2-Wire-Interfaced 8-Bit I/O Port Expander with Reset

2-Wire-Interfaced 8-Bit I/O Port Expander with Reset can Sink Up to 30mA per Port for SMBus™-Compatible and I²C-Compatible Applications

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The MAX7310 provides 8-bit parallel input/output port expansion for SMBus™-compatible and I²C-compatible applications. The MAX7310 consists of an input port register, an output port register, a polarity inversion register, a configuration register, a bus timeout register, and an SMBus/I²C-compatible serial interface. The system master can invert the MAX7310 input data by writing to the active-high polarity inversion register. The system master can enable or disable bus timeout by writing to the bus timeout register.

Any of the eight I/O ports can be configured as input or output. An active-low reset input sets the eight I/Os as inputs. Three address-select pins configure one of 56 slave ID addresses.

The MAX7310 is available in 16-pin thin QFN, TSSOP, and QSOP packages and is specified over the -40°C to +125°C automotive temperature range.
MAX7310: Typical Operating Circuit MAX7310: Typical Operating Circuit Enlarge+

Key Features

  • 400kHz 2-Wire Interface
  • 2.3V to 5.5V Operation
  • Low Standby Current (1.7µA typ)
  • Bus Timeout for Lock-Up-Free Operation
  • 56 Slave ID Addresses
  • Polarity Inversion
  • Eight I/O Pins that Default to Inputs on Power-Up
  • 5V Tolerant Open-Drain Output on I/O0
  • 4mm x 4mm, 0.8mm Thin QFN Package
  • -40°C to +125°C Operation


  • Cellular Handsets
  • Desktop Computers: Motherboards
  • GPIO
  • Industrial Control
  • Industrial Displays
  • Instrumentation and Test Measurement
  • Medical Equipment
  • RAID Systems
  • Servers
  • White LED Drivers
Part NumberInterfaceI/OReset InputOver Voltage Protection
Drive Current
minmaxSee Notes
MAX7310 Serial 2-Wire 400kbit8Yes5.5202.35.5
$2.21 @1k
See All I/O Port Expanders (31)
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.

Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

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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