MAX7314ATG

Overview

The MAX7314ATG is an I²C-compatible serial interface peripheral providing 18 ports: 16 configurable I/O, one output-only, and one input-only. Each I/O port functions as a 50mA open-drain current-sinking output rated at 5.5V or a logic input with transition detection. The device supports hot insertion, featuring high-impedance pins during power-off. It includes 8-bit PWM LED intensity control with global and individual settings, two-phase blinking, and interrupt generation. Operating voltage ranges from 2V to 3.6V, with inputs overvoltage protected to 5.5V. Typical operating current is 1.2µA.

Feature Summary

• I²C-compatible serial interface supporting 400kbps data rates
• Integrated 8-bit PWM LED intensity control with global and individual adjustment
• Hot-insertion protection with 5.5V tolerant I/O ports
• Transition detection capability with dedicated interrupt output

Applications

• LCD backlighting systems
• LED status indication circuits
• Keypad backlight drivers
• RGB LED driver modules
• General system I/O expansion

Procurement Notes

Verify the ATG suffix indicates the specific thin QFN package variant (4mm x 4mm) and industrial temperature range (-40°C to +125°C). Confirm the component source is Maxim Integrated or Analog Devices to ensure authenticity. Check for RoHS compliance markings on the physical device. Validate that the part number matches the exact pinout and electrical specifications required for the design.

Selection Notes

Select this component when an I²C GPIO expander with integrated LED brightness control is required. It is suitable for designs needing 5.5V tolerant inputs/outputs while operating from a lower core voltage. Consider the small QFN package for space-constrained layouts. Ensure the application utilizes the interrupt feature for efficient transition detection rather than polling.

Part Context

The MAX7314 series expands microprocessor I/O capabilities via a standard two-wire serial interface. It combines general-purpose I/O with specialized LED driving features, reducing external component count. The device integrates current sinks and PWM controls, eliminating the need for separate drivers in many low-power applications.

Replacement Considerations

Verify compatibility with existing I²C address configurations if substituting other MAX73xx variants. Ensure the replacement supports the same 5.5V tolerance and 50mA sink current requirements. Check package dimensions against the 4mm x 4mm QFN footprint.