SX1501I087TRT

Overview

The SX1501I087TRT is a 4-channel low voltage GPIO expander from Semtech, designed for battery-powered equipment. It features an I2C interface operating at up to 400kHz and supports independent supply rails (VDDM, VCC1) 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

• Fully programmable logic functions (PLD) allowing implementation of combinational logic gates to reduce external components
• Open-drain active-low interrupt output (NINT) with bit-maskable edge sensitivity detection
• Independent voltage level shifting capability between core and I/O banks
• Ultra-low current consumption suitable for portable applications

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 against the manufacturer's latest documentation to ensure correct packaging and revision status. Confirm that the QFN-UT-20 package dimensions align with your PCB land pattern requirements. Ensure the selected variant matches the required channel count and pinout configuration for your design.

Selection Notes

Select this component when the host microcontroller requires additional general-purpose inputs or outputs beyond its native capacity. It is particularly suitable for designs requiring voltage translation between different logic levels or those needing hardware-based logic reduction through internal PLD capabilities. Consider the I2C address constraints if multiple devices are used on the same bus.

Part Context

This part belongs to the SX150x series of ultra-low voltage GPIO expanders, which also includes the 8-channel SX1502 and 16-channel SX1503 models. All members share a similar architecture and register map but differ in channel count and package options. The SX1501 specifically targets applications requiring minimal I/O expansion in space-constrained environments.

Replacement Considerations

Direct replacements within the family include the SX1502I087TRT for 8-channel expansion in the same package. For TSSOP-20 package variants, consider the SX1501I088TRT. Verify pin compatibility and register mapping before substituting.