I2C Port Expander with 8 Push-Pull and 8 Open-Drain I/Os

Low Operating Supply Voltage I2C Port Expander with 8 Push-Pull and 8 Configurable Open-Drain I/Os

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The MAX7325 2-wire serial-interfaced peripheral features 16 I/O ports. Ports are divided into eight push-pull outputs and eight I/Os with selectable internal pullups and transition detection. Eight ports are push-pull outputs and eight I/Os may be used as a logic input or an open-drain output. 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 active-low INT output. The interrupt is latched, allowing detection of transient changes. When the MAX7325 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 active-low RST input clears the serial interface, terminating any I2C communication to or from the MAX7325.

The MAX7325 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 MAX7325 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 of the full data sheet).

The MAX7325 is available in 24-pin QSOP and TQFN packages and is specified over the -40°C to +125°C automotive temperature range.
MAX7325: Functional Diagram MAX7325: Functional Diagram Enlarge+

Key Features

  • 400kHz I2C Serial Interface
  • +1.71V to +5.5V Operating Voltage
  • 8 Push-Pull Output Ports
  • 8 Open-Drain I/O Ports, Rated at 20mA Sink Current
  • I/O Ports are Overvoltage Protected to +6V
  • Selectable I/O Port Power-Up Default Logic States
  • Transient Changes are Latched, Allowing Detection Between Read Operations
  • Active-Low INT Output Alerts Changes on Inputs
  • AD0 and AD2 Inputs Select from 16 Slave Addresses
  • Low 0.6µA (typ) Standby Current
  • -40°C to +125°C Temperature Range


  • Automotive
  • Cell Phones
  • Notebooks
  • Satellite Radio
  • Servers

See parametric specs for I/O Port Expanders (31)

Part NumberInterfaceI/OReset InputInterrupt OutputOver Voltage Protection
Drive Current
minmaxSee Notes
Serial - I2C Compatible
Serial 2-Wire 400kbit
$1.18 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX7325EVCMAXQU: Evaluation Kit/Evaluation System for the MAX7325
MAX7325EVKIT: Evaluation Kit/Evaluation System for the MAX7325
Request Reliability Report for: MAX7325 
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Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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