SX1512BIULTRT

Overview

The SX1512BIULTRT is a 16-channel I/O expander from Semtech Corporation, packaged in a 28-pin QFN-UT (4x4) format. It supports SPI communication with a clock frequency of up to 20 MHz. The device features low voltage level shifting GPIOs and includes an integrated LED driver. Operating voltage ranges from 1.425V to 3.6V, with an operating temperature range of -40°C to 85°C. Output drive capabilities include 8mA sink and 15mA source currents. The component provides interrupt output functionality and is designed for applications requiring expanded digital inputs and outputs.

Feature Summary

• Integrates 16-level shifting GPIO channels within a compact 28-pin QFN package
• Includes dedicated hardware for LED driving and keypad scanning functions
• Supports high-speed SPI interface operation up to 20 MHz
• Features interrupt output capability for efficient event handling

Applications

• Keyboard controller interfaces
• LED output control systems
• General purpose digital input/output expansion

Procurement Notes

Verify the current lifecycle status before procurement, as distributor records indicate this specific part may be obsolete. Confirm that the 28-QFN-UT package dimensions match your PCB footprint requirements. Ensure the SPI interface timing meets your system's 20 MHz clock specifications. Validate that the 1.425V to 3.6V supply range aligns with your target application's power architecture.

Selection Notes

Select this component when a 16-bit expansion is required with SPI connectivity. Consider the low voltage operation if your system utilizes sub-3.3V logic levels. The integrated LED driver simplifies designs needing direct illumination control without additional transistors. Evaluate the 28-pin QFN size against available board space constraints compared to other I/O expanders.

Part Context

This part belongs to the SX1512 series of I/O expanders by Semtech Corporation. It shares design similarities with the SX1509 series but differs in its primary communication interface, utilizing SPI instead of I2C. The series focuses on providing level-shifting capabilities for GPIO expansion in low-voltage environments.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.