2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander

Please check latest availability status for a specific part variant.


The MAX7300 compact, serial-interfaced, I/O expansion peripheral provides microprocessors with up to 28 ports. Each port is individually user configurable to either a logic input or logic output.

Each port can be configured as either a push-pull logic output capable of sinking 10mA and sourcing 4.5mA, or a Schmitt logic input with optional internal pullup. Seven ports feature configurable transition detection logic, which generates an interrupt upon change of port logic level. The MAX7300 is controlled through an I²C-compatible 2-wire serial interface, and uses four-level logic to allow 16 I²C addresses from only two select pins.

The MAX7300AAX and MAX7300ATL have 28 ports and are available in 36-pin SSOP and 40-pin thin QFN packages, respectively. The MAX7300AAI and MAX7300ATI have 20 ports and are available in 28-pin SSOP and thin QFN packages. For an SPI™-interfaced version, refer to the MAX7301 data sheet. For a pin-compatible port expander with additional 24mA constant-current LED drive capability, refer to the MAX6956 data sheet.
MAX7300: Typical Operating Circuit MAX7300: Typical Operating Circuit Enlarge+

Key Features

  • 400kbps I²C-Compatible Serial Interface
  • 2.5V to 5.5V Operation
  • -40°C to +125°C Temperature Range
  • 20 or 28 I/O Ports, Each Configurable as
    • Push-Pull Logic Output
    • Schmitt Logic Input
    • Schmitt Logic Input with Internal Pullup
  • 11µA (max) Shutdown Current
  • Logic Transition Detection for Seven I/O Ports


  • Industrial Controllers
  • System Monitoring
  • White Goods

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

Part NumberInterfaceI/OInterrupt OutputDrive Current
minmaxSee Notes
MAX7300 Serial 2-Wire 400kbit20 or 28Yes102.55.5
$3.53 @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.
Product Reliability Reports: MAX7300.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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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