MAX7312

19-3057; Rev 0; 10/03 2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection General Description The MAX7312 2-wire-interfaced expander provides 16-bit parallel input/output (I/O) port expansion in SMBus™ and I2C™ applications. The MAX7312 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 MAX7312 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 an output. A power-on reset (POR) initializes the 16 I/Os as inputs. Three address select pins configure the part to one of 64 slave ID addresses. The MAX7312 supports hot insertion. All port pins, the INT output, SDA, SCL, and the slave address inputs AD0-2 remain high impedance in power-down (Vt = 0V) up to 6V. The MAX7312 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 with integrated 100kΩ pullup resistors, refer to the MAX7311 data sheet. o 2V to 5.5V Operation o 5V Overvoltage Tolerant I/Os o Supports Hot Insertion o 16 I/O Pins that Default to Inputs on Power-Up o Open-Drain Interrupt Output (INT) o Bus Timeout for Lock-Up-Free O...