MCP23S09T-E/MG

I/o Expanders Overview

The MCP23S09T-E/MG is an 8-bit I/O expander with SPI interface in a 16-lead QFN package. It operates at 1.8V to 5.5V, supports up to 10 MHz clock frequency, and features open-drain outputs with 25 mA sink capability per pin. The device includes configurable interrupt outputs, internal pull-up resistors, and polarity inversion registers for input data.

I/o Expanders Feature Summary

• SPI serial interface supporting Mode 0,0 and Mode 1,1
• Configurable interrupt-on-change or default value comparison
• Open-drain outputs tolerant to 5.5V
• Internal pull-up resistors on all GPIO pins

I/o Expanders Applications

• Remote I/O expansion in embedded systems
• Industrial control panels requiring additional digital inputs/outputs
• Consumer electronics with space-constrained PCB layouts

I/o Expanders Procurement Notes

Verify the exact ordering suffix against Microchip's official documentation to confirm package type and temperature range. Ensure compatibility with system voltage levels and SPI timing requirements before procurement.

I/o Expanders Selection Notes

Select this component when SPI communication is preferred over I2C. Consider the 16-lead QFN package for compact designs. Verify that the 5.5V tolerant inputs meet the host system's logic level requirements.

I/o Expanders Part Context

Part of the MCP23X09 family, which includes I2C (MCP23009) and SPI (MCP23S09) variants. Shares identical register maps and functionality except for the serial interface protocol.

I/o Expanders Replacement Considerations

MCP23S09T-E/SO (SOIC-18), MCP23S09-E/P (PDIP-18). Verify pinout compatibility and thermal performance differences between packages.