SMBus/I²C Interfaced 4-Port, Level-Translating GPIOs and LED Drivers

Low Operating Supply Voltage LED Drivers with Blinking, Transition Detection, and Level Translation in a Very Small Package Ideal for Cellular and Smartphone Applications

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The MAX7306/MAX7307 I²C-/SMBus™-compatible, serial-interfaced peripherals feature four level-translating I/Os and operate from a 1.62V to 3.6V power supply. The MAX7307 features a port supply (VLA) that allows level translation on I/O ports to operate from a separate power supply from 1.4V to 5.5V. The MAX7306 features an address select input (AD0) to allow up to four unique slave addresses.

The MAX7306/MAX7307 ports P2, P3, and P4 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 active-low INT output. Ports P2 and P3 can be configured as OSCIN and OSCOUT, respectively. The MAX7306/MAX7307 include an internal oscillator for PWM, blink, and key debounce, or to cascade multiple MAX7306/MAX7307s. 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 MAX7306/MAX7307.

All ports configured as output feature 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 1/8 second, 1/4 second, 1/2 second, 1, 2, 4, or 8 seconds. Any port can blink during this period with a 1/16 to 15/16 duty cycle.

The MAX7306/MAX7307 are specified over the -40°C to +125°C temperature range and are available in 10-pin µDFN (2mm x 2mm) and 10-pin µMAX® packages.
MAX7306, MAX7307: Typical Operating Circuit MAX7306, MAX7307: Typical Operating Circuit Enlarge+

Key Features

  • 1.4V to 5.5V I/O Level Translation Port Supply (VLA)
  • 1.62V to 3.6V Power Supply
  • Four Individually Configurable GPIO Ports
    • P1 = Open-Drain I/O
    • P2, P3, P4 = Push-Pull or Open-Drain I/O
  • 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
  • Active-Low RST Input Clears Serial Interface, Can Restore Power-Up Default State, and Synchronizes Blink Timing
  • Oscillator Input and Output Enables Cascading Multiple Devices
  • Low 0.75µA (typ) Standby Current


  • Cell Phones
  • LCD/Keypad Backlights
  • LED Status Indicators
  • System I/O Ports
Part NumberInterfaceI/OInputsOutputsReset InputInterr.OutOver Voltage Protection
Drive Current
Serial - I2C Compatible
Serial 2-Wire 400kbit
See All I/O Port Expanders (31)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX7306EVCMAXQU: MAX7306 Evaluation Kit/Evaluation System
MAX7306EVKIT: MAX7306 Evaluation Kit/Evaluation System
MAX7307EVCMAXQU: Evaluation Kit/Evaluation System for the MAX7307
MAX7307EVKIT: Evaluation Kit/Evaluation System for the MAX7307

Technical Documents

App Note 4634 Adding Edge-Sensitive Transition Detection to GPIO Devices
App Note 4427 Demonstrating Green Technology with Apples, Oranges, Lemons, and Limes

Quality and Environmental Data

Request Reliability Report for: MAX7306 
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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