General Description

The MAX7323 2-wire serial-interfaced peripheral fea-

tures eight I/O ports. Four ports are push-pull outputs

and the other four are open-drain I/O ports, indepen-

dent of supply voltage.

The four I/O ports configured as inputs are continu-

ously monitored for state changes (transition detec-

tion). State changes are indicated by the open-drain

INT output. The interrupt is latched, allowing detection

of transient changes. When the MAX7323 is subse-

quently accessed through the serial interface, any

pending interrupt is cleared.

The four push-pull and four open-drain outputs are

rated to sink 20mA and are capable of driving LEDs.

The RST input clears the serial interface, terminating

The MAX7323 uses two address inputs with four-level

address also determines the power-up logic state for

the I/O ports, and enables or disables internal 40k

Ω

pullups for the input ports in groups of two ports.

The MAX7323 is one device in a family of pin-compatible

port expanders with a choice of input ports, open-drain

I/O ports, and push-pull output ports (see Table 1).

The MAX7323 is available in 16-pin QSOP and 16-pin

TQFN packages, and is specified over the automotive

temperature range (-40°C to +125°C).

Features

♦ +1.71V to +5.5V Operating Voltage

♦ 4 Push-Pull Output Ports Rated at 20mA Sink

Current

♦ 4 Open-Drain I/O Ports Rated to 20mA Sink Current

♦ 4 I/O Ports Are Overvoltage Protected to +6V

♦ Transient Changes Are Latched, Allowing Detection

Between Read Operations

♦ INT Output Alerts Change on Inputs

♦ AD0 and AD2 Inputs Select from 16 Slave

Addresses

♦ Low 0.6µA (typ) Standby Current

♦ -40°C to +125°C Operating Temperature Range

and 4 Open-Drain I/Os

________________________________________________________________ Maxim Integrated Products

1

19-3806; Rev 1; 7/07

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

PART

TEMP

RANGE

PIN-

PACKAGE

TOP

MARK

PKG

CODE

MAX7323AEE+

-40°C to

+125°C

16 QSOP

—

E16-4

MAX7323ATE+

-40°C to

+125°C

16 TQFN-EP*

3mm x 3mm

ADE

T1633-4

Pin Configurations and Functional Diagram appear at end

of data sheet.

Selector Guide

PART

INPUTS

INTERRUPT

MASK

OPEN-

DRAIN

OUTPUTS

PUSH-PULL

OUTPUTS

MAX7319

8

Yes

—

—

MAX7320

——

—

8

MAX7321

Up to 8

—

Up to 8

—

MAX7322

4

Yes

—

4

MAX7323

Up to 4

—

Up to 4

4

MAX7328

Up to 8

—

Up to 8

—

MAX7329

Up to 8

—

Up to 8

—

+Denotes a lead-free package.

*EP = Exposed paddle.

Cell Phones

SAN/NAS

Servers

Notebooks

RAID

Automotive

Applications

MAX7323

P2

O7

O6

P5

P4

V+

0.047

μF

μC

SCL

SDA

SCL

AD0

O1

O0

SDA

P3

AD2

INT

OUTPUT

OUTPUT

RST

INT

RST

I/O

I/O

I/O

I/O

OUTPUT

OUTPUT

3.3V

GND

Typical Application Circuit