MAXIM MAX7300ATI

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 TQFN packages, respectively. The MAX7300AAI and MAX7300ATI have 20 ports and are available in 28-pin SSOP and TQFN packages. The MAX7300 general-purpose input/output (GPIO) peripheral provides up to 28 I/O ports, P4 to P31, controlled through an I²C-compatible serial interface. The ports can be configured to any combination of logic inputs and logic outputs, and default to logic inputs on power-up. Any I/O port can be configured as a push-pull output (sinking 10mA, sourcing 4.5mA), or a Schmitt-trigger logic input. Each input has an individually selectable internal pullup resistor. Additionally, transition detection allows seven ports (P24 to P30) to be monitored in any maskable combination for changes in their logic status. A detected transition is flagged through a status register bit, as well as an interrupt pin (port P31), if desired. The port configuration registers individually set the 28 ports, P4 to P31, as GPIO. A pair of bits in registers 0x09 through 0x0F sets each port’s config

• 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

• White Goods System Monitoring
• Industrial Controllers