI and MAX7301ANI have

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

packages, respectively.

For a 2-wire interfaced version, refer to the MAX7300

data sheet.

For a pin-compatible port expander with additional

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

MAX6957 data sheet.

White Goods

Applications

Automotive

Gaming Machines

Industrial Controllers

System Monitoring

Pin Configurations appear at end of data sheet.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

Features

â¦ High-Speed 26MHz SPI-/QSPI-â¢/MICROWIREâ¢-

Compatible Serial Interface

â¦ 2.5V to 5.5V Operation

â¦ -40Â°C to +125Â°C Temperature Range

â¦ 20 or 28 I/O Ports, Each Configurable as

Push-Pull Logic Output

Schmitt Logic Input

Schmitt Logic Input with Internal Pullup

â¦ 11ÂµA (max) Shutdown Current

â¦ Logic Transition Detection for Seven I/O Ports

PART

MAX7301ANI

MAX7301AAI

MAX7301AAX

MAX7301AGL

Ordering Information

TEMP RANGE

-40Â°C to +125Â°C

PIN-PACKAGE

28 DIP

28 SSOP

36 SSOP

40 QFN

Typical Operating Circuit

47nF

36 V+

3 GND

2 GND

39kâ¦ 1 ISET

MAX7301

CHIP SELECT

CLOCK IN

DATA IN

DATA OUT

35 CS

33 SCLK

34 DIN

4 DOUT

31 P31

29 P30

27 P29

25 P28

24 P27

23 P26

22 P25

21 P24

P4 32

P5 30

P6 28

P7 26

P8 5

P9 7

P10 9

P11 11

P12 6

P13 8

P14 10

P15 12

P16 13

P17 14

P18 15

P19 16

P20 17

P21 18

P22 19

P23 20

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

________________________________________________________________ Maxim Integrated Products 1

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

1-888-629-4642, or visit Maximâs website at www.maxim-ic.com.

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