MAX7312

Features:

 400kbps I2C-Compatible Serial Interface
2V to 5.5V Operation
5V Overvoltage Tolerant I/Os
Supports Hot Insertion
16 I/O Pins that Default to Inputs on Power-Up
Open-Drain Interrupt Output ( INT)
Bus Timeout for Lock-Up-Free Operation
Noise Filter on SCL/SDA Inputs
64 User-Selectable Slave ID Addresses
Low Standby Current (2.9µA typ)
Polarity Inversion
4mm *4mm, 0.8mm Thin QFN Package
-40°C to +125°C Operation


Application

Servers/Blades
RAID Systems
Medical Equipment
Instrumentation and Test Measurement
Networking


Pinout

Specifications

V+ to GND ..................................................................-0.3V to +6V
I/O0I/O15 as Inputs ....................................(GND - 0.3V) to +6V
SCL, SDA, AD0, AD1, AD2, INT..........................(GND - 0.3V) to +6V
Maximum V+ Current .........................................................+250mA
Maximum GND Current ........................................................-250mA
DC Input Current on I/O0I/O15.........................................±20mA
DC Output Current on I/O0I/O15 ......................................±80mA


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 regis-ters, 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 regis-ter. The system master can enable or disable bus timeout by writing to the bus timeout register.

Any of the 16 I/O ports of MAX7312 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 (V_t = 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.