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MAX7321：I2C Port Expander with 8 Open-Drain I/Os

An 8 Push-Pull Output GPIO/LED Driver with an RST Input Software Compatible with the MAX7324, MAX7325, MAX7326 and MAX7327 (16-Port GPIOs)

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 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

MAX7321: Typical Operating Circuit Applications/Uses Cell Phones Notebooks SAN/NAS Satellite Radio Servers

DataSheet

Parametrics

Design kits & evaluation modules

• MAX7321EVKIT

Quality and Environmental Data

• MAX7321.pdf

Ordering Information