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

Product Details

Key Features

Applications/Uses

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)
2.58
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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)
2.58

Key Features

  • 400kbps I²C-Compatible Serial Interface
  • 2V to 5.5V Operation
  • 5.5V Overvoltage-Tolerant I/Os
  • Supports Hot Insertion
  • 16 I/O Pins that Default to Inputs on Power-Up
  • 100kΩ Pullup on Each I/O
  • Open-Drain Interrupt Output (Active-Low INT)
  • Noise Filter on SCL/SDA Inputs
  • 64 Slave ID Addresses Available
  • Low Standby Current (5.4µA typ)
  • Polarity Inversion
  • 4mm x 4mm, 0.8mm Thin QFN Package
  • -40°C to +125°C Operation

Applications/Uses

  • Industrial Control
  • Instrumentation and Test Measurement
  • Medical Equipment
  • PLCs
  • RAID Systems
  • Servers

Description

The MAX7318 2-wire-interfaced expander provides 16-bit parallel input/output (I/O) port expansion for SMBus™ and I²C applications. The MAX7318 consists of input port registers, output port registers, polarity inversion registers, configuration registers, and an I²C-compatible serial interface logic compatible with SMBus. The system master can invert the MAX7318 input data by writing to the active-high polarity inversion register.

Any of the 16 I/O ports can be configured as an input or output. A power-on reset (POR) initializes the 16 I/Os as inputs. Three address select pins configure one of 64 slave ID addresses.

The MAX7318 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 (V+ = 0V) with up to 6V asserted upon them.

The MAX7318 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 an SMBus timeout function, refer to the MAX7311 data sheet.

Simplified Block Diagram

MAX7318: Block Diagram MAX7318: Block Diagram Zoom icon

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 .