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MAX7319

I2C Port Expander with Eight Inputs and Maskable Transition Detection

Maxim Integrated 

MAX7319

EVALUATION KIT AVAILABLE

I2C Port Expander with Eight Inputs

and Maskable Transition Detection

General Description

The MAX7319 2-wire serial-interfaced peripheral

fea-tures eight input ports with selectable internal pullups,

overvoltage protection to +6V, and transition detection

with interrupt output.

All input ports are continuously monitored for state

changes (transition detection). Transitions are latched,

allowing detection of transient changes. Any combination

of inputs can be selected using the interrupt mask to assert

the INT output. When the MAX7319 is subsequently

accessed through the serial interface, any pending

interrupt is cleared.

The +5.5V tolerant RST input clears the serial

interface, terminating any I2C communication to or from

the MAX7319.

The MAX7319 uses two address inputs with four-level

logic to allow 16 I2C slave addresses. The slave address

also enables or disables internal 40kΩ pullups in groups

of four ports.

The MAX7319 supports hot insertion. All eight input ports,

the serial interface SDA, SCL, AD0, AD2, INT, and RST

remain high impedance in power-down (V+ = 0) with up

to +6V asserted on them.

The MAX7319 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 MAX7319 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

●● 400kHz, +5.5V-Tolerant I2C Serial Interface

●● +1.71V to +5.5V Operating Voltage

●● Eight 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

Ordering Information

PART

MAX7319AEE+

MAX7319ATE+

TEMP RANGE

PIN-

PACKAGE

-40° TO +125°C 16 QSOP

-40° TO +125°C 16 TQFN-EP*

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

TOP

MARK

—

ADA

Pin Configurations, Typical Application Circuit, and

Functional Diagram appear at end of data sheet.

Applications

●● Cell Phones

●● SAN/NAS

●● Servers

●● Notebooks

●● Satellite Radio

Selector Guide

PART

INPUTS

MAX7319

8

MAX7320

—

MAX7321

Up to 8

MAX7322

4

MAX7323

Up to 4

MAX7328*

MAX7329**

Up to 8

*Second source to PCF8574.

**Second source to PCF8574A.

INTERRUPT MASK

Yes

—

—

Yes

—

—

—

OPEN-DRAIN OUTPUTS

—

—

Up to 8

—

Up to 4

Up to 8

PUSH-PULL OUTPUTS

—

8

—

4

4

—

—

19-3809; Rev 2; 5/14

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