Data Sheet Rev. 3
CN Rev. 3 | JP Rev. 3

Overview

Features and Benefits

  • 400kbps I²C-Compatible Serial Interface
  • 2V to 5.5V Operation
  • 5V Overvoltage Tolerant I/Os
  • Supports Hot Insertion
  • 16 I/O Pins that Default to Inputs on Power-Up
  • Open-Drain Interrupt Output (Active-Low INT)
  • Bus Timeout for Lock-Up-Free Operation
  • Noise Filter on SCL/SDA Inputs
  • 64 User-Selectable Slave ID Addresses
  • Low Standby Current (2.9µA typ)
  • Polarity Inversion
  • 4mm x 4mm, 0.8mm Thin QFN Package
  • -40°C to +125°C Operation

Product Details

The MAX7312 2-wire-interfaced expander provides 16-bit parallel input/output (I/O) port expansion in SMBus™ and I²C applications. The MAX7312 consists of input port registers, output port registers, polarity inversion registers, configuration registers, a bus timeout register, and an I²C-compatible serial interface logic, compatible with SMBus. The system master can invert the MAX7312 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 16 I/O ports can be configured as an input or an output. A power-on reset (POR) initializes the 16 I/Os as inputs. Three address select pins configure the part to one of 64 slave ID addresses.

The MAX7312 supports hot insertion. All port pins, the active-low INT output, SDA, SCL, and the slave address inputs AD0-2 remain high impedance in power-down (Vt = 0V) up to 6V.

The MAX7312 is available in 24-pin SO, SSOP, TSSOP, and thin QFN packages and is specified over the -40°C to +125°C automotive temperature range.

For applications requiring I/Os with integrated 100kΩ pullup resistors, refer to the MAX7311 data sheet.

Applications

  • Instrumentation and Test Measurement Networking
  • Medical Equipment
  • RAID Systems
  • Servers/Blades

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Documentation & Resources

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  • Data Sheets (1)
  • Reliability Data (1)
  • Design Notes (1)
  • Technical Articles (2)
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    Tools & Simulations

    Software Development

    MAX7312 I/O Port Expander EV Kit SW, 1.0.0
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    MAX7312 Companion Parts

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    Design Resources

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