MAX7323

Low Operating Supply Voltage I²C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os

Status

Active: In Production.

Description

FULL DATA SHEET (PDF, 216kB)
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The MAX7323 2-wire serial-interfaced peripheral features eight I/O ports. Four ports are push-pull outputs and the other four are open-drain I/O ports that are overvoltage protected up to +6V independent of the supply voltage.

The four I/O ports configured as inputs are continuously monitored for state changes (transition detection). State changes are indicated by the open-drain active-low INT output. The interrupt is latched, allowing detection of transient changes. When the MAX7323 is subsequently 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 active-low RST input clears the serial interface, terminating any I²C communication to or from the MAX7323.

The MAX7323 uses two address inputs with four-level logic to allow 16 I²C slave addresses. The slave address also determines the power-up logic state for the I/O ports, and enables or disables internal 40k�� 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 in the full data sheet).

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).

Key Features		Applications/Uses
400kHz I²C Serial Interface +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 Active-Low 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		Automotive Cell Phones Notebooks RAID SAN/NAS Servers

Key Specifications: I/O Port Expanders

Part Number

Features

Interface

I/O

Outputs

Reset Input

Interr.Out

Over Voltage Protect.

Drive Current
(mA)

V_SUPPLY
(V)

Price

min

max

See Notes

MAX7323

16 Slave IDs

Low Standby Current

Open Drain Outputs

Port pullups

Transition Detection

Serial - I²C Compatible

Serial 2-Wire 400kbit

Yes

1.71

5.5

$0.98 @1k

See All I/O Port Expanders (26)

Diagram

Typical Application Circuit

source��ShenZhen henlito electronic co.,ltd.

web:www.henlito.com