SX1503I091TRT

Overview

The SX1503I091TRT is a 16-channel low voltage General Purpose Input/Output (GPIO) expander designed for battery-powered equipment. It features an ultra-low current consumption of typically 1µA and operates with independent supply rails: VDDM from 1.2V to 5.5V, and I/O banks (VCC1, VCC2) from 1.2V to 5.5V. The device communicates via a standard 400kHz I²C interface and includes an open-drain active low interrupt output (NINT). It supports programmable pull-up/pull-down resistors, push/pull outputs, and fully programmable logic functions (PLD). The component is housed in a QFN-UT-28 package and rated for operation between -40°C and +85°C.

Feature Summary

• Independent operating voltages allow the core to run at 1.2V while I/O banks operate up to 5.5V, facilitating level shifting between different voltage domains.
• Integrated programmable logic functions enable complex combinational logic implementation, reducing the need for external discrete logic gates.
• Mask-programmable interrupts detect rising or falling edges on any GPIO line, providing efficient state change monitoring for host controllers.

Applications

• Cell phones, PDAs, and MP3 players
• Digital cameras and portable multimedia players
• Notebooks and GPS units
• Industrial automation and automated test equipment

Procurement Notes

Verify that the specific ordering code matches the required package type, as the SX1503 family is available in both QFN-UT-28 and TSSOP-28 variants. Confirm the suffix indicates the correct channel count and pinout configuration. Ensure compliance with RoHS and WEEE standards if applicable to your manufacturing requirements. Cross-reference the datasheet revision date to ensure compatibility with your design specifications.

Selection Notes

Select this component when a microcontroller requires expansion beyond its native I/O capacity, particularly in systems where serial control from a remote location is beneficial. Choose this part over the SX1501 or SX1502 if sixteen independent channels are necessary. Consider the PLD capabilities if the application demands custom logic gating to minimize external component count. Verify that the I²C address configuration meets the system's bus addressing requirements.

Part Context

The SX1503 serves as the 16-channel variant within the SX1501/SX1502/SX1503 series of ultra-low voltage GPIO expanders. While the SX1501 provides four channels and the SX1502 offers eight, the SX1503 delivers sixteen channels in a compact form factor. All three devices share identical electrical characteristics, interface protocols, and feature sets, differing primarily in the number of accessible I/O ports and corresponding package pin counts.

Replacement Considerations

SX1502EVK is an evaluation kit based on the SX1502I087TRT, not a direct replacement. No other public substitute part numbers are confirmed in the provided documentation.