The MAX7321 2-wire serial-interfaced peripheral features eight open-drain I/O ports with selectable internal pullups and transition detection. Any port may be used as a logic input or an open-drain output. Ports are overvoltage protected to +6V independent of supply voltage. All I/O ports configured as inputs are continuously monitored for state changes (transition detection). State changes are indicated by the open-drain, active-low INT output. The interrupt is latched, allowing detection of transient changes. When the MAX7321 is subsequently accessed through the serial interface, any pending interrupt is cleared. The open-drain outputs are rated to sink 20mA and are capable of driving LEDs. The +6V tolerant active-low RST input clears the serial interface, terminating any I2C communication to or from the MAX7321. The MAX7321 uses two address inputs with four-level logic to allow 16 I2C slave addresses. The slave address also determines the power-up logic state for the I/O ports, and enables or disables internal 40kΩ pullups in groups of four ports. The MAX7321 is one device in a family of pin-compatible port expanders with a choice of input ports, open-drain I/O ports, and push-pull output ports. The MAX7321 is available in 16-pin QSOP and TQFN packages, and is specified over the automotive temperature range (-40°C to +125°C). Applications * Cell Phones * Notebooks * SAN/NAS * Satellite Radio * Servers * 400kHz I2C Serial Interface * +1.71V to +5.5V Operating Voltage * 8 Open-Drain I/O Ports Rated to 20mA Sink Current * I/O Ports Are Overvoltage Protected to +6V * Any Port Can Be a Logic Input or an Open-Drain Output * Selectable I/O Port Power-Up Default Logic States * Transient Changes Are Latched, Allowing Detection Between Read Operations * active-low INT Output Alerts Change on Inputs * AD0 and AD2 Inputs Select from 16 Slave Addresses * Low 0.6µA (typ) Standby Current * -40°C to +125°C Operating Temperature https://elecena.pl/product/22332819/ic-port-expander-with-8-open-drain-i-os 2022-12-28 https://elecena.pl/product/22332819/ic-port-expander-with-8-open-drain-i-os 2025-01-21