The MAX7318 2-wire-interfaced expander provides 16-bit parallel input/output (I/O) port expansion for SMBus™ and I2C applications. The MAX7318 consists of input port registers, output port registers, polarity inversion registers, configuration registers, and an I2C-compatible serial interface logic compatible with SMBus. The system master can invert the MAX7318 input data by writing to the active-high polarity inversion register. Any of the 16 I/O ports can be configured as an input or output. A power-on reset (POR) initializes the 16 I/Os as inputs. Three address select pins configure one of 64 slave ID addresses. The MAX7318 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 MAX7318 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 an SMBus timeout function, refer to the MAX7311 data sheet.
The MAX7318 provides 16‑bit parallel input/output (I/O) port expansion for SMBus™ and I²C applications. It includes input, output, polarity inversion and configuration registers, and an I²C‑compatible serial interface that can be used by a microcontroller master.
Key features include operation over a -40 °C to +125 °C automotive temperature range, support for hot insertion, up to 64 selectable slave IDs, and low standby current (5.4 µA typical at 3.3 V). The device is offered in 24‑pin SO, SSOP, TSSOP and thin QFN packages.
| Supply Voltage (V+) | 2.0 V – 5.5 V |
|---|---|
| Operating Temperature Range | -40 °C to +125 °C |
| Number of I/O Pins | 16 |
| Maximum V+ Current | 250 mA |
| Package Options | 24‑pin SO, SSOP, TSSOP, Thin QFN |
The device operates from 2.0 V to 5.5 V supply voltage.
It provides 16 I/O pins that can be configured as inputs or outputs.
Three address pins allow selection of up to 64 slave ID addresses.
Yes, the MAX7318 supports hot insertion.