MAX7327:I²C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os

The MAX7327, a 2-wire serial-interfaced peripheral, features 12 push-pull outputs and four configurable open-drain I/O ports with selectable internal pullups and transition detection. Ports are overvoltage protected to +6V, independent of 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, +6V-tolerant active-low INT output. The interrupt is latched, detecting transient changes. When the MAX7327 is subsequently accessed through the serial interface, any pending interrupt is cleared. The 12 push-pull and the 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 MAX7327. The MAX7327 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 in groups of two ports. The MAX7327 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 MAX7327 is available in the 24-pin QSOP and TQFN packages, and is specified over the -40°C to +125°C automotive temperature range.

Key Features
  • 400kHz I²C Serial Interface
  • +1.71V to +5.5V Operating Voltage
  • 12 Push-Pull Output Ports, Rated at 20mA Sink Current
  • 4 Open-Drain I/O Ports, Rated at 20mA Sink Current
  • I/O Ports are Overvoltage Protected to +6V
  • Selectable I/O Port Power-Up Default Logic States
  • Transient Changes are Latched, Allowing Detection Between Read Operations
  • Active-Low INT Output Alerts Changes on Inputs
  • AD0 and AD2 Inputs Select from 16 Slave Addresses
  • Low 0.6µA (typ) Standby Current
  • -40°C to +125°C Temperature Range
MAX7327: Typical Application Circuit
MAX7327: Typical Application Circuit
  • Cell Phones
  • Notebooks
  • Satellite Radio
  • Servers
titleDownload file
MAX7327 Data SheetMAX7327.pdf
Part NumberInterfaceI/OOutputsReset InputInterr.OutOver Voltage Protection
Drive Current
minmaxSee Notes
MAX7327Serial - I2C Compatible
Serial 2-Wire 400kbit
$1.92 @1k
Design kits & evaluation modules
Related Products
  • MAX7323:I²C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os
  • MAX7322:I²C Port Expander with 4 Push-Pull Outputs and 4 Inputs
  • MAX7320:I²C Port Expander with Eight Push-Pull Outputs
  • MAX7328:I²C Port Expanders with Eight I/O Ports
  • MAX7329:I²C Port Expanders with Eight I/O Ports
  • MAX7319:I²C Port Expander with Eight Inputs and Maskable Transition Detection
  • MAX7321:I2C Port Expander with 8 Open-Drain I/Os
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX7327AATG+ActiveTQFN,;24 pin;13 mm²-40°C to +125°CLead Free
MAX7327AATG+TActiveTQFN,;24 pin;13 mm²-40°C to +125°CLead Free
MAX7327AEGNo Longer AvailableQSOP,;24 pin;54.2 mm²-40°C to +125°CNo
MAX7327AEG-TNo Longer AvailableQSOP;24 pin-40°C to +125°CSee data sheet
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