SX1505I087TRT

Overview

The SX1505I087TRT is an 8-channel General Purpose Input/Output (GPIO) expander designed for low-power handheld battery-powered equipment. It facilitates serial I/O expansion via a standard 400kHz I2C interface, allowing microcontrollers to control additional ports when internal resources are insufficient. The device operates with a core voltage as low as 2.5V, while I/O banks support independent voltages between 2.5V and 5.5V, enabling level shifting capabilities. It features programmable pull-up/pull-down resistors, push/pull outputs, and mask-programmable interrupts based on edge detection. The component is housed in a QFN-UT-20 package and supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Supports true bi-directional I/O with programmable pull-up/pull-down configurations and push/pull output modes.
• Provides fully programmable logic functions similar to a PLD to reduce external logic gate requirements.
• Generates active-low interrupt signals on rising or falling edges of GPIO lines with bit-maskable sensitivity.
• Includes Power-On Reset and external reset input functionality for reliable system initialization.

Applications

• Cell phones and PDAs
• Digital cameras
• Portable multimedia players
• Notebooks and GPS units

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to ensure compatibility with required packaging formats. Confirm that the RoHS and WEEE compliance status matches project environmental regulations. Check for any updates regarding the availability of evaluation kits or reference designs associated with this part number.

Selection Notes

Select the SX1505I087TRT when eight independent GPIO channels are required alongside level-shifting capabilities between different voltage domains. Ensure the application benefits from the integrated programmable logic functions to minimize external components. Verify that the I2C bus speed and address configuration align with the host controller's interface specifications.

Part Context

This component belongs to the SX1504/SX1505/SX1506 family of GPIO expanders manufactured by Semtech Corporation. While sharing similar architectural features and interfaces, the SX1505 specifically provides eight I/O channels, distinguishing it from the four-channel SX1504 and the sixteen-channel SX1506. All variants utilize the same ultra-thin QFN packages and operate within the same electrical parameters.

Replacement Considerations

The SX1504I087TRT serves as a compatible alternative if only four GPIO channels are sufficient for the design. Conversely, the SX1506I091TRT offers sixteen channels but requires a larger QFN-UT-28 package. Substitution should account for the difference in pin count and register map complexity.