SX1502I087TRT

Overview

The SX1502I087TRT is an 8-channel low voltage GPIO expander from Semtech, designed for battery-powered equipment. It features a standard I2C interface operating at up to 400kHz and supports independent supply rails (VDDM, VCC1, VCC2) ranging from 1.2V to 5.5V. The device provides true bi-directional I/O with programmable pull-up/pull-down resistors and push/pull outputs capable of up to 24mA sink current. Key specifications include a typical standby current of 1µA, an operating temperature range of -40°C to +85°C, and integrated power-on reset logic. It is housed in a QFN-UT-20 package.

Feature Summary

• Supports fully programmable logic functions (PLD) to reduce external logic gates
• Features open-drain active-low interrupt output (NINT) with bit-maskable edge sensitivity
• Includes Power-On Reset and dedicated reset input (NRESET)
• Provides level shifting capability between different voltage domains

Applications

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

Procurement Notes

Verify the specific ordering suffix 'I087' against the manufacturer's official documentation to confirm the QFN-UT-20 package variant. Ensure that the required I2C address configuration via the ADDR pin aligns with your system design, as this part utilizes a fixed or pin-selectable address scheme distinct from other family members.

Selection Notes

Select the SX1502I087TRT when eight programmable I/O channels are required within a compact footprint. This component is suitable for applications needing independent voltage levels for core and I/O banks. Consider the Boost Mode feature if higher sink currents are needed below the 2V threshold, ensuring the main supply voltage meets the boost requirements.

Part Context

This component belongs to the SX150x series, which includes the 4-channel SX1501 and the 16-channel SX1503. All models share similar architectural features, such as the I2C interface and PLD capabilities, but differ in channel count and package options. The SX1502 specifically bridges the gap between the minimal 4-channel and high-density 16-channel variants.

Replacement Considerations

The SX1501I087TRT serves as a compatible alternative if only four I/O channels are sufficient. For designs requiring sixteen channels, the SX1503I091TRT is the corresponding upgrade option within the same product family.