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2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection

Product Details

Key Features

Parametric specs for I/O Port Expanders
Interface Serial 2-Wire 400kbit
I/O 16
Interrupt Output Yes
Over Voltage Protection (V) 5.5
Drive Current (mA) 40
VSUPPLY (V) (min) 2
VSUPPLY (V) (max) 5.5
Package/Pins SOIC (W)/24
SSOP/24
TQFN/24
TSSOP/24
Budgetary
Price (See Notes)
2.63
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Simplified Block Diagram

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Parameters

Parametric specs for I/O Port Expanders
Interface Serial 2-Wire 400kbit
I/O 16
Interrupt Output Yes
Over Voltage Protection (V) 5.5
Drive Current (mA) 40
VSUPPLY (V) (min) 2
VSUPPLY (V) (max) 5.5
Package/Pins SOIC (W)/24
SSOP/24
TQFN/24
TSSOP/24
Budgetary
Price (See Notes)
2.63

Key Features

  • 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

Applications/Uses

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

Description

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.

Simplified Block Diagram

MAX7312: Block Diagram MAX7312: Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .