General Description

The MAX7322 2-wire serial-interfaced peripheral features

four push-pull outputs and four input ports with selectable

internal pullups. Input ports are overvoltage protected to

+6V and feature transition detection with interrupt output.

The four input ports are continuously monitored for state

changes (transition detection). The interrupt is latched,

allowing detection of transient changes. Any combination

of inputs can be selected using the interrupt mask to

assert the open-drain INT output. When the MAX7322 is

subsequently accessed through the serial interface, any

pending interrupt is cleared.

The four push-pull outputs are rated to sink 20mA, and

are capable of driving LEDs.

The RST input clears the serial interface, terminating any

The MAX7322 uses two address inputs with four-level

also sets the power-up default logic state for the four out-

put ports, and enables or disables internal 40k

Ω pullups

for the input ports.

The MAX7322 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 MAX7322 is available in 16-pin QSOP and TQFN

packages, and is specified over the -40°C to +125°C

automotive temperature range.

Applications

Features

♦ +1.71V to +5.5V Operation Voltage

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

Current

♦ 4 Input Ports with Maskable, Latching Transition

Detection

♦ Input Ports are Overvoltage Protected to +6V

♦ Transient Changes are Latched, Allowing

Detection Between Read Operations

♦ INT Output Alerts Change on Any Selection of

Inputs

♦ AD0 and AD2 Inputs Select from 16 Slave

Addresses

♦ Low 0.6µA (typ) Standby Current

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

4 Push-Pull Outputs and 4 Inputs

________________________________________________________________ Maxim Integrated Products

1

19-3787; Rev 1; 9/06

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.

EVALUATION

KIT

AVAILABLE

Ordering Information

PART

TEMP

RANGE

PIN-

PACKAGE

TOP

MARK

PKG

CODE

MAX7322AEE+

-40°C to

+125°C

16 QSOP

—

E16-4

MAX7322ATE+

-40°C to

+125°C

16 TQFN-EP*

(3mm x 3mm)

ADD

T1633-4

Typical Application Circuit and Functional Diagram appear

at end of data sheet.

Cell Phones

SAN/NAS

Servers

Notebooks

Satellite Radio

Automotive

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 lead-free package.

*EP = Exposed paddle.

15

16

14

13

5

6

7

8

13

V+

4

12

10

9

AD0

RST

I5

I4

GND

I3

MAX7322

2

11

SDA

TQFN

(3mm x 3mm)

TOP VIEW

*EP

+

Pin Configurations

Pin Configurations continued at end of data sheet.