MAX7317ATE+

Overview

The MAX7317ATE+ is a 10-port serial-interfaced I/O expander from Analog Devices/Maxim Integrated, housed in a 16-pin TQFN-EP package. It operates on a supply voltage of 2.25V to 3.6V with a maximum clock frequency of 26MHz. The device features an industry-standard 4-wire SPI-compatible interface and provides 10 I/O ports rated to 7V. Each port can be individually configured as an open-drain output or an overvoltage-protected Schmitt input. Standby current is typically 0.7μA and maximally 1.9μA across the -40°C to +125°C operating temperature range.

Feature Summary

• Supports hot insertion with high-impedance state during power-down
• I/O ports withstand up to 8V when powered down
• Open-drain outputs allow level translation up to 7V
• Includes RAM register for general-purpose data storage

Applications

• Portable Equipment
• Cellular Phones
• White Goods
• Industrial Controllers
• System Monitoring

Procurement Notes

Verify the component matches the exact part number MAX7317ATE+. Confirm the package type is 16-pin TQFN-EP and the temperature range covers -40°C to +125°C. Ensure the datasheet revision aligns with your design requirements. Check for lead-free/RoHS compliance markings on the package top mark ACH.

Selection Notes

Select this component when expanding I/O ports via SPI without requiring interrupt outputs. It is suitable for systems needing overvoltage protection on inputs and outputs independent of the supply voltage. Consider the 26MHz interface speed and low standby current for power-sensitive applications. Verify that the open-drain architecture meets the load requirements.

Part Context

This device belongs to the MAX7317 series of SPI-interfaced I/O expanders. It is distinct from similar parts like the MAX6966/MAX6967, which include constant-current outputs and PWM controls. The MAX7317 focuses on general-purpose GPIO expansion with robust protection features, making it a specialized choice for simple port expansion tasks.

Replacement Considerations

Direct substitutes within the same family include the MAX7317AEE+, which uses a 16-pin QSOP package instead of TQFN. Both share identical electrical characteristics and functionality. When replacing, ensure the PCB footprint accommodates the specific package type selected.