The MAX7311 is a 2-wire-interfaced expander that provides 16-bit parallel input/output (I/O) port expansion for SMBus and I2C applications. It includes 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 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 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 provides 16 parallel I/O pins that can be individually configured as inputs or outputs via an SMBus™/I²C‑compatible serial interface. It includes features such as polarity inversion, bus timeout, open‑drain interrupt output, and supports hot insertion. Three address pins allow selection of one of 64 slave IDs, making it suitable for server, RAID, industrial control, medical, and PLC applications.
The device operates from 2 V to 5.5 V, with a standby current as low as 2.9 pA and a typical pull‑up of 100 kΩ on each I/O. It is offered in 24‑pin SO, SSOP, TSSOP, and thin QFN packages and is qualified for the –40 °C to +125 °C automotive temperature range.
| Supply Voltage | 2 V to 5.5 V |
|---|---|
| Operating Temperature Range | -40 °C to +125 °C |
| Number of I/O Pins | 16 |
| Interrupt Output | Open‑Drain |
| I²C Clock Frequency | 400 kHz |
| Slave ID Addresses | 64 |
| Standby Current | 2.9 pA typ |
| Pull‑up Resistor per I/O | 100 kΩ |
| Package Options | 24‑pin SO, SSOP, TSSOP, thin QFN |
The device is specified for operation up to +125 °C.
It provides 16 I/O pins that default to inputs on power‑up.
The MAX7311 supports a 400 kHz I²C‑compatible serial interface.
Three address pins allow selection of one of 64 slave ID addresses.