Maxim's MAX7310 general-purpose I/O expander interfaces the 2-wire, SMBus/I2C-compatible serial interface of microprocessor and microcontrollers to eight I/O ports. Packaged in 16-pin TSSOP, QSOP, and QFN packages, all eight ports power up as inputs but can be configured by the master as either an input or output. Capable of sinking up to 30 mA, each I/O port has fixed logic thresholds compatible with 2,5, 3,3 and 5,5 V logic levels. I/O port 0 is a 5 V tolerant, open-drain output for logic-level translation. The MAX7310 has an input port register, an output port register, a configuration register, a bus timeout register, and a polarity inversion register, all communicated through the 400 kHz 2-wire, I2C-compatible serial interface. For lock-up-free operation
the SMBus timeout function alerts the master when the bus times out (it can be disabled in software). The MAX7310 operates from a 2,3 to 5,5 V supply over -40 to +125°C; average supply current is 29 µA, standby is 1,7 µA.
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