SMBus/I²C Interfaced 9-Port, Level-Translating GPIO and LED Driver with CLA

Low Operating Supply Voltage LED Driver
with Blinking, PWM, Transition Detection, and Level Translation

Please check latest availability status for a specific part variant.


The MAX7302 I²C-/SMBus™-compatible, serial-interfaced peripheral features 9 level-translating I/Os, and operates from a 1.62V to 3.6V power supply. The MAX7302 features a port supply VLA that allows level-translation on I/O ports to operate from a separate power supply from 1.62V to 5.5V. An address select input, AD0, allows up to four unique slave addresses for the device.

The MAX7302 ports P2–P9 can be configured as inputs, push-pull outputs, and open-drain outputs. Port P1 can be configured as a general-purpose input, open-drain output, or an open-drain INT output. Ports P2–P9 can be configured as OSCIN and OSCOUT, respectively. Ports P2–P9 can also be used as configurable logic arrays (CLAs) to form user-defined logic gates, replacing external discrete gates. Outputs are capable of sinking up to 25mA, and sourcing up to 10mA when configured as push-pull outputs.

The MAX7302 includes an internal oscillator for PWM, blink, and key debounce, or to cascade multiple MAX7302s. The external clock can be used to set a specific PWM and blink timing. The active-low RST input asynchronously clears the 2-wire interface and terminates a bus lockup involving the MAX7302.

All ports configured as an output feature a 33-step PWM, allowing any output to be set from fully off, 1/32 to 31/32 duty cycle, to fully on. All output ports also feature LED blink control, allowing blink periods of 1/8s, 1/4s, 1/2s, 1s, 2s, 4s, or 8s. Any port can blink during this period with a 1/16 to 15/16 duty cycle.

The MAX7302 is specified over the -40°C to +125°C temperature range and is available in 16-pin QSOP and 16-pin TQFN (3mm x 3mm) packages.
MAX7302: Typical Operating Circuit MAX7302: Typical Operating Circuit Enlarge+

Key Features

  • 1.62V to 5.5V I/O Level-Translation Port Supply (VLA)
  • 1.62V to 3.6V Power Supply
  • 9 Individually Configurable GPIO Ports
    • P1 Open-Drain I/O
    • P2–P9 Push-Pull or Open-Drain I/Os
  • Individual 33-Step PWM Intensity Control
  • Blink Controls with 15 Steps on Outputs
  • 1kHz PWM Period Provides Flicker-Free LED Intensity Control
  • 25mA (max) Port Output Sink Current (100mA max Ground Current)
  • Inputs Overvoltage Protected Up to 5.5V (VLA)
  • Transition Detection with Optional Interrupt Output
  • Optional Input Debouncing
  • I/O Ports Configurable as Logic Gates (CLA)
  • External Active-Low RST Input
  • Oscillator Input and Output Enable Cascading Multiple Devices
  • Low 0.75µA (typ) Standby Current


  • Cell Phones
  • LCD/Keypad Backlights
  • LED Status Indicators
  • Servers
  • System I/O Ports

Technical Documents

App Note 4634 Adding Edge-Sensitive Transition Detection to GPIO Devices

Quality and Environmental Data

Request Reliability Report for: MAX7302 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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