Rainbow Electronics MAX7311 User Manual

General description, Applications, Features

General Description

The MAX7311 2-wire-interfaced expander provides 16-
bit parallel input/output (I/O) port expansion for
SMBus™-compatible and I

C-compatible applications.

The MAX7311 consists of input port registers, output
port registers, polarity inversion registers, configuration
registers, a bus timeout register, and an SMBus/I

C-

compatible serial interface. The system master can
invert the MAX7311 input data by writing to the active-
high polarity inversion register. 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 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.

Applications

Servers

RAID Systems

Industrial Control

Medical Equipment

PLCs

Instrumentation and Test Measurement

Features

♦ 400kbps I

C-Compatible Serial Interface

♦ 2V to 5.5V Operation
♦ 5V Overvoltage Tolerant I/Os
♦ 16 I/O Pins that Default to Inputs on Power-Up
♦ Open-Drain Interrupt Output (INT)
♦ Bus Timeout for Lock-Up-Free Operation
♦ 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

MAX7311

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

with Interrupt

________________________________________________________________ Maxim Integrated Products

Ordering Information

19-2747; Rev 0; 1/03

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.

SMBus is a trademark of Intel Corp.

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

TOP VIEW

V+

SDA

SCL

AD0

I/O0

AD2

AD1

I/O15

I/O14

I/O13

I/O12

I/O4

I/O3

I/O2

I/O1

I/O11

I/O10

I/O9

I/O8

GND

I/O7

I/O6

I/O5

TSSOP/SSOP/SO

MAX7311

INT

THIN QFN