MAX7319

The MAX7319 2-wire serial-interfaced peripheral features eight input ports with selectable internal pullups, overvoltage protection to +6V, and transition detection with interrupt output.

All input ports of MAX7319 are continuously monitored for state changes (transition detection). Transitions are latched, allowing detection of transient changes. Any combination of inputs can be selected using the interrupt mask to assert the INT output. When the MAX7319 is subsequently accessed through the serial interface, any pending interrupt is cleared.

The +5.5V tolerant RST input clears the serial interface, terminating any I2C communication to or from the MAX7319.

The MAX7319 uses two address inputs with four-level logic to allow 16 I2C slave addresses. The slave address also enables or disables internal 40k pullups in groups of four ports.

The MAX7319 supports hot insertion. All eight input ports, the serial interface SDA, SCL, AD0, AD2, INT, and RST remain high impedance in power-down (V+ = 0) with up to +6V asserted on them.

The MAX7319 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 (see Table 1). The MAX7319 is available in 16-pin QSOP and 16-pin TQFN packages, and is specified over the automotive temperature range (-40°C to +125°C).