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MAX7312

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

Maxim Integrated 

19-3057; Rev 3; 4/05

EVAALVUAAILTAIOBNLEKIT

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

with Interrupt and Hot-Insertion Protection

General Description

The MAX7312 2-wire-interfaced expander provides 16-bit

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

I2C applications. The MAX7312 consists of input port

registers, output port registers, polarity inversion regis-

ters, configuration registers, a bus timeout register, and

an I2C-compatible serial interface logic, compatible with

SMBus. The system master can invert the MAX7312 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

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

as inputs. Three address select pins configure the part

to one of 64 slave ID addresses.

The MAX7312 supports hot insertion. All port pins, the

INT output, SDA, SCL, and the slave address inputs

AD0-2 remain high impedance in power-down (Vt = 0V)

up to 6V.

The MAX7312 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 with integrated 100kΩ

pullup resistors, refer to the MAX7311 data sheet.

Applications

Servers/Blades

RAID Systems

Medical Equipment

Instrumentation and Test Measurement

Networking

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

♦ Open-Drain Interrupt Output (INT)

♦ Bus Timeout for Lock-Up-Free Operation

♦ Noise Filter on SCL/SDA Inputs

♦ 64 User-Selectable Slave ID Addresses

♦ 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

PKG

CODE

MAX7312AWG -40°C to +125°C 24 Wide SO

—

MAX7312AAG -40°C to +125°C 24 SSOP

—

MAX7312ATG -40°C to +125°C 24 Thin QFN

(4mm x 4mm)

T2444-4

MAX7312AUG -40°C to +125°C 24 TSSOP

—

SMBus is a trademark of Intel Corp.

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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

MAX7312

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

TSSOP/SSOP/SO

18 17 16 15 14 13

SCL 19

12 I/O10

SDA 20

11 I/O9

V+ 21

INT 22

MAX7312ATG

10 I/O8

9 GND

AD1 23

AD2 24

8 I/O7

7 I/O6

12 3456

THIN QFN

________________________________________________________________ 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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