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Data Sheet

FULL DATA SHEET (PDF, 588kB) Download   E-Mail

Description

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. All 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 MAX7321 is subsequently accessed through the serial interface, any pending interrupt is cleared. The open-drain outputs are rated to sink 20mA and are capable of driving LEDs. The +6V tolerant active-low RST input clears the serial interface, terminating any I²C communication to or from the MAX7321. The MAX7321 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 40kΩ pullups in groups of four ports. 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. The MAX7321 is available in 16-pin QSOP and 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 8 Open-Drain I/O Ports Rated to 20mA Sink Current I/O Ports Are Overvoltage Protected to +6V 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 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		Automotive Cell Phones Notebooks SAN/NAS Satellite Radio Servers

Diagram

Typical Operating Circuit

Evaluation Kits

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Reliability Reports

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Software/Models

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Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-8 of 8
MAX7321	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX7321AEE+			QSOP;16 pin; Dwg: 21-0055H (PDF) Use pkgcode/variation: E16+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX7321AEE+T			QSOP;16 pin; Dwg: 21-0055H (PDF) Use pkgcode/variation: E16+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX7321AEE			QSOP;16 pin; Dwg: 21-0055H (PDF) Use pkgcode/variation: E16-4*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX7321AEE-T				-40°C to +125°C	See data sheet
MAX7321ATE+T			THIN QFN;16 pin; Dwg: 21-0136I (PDF) Use pkgcode/variation: T1633+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX7321ATE+			THIN QFN;16 pin; Dwg: 21-0136I (PDF) Use pkgcode/variation: T1633+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX7321ATE			THIN QFN;16 pin; Dwg: 21-0136I (PDF) Use pkgcode/variation: T1633-4*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX7321ATE-T			THIN QFN;16 pin; Dwg: 21-0136I (PDF) Use pkgcode/variation: T1633-4*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis

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