Top

I²C Port Expanders with Eight I/O Ports

Product Details

Key Features

Parametric specs for I/O Port Expanders
Interface Serial - I2C Compatible
Serial 2-Wire 400kbit
I/O 8
Interrupt Output Yes
Over Voltage Protection (V) 5.5
Drive Current (mA) 25
VSUPPLY (V) (min) 2.5
VSUPPLY (V) (max) 5.5
Package/Pins SOIC (W)/16
SSOP/20
Budgetary
Price (See Notes)
2.03
View Less

Simplified Block Diagram

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 .

Parameters

Parametric specs for I/O Port Expanders
Interface Serial - I2C Compatible
Serial 2-Wire 400kbit
I/O 8
Interrupt Output Yes
Over Voltage Protection (V) 5.5
Drive Current (mA) 25
VSUPPLY (V) (min) 2.5
VSUPPLY (V) (max) 5.5
Package/Pins SOIC (W)/16
SSOP/20
Budgetary
Price (See Notes)
2.03

Key Features

  • 100kHz, 5.5V-Tolerant, I2C-Compatible Serial Interface
  • 2.5V to 5.5V Operating Supply Voltage Range
  • Low-Standby-Current Consumption of 10µA (max)
  • I2C Bus-to-Parallel-Port Expander
  • Open-Drain Interrupt Output Active-Low INT
  • 8-Bit Remote I/O Port for the I2C Bus
  • Latched Outputs with High-Current-Drive Capability for Directly Driving LEDs
  • Address by Three Hardware Address Pins for Use of Up to Eight Devices (Up to 16 Using Both MAX7328/MAX7329)
  • Second Sources to PCF8574 and PCF8574A

Applications/Uses

  • Industrial
  • Notebooks
  • RAID
  • Servers

Description

The MAX7328/MAX7329 are 2-wire serial-interfaced peripherals with eight I/O ports. Any port can be used as a logic input or an open-drain output.

All input ports are continuously monitored for state changes (transition detection). Transitions are alerted through the open-drain, 5.5V-tolerant active-low INT output.

The MAX7328 and MAX7329 versions differ only by their slave ID address ranges. The MAX7328 has a slave ID range of 0100xxx (0x20 to 0x27). The MAX7329 has a slave ID range of 0111xxx (0x38 to 0x3F).

For a similar part with overvoltage-protected I/Os and a bus active-low RST input that clears the I²C serial interface, refer to the MAX7321 data sheet. The MAX7328/MAX7329 are members of a family of pin-compatible port expanders with a choice of input ports, open-drain I/O ports, and push-pull output ports (see the Selector Guide in the full data sheet).

Simplified Block Diagram

MAX7328, MAX7329: Typical Application Circuit MAX7328, MAX7329: Typical Application Circuit 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 .