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MAX7311

2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection

Maxim Integrated 

19-2747; Rev 4; 4/05

2-Wire-Interfaced 16-Bit I/O Port Expander

with Interrupt and Hot-Insertion Protection

General Description

The MAX7311 2-wire-interfaced expander provides 16-bit

parallel input/output (I/O) port expansion for SMBus™

and I2C™ applications. The MAX7311 consists of input

port registers, output port registers, polarity inversion reg-

isters, configuration registers, a bus timeout register, and

an I2C-compatible serial interface logic compatible with

SMBus. The system master can invert the MAX7311 input

data by writing to the active-high polarity inversion regis-

ter. The system master can enable or disable bus timeout

by writing to the bus timeout register.

Any of the 16 I/O ports can be configured as an input or

output. A power-on reset (POR) initializes the 16 I/Os

as inputs. Three address select pins configure one of

64 slave ID addresses.

The MAX7311 supports hot insertion. All port pins, the

INT output, SDA, SCL and the slave address inputs

AD0–2 remain high impedance in power down (V+ =

0V) with up to 6V asserted upon them.

The MAX7311 is available in 24-pin SO, SSOP, TSSOP,

and thin QFN packages and is specified over the -40°C

to +125°C automotive temperature range.

For applications requiring I/Os without pullup resistors,

refer to the MAX7312 data sheet.

Applications

Servers

RAID Systems

Industrial Control

Medical Equipment

PLCs

Instrumentation and Test Measurement

Pin Configurations

TOP VIEW

INT 1

AD1 2

AD2 3

I/O0 4

I/O1 5

I/O2 6

I/O3 7

I/O4 8

I/O5 9

I/O6 10

I/O7 11

GND 12

MAX7311

24 V+

23 SDA

22 SCL

21 AD0

20 I/O15

19 I/O14

18 I/O13

17 I/O12

16 I/O11

15 I/O10

14 I/O9

13 I/O8

18 17 16 15 14 13

SCL 19

12 I/O10

SDA 20

11 I/O9

V+ 21

INT 22

MAX7311ATG

10 I/O8

9 GND

AD1 23

8 I/O7

AD2 24

7 I/O6

12 3456

THIN QFN

TSSOP/SSOP/SO

Features

♦ 400kbps I2C-Compatible Serial Interface

♦ 2V to 5.5V Operation

♦ 5V Overvoltage Tolerant I/Os

♦ Supports Hot Insertion

♦ 16 I/O Pins that Default to Inputs on Power-Up

♦ 100kΩ Pullup on Each I/O

♦ Open-Drain Interrupt Output (INT)

♦ Bus Timeout for Lock-Up-Free Operation

♦ Noise Filter on SCL / SDA Inputs

♦ 64 Slave ID Addresses Available

♦ Low Standby Current (2.9µA typ)

♦ Polarity Inversion

♦ 4mm ✕ 4mm, 0.8mm Thin QFN Package

♦ -40°C to +125°C Operation

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX7311AWG -40°C to +125°C 24 Wide SO

MAX7311AAG -40°C to +125°C 24 SSOP

MAX7311ATG -40°C to +125°C 24 Thin QFN

(4mm ✕ 4mm)

MAX7311AUG -40°C to +125°C 24 TSSOP

PKG

CODE

—

—

T2444-4

—

SMBus is a trademark of Intel Corp.

Purchase of I2C components of Maxim Integrated Products, Inc.

or one of its sublicensed Associated Companies, conveys a

license under the Phillips I2C Patent Rights to use these compo-

nents in an I2C system, provided that the system conforms to the

I2C Standard Specification as defined by Phillips.

________________________________________________________________ Maxim Integrated Products 1

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.

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