MAX7306: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

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.

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
MAX7306, MAX7307: Typical Operating Circuit
MAX7306, MAX7307: Typical Operating Circuit
  • Cell Phones
  • LCD/Keypad Backlights
  • LED Status Indicators
  • System I/O Ports
titleDownload file
MAX7306-MAX7307 Data SheetMAX7306-MAX7307.pdf
Part NumberInterfaceI/OInputsOutputsReset InputInterr.OutOver Voltage Protection
Drive Current
MAX7306Serial - I2C Compatible
Serial 2-Wire 400kbit
Design kits & evaluation modules
Related Products
  • MAX7302:SMBus/I²C Interfaced 9-Port, Level-Translating GPIO and LED Driver with CLA
  • MAX6964:17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection
  • MAX6965:9-Output LED Driver with Intensity Control and Hot-Insertion Protection
  • MAX7300:2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander
  • MAX6956:2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander
  • MAX7301:4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander
  • MAX6957:4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port LED Display Driver and I/O Expander
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX7306ALB+ActiveµDFN,;10 pin;4.2 mm²-40°C to +125°CLead Free
MAX7306ALB+TActiveµDFN,;10 pin;4.2 mm²-40°C to +125°CLead Free
MAX7306AUB+ActiveµMAX-EP,;10 pin;26 mm²-40°C to +125°CLead Free
MAX7306-MAX7307.pdf MAX7306
Demonstrating Green Technology with Apples, Oranges, Lemons, and Limes DS80CH11
MAX7306-MAX7307.pdf MAX7307