General Description

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

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

registers, output port registers, polarity inversion regis-

ters, configuration registers, a bus timeout register, and

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

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 100k

Ω

pullup resistors, refer to the MAX7311 data sheet.

Applications

Servers/Blades

RAID Systems

Medical Equipment

Instrumentation and Test Measurement

Networking

Features

o 2V to 5.5V Operation

o 5V Overvoltage Tolerant I/Os

o Supports Hot Insertion

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

o Open-Drain Interrupt Output (INT)

o Bus Timeout for Lock-Up-Free Operation

o Noise Filter on SCL/SDA Inputs

o 64 User-Selectable Slave ID Addresses

o Low Standby Current (2.9µA typ)

o Polarity Inversion

o -40°C to +125°C Operation

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

with Interrupt and Hot-Insertion Protection

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-3057; Rev 0; 10/03

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.

Inc., or one of its Sublicense Associate Companies conveys a

PART

TEMP RANGE

PIN-PACKAGE

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)

MAX7312AUG

-40°C to +125°C 24 TSSOP

TOP VIEW

24

23

22

21

20

19

18

17

1

2

3

4

5

6

7

8

V+

SDA

SCL

AD0

I/O0

AD2

AD1

I/O15

I/O14

I/O13

I/O12

I/O4

I/O3

I/O2

I/O1

16

15

14

13

9

10

11

12

I/O11

I/O10

I/O9

I/O8

GND

I/O7

I/O6

I/O5

TSSOP/SSOP/SO

MAX7312

INT

THIN QFN

MAX7312

1

2

3

4

78

9

10

11

12

24

23

22

21

20

19

5

6

18

17

16

15

14

13

I/O0

I/O2

I/O1

I/O3

I/O5

I/O6 I/O7 GND I/O8 I/O9 I/O10

AD2 AD1

I/O4

AD0

I/O14

I/O15

I/O13

I/O11

I/O12

INT

Pin Configurations