MAX7323:I²C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os

Low Operating Supply Voltage I²C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os

The MAX7323 2-wire serial-interfaced peripheral features eight I/O ports. Four ports are push-pull outputs and the other four are open-drain I/O ports that are overvoltage protected up to +6V independent of the supply voltage. The four I/O ports configured as inputs are continuously monitored for state changes (transition detection). State changes are indicated by the open-drain active-low INT output. The interrupt is latched, allowing detection of transient changes. When the MAX7323 is subsequently accessed through the serial interface, any pending interrupt is cleared. The four push-pull and four open-drain outputs are rated to sink 20mA and are capable of driving LEDs. The active-low RST input clears the serial interface, terminating any I²C communication to or from the MAX7323. The MAX7323 uses two address inputs with four-level logic to allow 16 I²C slave addresses. The slave address also determines the power-up logic state for the I/O ports, and enables or disables internal 40kΩ pullups for the input ports in groups of two ports. The MAX7323 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 in the full data sheet). The MAX7323 is available in 16-pin QSOP and 16-pin TQFN packages, and is specified over the automotive temperature range (-40°C to +125°C).

Key Features
  • 400kHz I²C Serial Interface
  • +1.71V to +5.5V Operating Voltage
  • 4 Push-Pull Output Ports Rated at 20mA Sink Current
  • 4 Open-Drain I/O Ports Rated to 20mA Sink Current
  • 4 I/O Ports Are Overvoltage Protected to +6V
  • Transient Changes Are Latched, Allowing Detection Between Read Operations
  • Active-Low INT Output Alerts Change on Inputs
  • AD0 and AD2 Inputs Select from 16 Slave Addresses
  • Low 0.6µA (typ) Standby Current
  • -40°C to +125°C Operating Temperature Range
MAX7323: Typical Application Circuit
MAX7323: Typical Application Circuit
  • Cell Phones
  • Notebooks
  • RAID
  • Servers
titleDownload file
MAX7323 Data SheetMAX7323.pdf
Part NumberInterfaceI/OOutputsReset InputInterr.OutOver Voltage Protection
Drive Current
minmaxSee Notes
MAX7323Serial - I2C Compatible
Serial 2-Wire 400kbit
$1.78 @1k
Related Products
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Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX7323AEENo Longer AvailableMAX7323AEE+QSOP,;16 pin;30.9 mm²-40°C to +125°CNo
MAX7323AEE+ActiveQSOP,;16 pin;30.9 mm²-40°C to +125°CLead Free
MAX7323AEE+TActiveQSOP,;16 pin;30.9 mm²-40°C to +125°CLead Free
MAX7323AEE-TNo Longer AvailableMAX7323AEE+TQSOP;16 pin-40°C to +125°CSee data sheet
MAX7323ATENo Longer AvailableMAX7323ATE+TQFN,;16 pin;9.6 mm²-40°C to +125°CNo
MAX7323ATE+ActiveTQFN,;16 pin;9.6 mm²-40°C to +125°CLead Free
MAX7323ATE+TActiveTQFN,;16 pin;9.6 mm²-40°C to +125°CLead Free
MAX7323ATE-TNo Longer AvailableMAX7323ATE+TQFN;16 pin-40°C to +125°CSee data sheet
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