I²C Port Expander with Eight Inputs and Maskable Transition Detection

Best-Suited Port Expander to Monitor Transient Changes at the Inputs for Data-Sensitive Applications with Wide Operating Voltage and Temperature Ranges

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The MAX7319 2-wire serial-interfaced peripheral features eight input ports with selectable internal pullups, overvoltage protection to +6V, and transition detection with interrupt output.

All input ports are continuously monitored for state changes (transition detection). Transitions are latched, allowing detection of transient changes. Any combination of inputs can be selected using the interrupt mask to assert the active-low INT output. When the MAX7319 is subsequently accessed through the serial interface, any pending interrupt is cleared.

The +5.5V tolerant active-low RST input clears the serial interface, terminating any I²C communication to or from the MAX7319.

The MAX7319 uses two address inputs with four-level logic to allow 16 I²C slave addresses. The slave address also enables or disables internal 40kΩ pullups in groups of four ports.

The MAX7319 supports hot insertion. All eight input ports, the serial interface SDA, SCL, AD0, AD2, active-low INT, and active-low RST remain high impedance in power-down (V+ = 0) with up to +6V asserted on them.

The MAX7319 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 MAX7319 is available in 16-pin QSOP and 16-pin TQFN packages, and is specified over the automotive temperature range (-40°C to +125°C).
MAX7319: Typical Application Circuit MAX7319: Typical Application Circuit Enlarge+

Key Features

  • 400kHz, +5.5V-Tolerant I²C Serial Interface
  • +1.71V to +5.5V Operating Voltage
  • Eight Input Ports with Maskable, Latching Transition Detection
  • Input Ports are Overvoltage Protected to +6V
  • Transient Changes are Latched, Allowing Detection Between Read Operations
  • Active-Low INT Output Alerts Change on Any Selection of Inputs
  • AD0 and AD2 Inputs Select from 16 Slave Addresses
  • Low 0.6µA (typ) Standby Current
  • -40°C to +125°C


  • Cell Phones
  • Notebooks
  • Satellite Radio
  • Servers

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

Part NumberInterfaceInputsReset InputInterrupt OutputOver Voltage Protection
Drive Current
(min)(max)(See Notes)
Serial - I2C Compatible
Serial 2-Wire 400kbit
$1.89 @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.
Request Reliability Report for: MAX7319 
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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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