4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander
DescriptionThe MAX7301 compact, serial-interfaced I/O expander (or general-purpose I/O (GPIO) 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 either as 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 MAX7301 is controlled through an SPI-compatible 4-wire serial interface.
The MAX7301AAX and MAX7301ATL have 28 ports and are available in 36-pin SSOP and 40-pin TQFN packages, respectively. The MAX7301AAI has 20 ports and is available in a 28-pin SSOP package.
For a 2-wire I²C-interfaced version, refer to the MAX7300 data sheet.
For a pin-compatible port expander with additional 24mA constant-current LED drive capability, refer to the MAX6957 data sheet.
- Industry-Standard 4-Wire Interface Simplifies Expansion of I/O Ports to Up to 28 I/Os Independent of Microprocessor Architecture
- High-Speed, 26MHz, SPI-/QSPI™-/MICROWIRE®-Compatible Serial Interface
- 2.25V to 5.5V Operation
- 20 or 28 I/O Ports Configurable as Push-Pull Logic Output, Schmitt Logic Input or Schmitt Logic Input with Internal Pullup
- Logic Transition Detection for Seven I/O Ports
- Low Power Consumption Reduces Power-Supply Requirements
- 11µA (max) Shutdown Current
- Gaming Machines
- Industrial Controllers
- System Monitoring
- White Goods
|Part Number||Interface||I/O||Interrupt Output||Drive Current|
|MAX7301||Serial SPI 26Mbit||20 or 28||Yes||10||2.5||5.5|
Technical DocumentsApp Note 4021 MAX6956 Programming Guide
App Note 2852 Using a PC to Experiment with the MAX7300/MAX7301 Port Expanders
App Note 2199 Driving LEDs with Push-Pull Port Expander Outputs
App Note 1879 Using Maxim SPI-compatible Display Drivers with other SPI Peripherals
Tools & Models
|Device||Fab Process||Technology||Sample size||Rejects||FIT at 25°C||FIT at 55°C||Material Composition|
|App Note||4021||MAX6956 Programming Guide|
|App Note||2852||Using a PC to Experiment with the MAX7300/MAX7301 Port Expanders|
|App Note||2199||Driving LEDs with Push-Pull Port Expander Outputs|
|App Note||1879||Using Maxim SPI-compatible Display Drivers with other SPI Peripherals|