I/O Port Expander 24-Pin SSOP

The MAX7311 2-wire-interfaced expander provides 16-bit parallel input/output (I/O) port expansion for SMBus and I²C applications. The MAX7311 consists of input port registers, output port registers, polarity inversion registers, configuration registers, a bus timeout register, and an I²C-compatible serial interface logic compatible with SMBus. The system master can invert the MAX7311 input data by writing to the active-high polarity inversion register. The system master can enable or disable bus timeout by writing to the bus timeout 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 MAX7311 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 MAX7311 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 I/Os without pullup resistors, refer to the MAX7312 data sheet.

• 400kbps I²C-Compatible Serial Interface
• 2V to 5.5V Operation
• 5V Overvoltage Tolerant I/Os
• Supports Hot Insertion
• 16 I/O Pins that Default to Inputs on Power-Up
• 100kO Pullup on Each I/O
• Open-Drain Interrupt Output (Active-Low INT)
• Bus Timeout for Lock-Up-Free Operation
• Noise Filter on SCL/SDA Inputs
• 64 Slave ID Addresses Available
• Low Standby Current (2.9µA typ)
• Polarity Inversion
• 4mm x 4mm, 0.8mm Thin QFN Package
• -40°C to +125°C Operation