Datasheet > MAX7321

MAX7321

更新时间： 2023-12-20 18:45:45

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亚德诺 - ADI		/
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描述
I2C端口扩展器，具有8路漏极开路I/O

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MAX7321 数据手册

MAX7321

I C Port Expander with 8 Open-Drain I/Os

General Description

Features

● 400kHz I C Serial Interface

The MAX7321 2-wire serial-interfaced peripheral features

eight open-drain I/O ports with selectable internal pullups

and transition detection. Any port may be used as a logic

input or an open-drain output. Ports are overvoltage

protected to +6V independent of supply voltage.

● +1.71V to +5.5V Operating Voltage

● 8 Open-Drain I/O Ports Rated to 20mA Sink Current

● I/O Ports Are Overvoltage Protected to +6V

All I/O ports configured as inputs are continuously

monitored for state changes (transition detection). State

changes are indicated by the open-drain INT output.

The interrupt is latched, allowing detection of transient

changes. When the MAX7321 is subsequently accessed

through the serial interface, any pending interrupt is

cleared.

● Any Port Can Be a Logic Input or an Open-Drain

Output

● Selectable I/O Port Power-Up Default Logic States

● Transient Changes Are Latched, Allowing Detection

Between Read Operations

● INT Output Alerts Change on Inputs

The open-drain outputs are rated to sink 20mA and are

capable of driving LEDs.

● AD0 and AD2 Inputs Select from 16 Slave

Addresses

The RST input clears the serial interface, terminating any

● Low 0.6µA (typ) Standby Current

I C communication to or from the MAX7321.

● -40°C to +125°C Operating Temperature

The MAX7321 uses two address inputs with four-level

logic to allow 16 I C slave addresses. The slave address

also determines the power-up logic state for the I/O ports,

and enables or disables internal 40kΩ pullups in groups

of four ports.

Ordering Information

PIN-

TOP

PART

TEMP RANGE

PACKAGE

MARK

MAX7321AEE+ -40°C to +125°C 16 QSOP

MAX7321ATE+ -40°C to +125°C 16 TQFN-EP*

—

The MAX7321 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).

ADC

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

*EP = Exposed pad.

The MAX7321 is available in 16-pin QSOP and TQFN

packages, and is specified over the automotive temper-

ature range (-40°C to +125°C).

Selector Guide

OPEN-

Applications

● Cell Phones

● SAN/NAS

● Servers

INTERRUPT

MASK

PUSH-PULL

OUTPUTS

PART

INPUTS

DRAIN

● Notebooks

● Satellite Radio

OUTPUTS

MAX7319

MAX7320

Yes

—

Pin Conﬁgurations

MAX7321 Up to 8

MAX7322

—

Up to 8

—

AD0

16 V+

Yes

—

RST

AD2

15 SDA

14 SCL

MAX7323 Up to 4

MAX7328 Up to 8

MAX7329 Up to 8

Up to 4

Up to 8

MAX7321

—

13 INT

12 P7

11 P6

10 P5

—

Pin Configurations are continued at end of data sheet.

Typical Application Circuit and Functional Diagram appear

at end of data sheet.

GND

QSOP

19-3738; Rev 4; 7/14

12 3 4 5 6 7...15

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