MAX7300_14 Datasheet, PDF(1/20 Page) Maxim Integrated Products – 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander

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MAX7300_14 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander

MAX7300

2-Wire-Interfaced, 2.5V to 5.5V,

20-Port or 28-Port I/O Expander

General Description

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

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 I2C-compatible 2-wire

serial interface, and uses four-level logic to allow 16 I2C

addresses from only two select pins.

The MAX7300AAX and MAX7300ATL have 28 ports and

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

respectively. The MAX7300AAI and MAX7300ATI have 20

ports and are available in 28-pin SSOP and TQFN pack-

ages. For an SPI-interfaced version, refer to the MAX7301

data sheet. For a pin-compatible port expander with addi-

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

the MAX6956 data sheet.

Application

ââ White Goods

ââ Industrial Controllers

ââ System Monitoring

Pin Configurations

TOP VIEW

ISET 1

GND 2

GND 3

AD0 4

P12 5

P13 6

P14 7

P15 8

P16 9

P17 10

P18 11

P19 12

P20 13

P21 14

MAX7300

28 V+

27 AD1

26 SCL

25 SDA

24 P31

23 P30

22 P29

21 P28

20 P27

19 P26

18 P25

17 P24

16 P23

15 P22

28 SSOP

Pin Configurations continued at end of data sheet.

Features

ââ 400kbps I2C-Compatible Serial Interface

ââ 2.5V to 5.5V Operation

ââ -40Â°C to +125Â°C Temperature Range

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

Push-Pull Logic Output

Schmitt Logic Input

Schmitt Logic Input with Internal Pullup

ââ 11ÂµA (max) Shutdown Current

ââ Logic Transition Detection for Seven I/O Ports

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX7300AAI

-40Â°C to +125Â°C 28 SSOP

MAX7300ATI

-40Â°C to +125Â°C 28 TQFN-EP*

MAX7300AAX

-40Â°C to +125Â°C 36 SSOP

MAX7300ATL

-40Â°C to +125Â°C 40 TQFN-EP*

*EP = Exposed pad.

Devices are also available in a lead(Pb)-free/RoHS-compliant

package. Specify lead-free by adding â+â to the part number

when ordering. Devices are also available in tape-and-reel

packaging. Specify tape and reel by adding âTâ to the part

number when ordering.

Typical Operating Circuit

47nF

39kâ¦

DATA

CLOCK

36 V+

3 GND

GND

ISET

35 AD1

4 AD0

33 SDA

34 SCL

31 P31

29 P30

27 P29

25 P28

24 P27

23 P26

22 P25

21 P24

MAX7300AAX

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

19-2413; Rev 8; 5/14

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