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2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander

Product Details

Key Features

Parametric specs for I/O Port Expanders
Interface Serial 2-Wire 400kbit
I/O 20 or 28
Interrupt Output Yes
Drive Current (mA) 10
VSUPPLY (V) (min) 2.5
VSUPPLY (V) (max) 5.5
Package/Pins SSOP/28
SSOP/36
TQFN/40
Budgetary
Price (See Notes)
3.74
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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 20 or 28
Interrupt Output Yes
Drive Current (mA) 10
VSUPPLY (V) (min) 2.5
VSUPPLY (V) (max) 5.5
Package/Pins SSOP/28
SSOP/36
TQFN/40
Budgetary
Price (See Notes)
3.74

Key Features

  • 400kbps I²C-Compatible Serial Interface
  • 2.5V to 5.5V Operation
  • -40°C to +125°C Temperature Range
  • 20 or 28 I/O Ports, Each Configurable as
    • Push-Pull Logic Output
    • Schmitt Logic Input
    • Schmitt Logic Input with Internal Pullup
  • 11µA (max) Shutdown Current
  • Logic Transition Detection for Seven I/O Ports

Applications/Uses

  • Industrial Controllers
  • System Monitoring
  • White Goods

Description

The MAX7300 compact, serial-interfaced, I/O expansion peripheral provides microprocessors with up to 28 ports. Each port is individually user configurable to either a logic input or logic output.

Each port can be configured as either a push-pull logic output capable of sinking 10mA and sourcing 4.5mA, or a Schmitt logic input with optional internal pullup. Seven ports feature configurable transition detection logic, which generates an interrupt upon change of port logic level. The MAX7300 is controlled through an I²C-compatible 2-wire serial interface, and uses four-level logic to allow 16 I²C addresses from only two select pins.

The MAX7300AAX and MAX7300ATL have 28 ports and are available in 36-pin SSOP and 40-pin thin QFN packages, respectively. The MAX7300AAI and MAX7300ATI have 20 ports and are available in 28-pin SSOP and thin QFN packages. For an SPI™-interfaced version, refer to the MAX7301 data sheet. For a pin-compatible port expander with additional 24mA constant-current LED drive capability, refer to the MAX6956 data sheet.

Simplified Block Diagram

MAX7300: Typical Operating Circuit MAX7300: Typical Operating 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 .