SX1504I087TRT

Overview

The SX1504I087TRT is a 4-channel General Purpose Input/Output (GPIO) expander designed for low-power handheld and battery-operated equipment. It expands I/O capabilities via a standard 400 kHz I2C interface, allowing serial control from a host microcontroller. The device features independent operating voltages: the core operates between 2.5V and 5.5V, while I/O banks support 2.5V to 5.5V. It includes programmable pull-up/pull-down resistors, push/pull outputs with up to 24mA sink capability on specific pins, and fully programmable logic functions (PLD). An active-low interrupt output (NINT) signals state changes, and a Power-On Reset ensures reliable startup.

Feature Summary

• Provides 4 bidirectional GPIO channels with programmable direction and pull-up/down configurations.
• Features fully programmable logic functions (PLD) to implement combinational logic and reduce external components.
• Supports independent voltage domains for the core and I/O banks, enabling level shifting between different voltage levels.
• Generates mask-programmable interrupts based on rising or falling edges of GPIO lines via an open-drain NINT pin.

Applications

• Cell phones and PDAs
• Digital cameras and portable multimedia players
• Notebooks and GPS units
• Industrial automation and ATE systems

Procurement Notes

Verify the package marking and date code against the manufacturer's latest documentation to ensure authenticity. Confirm that the QFN-UT-20 package dimensions match your PCB land pattern requirements. Ensure the ordering suffix corresponds to the correct tape and reel specifications for automated assembly processes.

Selection Notes

Select this component when only four additional GPIOs are required alongside existing system resources. Consider the SX1505 or SX1506 if more than four channels are needed. Verify that the application requires the specific PLD functionality or independent voltage domain support provided by this series before choosing over simpler fixed-function expanders.

Part Context

The SX1504I087TRT belongs to the SX1504/SX1505/SX1506 family of GPIO expanders from Semtech Corporation. These devices share a common architecture featuring I2C connectivity, programmable logic, and interrupt generation. The SX1504 specifically offers four channels in a compact QFN-UT-20 package, distinguishing it from the eight-channel SX1505 and sixteen-channel SX1506 variants.

Replacement Considerations

Direct substitutes within the same family include the SX1505I087TRT (8-channel) and SX1506I091TRT (16-channel), though pin counts differ. No other cross-family replacements are confirmed in public documentation.