MCP23S09-E/SO

I/o Expanders Overview

The MCP23S09-E/SO is an 8-bit I/O expander featuring a high-speed SPI interface. It operates within a supply voltage range of 1.8 V to 5.5 V and supports clock frequencies up to 10 MHz. The device provides eight bidirectional GPIO pins with open-drain outputs capable of sinking 25 mA per pin and 200 mA total. Inputs are tolerant up to 5.5 V. It includes configurable interrupt outputs, internal pull-up resistors, and hardware reset functionality. The component is housed in an 18-lead SOIC package and functions across temperatures from -40°C to +125°C.

I/o Expanders Feature Summary

• High-speed serial communication via SPI protocol supporting Mode 0,0 and Mode 1,1
• Configurable interrupt output with active-high, active-low, or open-drain settings
• Interrupt-on-change capability comparing against previous values or default registers
• Bidirectional I/O ports with individually configurable internal pull-up resistors

I/o Expanders Applications

• General-purpose parallel I/O expansion for microcontroller systems
• Embedded control interfaces requiring additional input/output channels
• Industrial automation devices needing remote I/O capabilities

I/o Expanders Procurement Notes

Verify the specific ordering suffix matches the required package type and temperature grade. Confirm that the SPI interface requirements align with the host controller's capabilities. Ensure the design accommodates the 18-lead SOIC footprint dimensions. Check for any recent product change notifications regarding manufacturing updates.

I/o Expanders Selection Notes

Select this model when an SPI interface is preferred over I2C to avoid address conflicts. Consider the 5.5 V tolerant inputs if interfacing with higher voltage logic levels. Evaluate the need for open-drain outputs versus push-pull configurations for the interrupt line. Verify power consumption requirements against the standby current specifications.

I/o Expanders Part Context

This component belongs to the MCP23X09 family of I/O expanders. It shares functional similarities with the MCP23009 but utilizes an SPI interface instead of I2C. Other variants include different package options such as PDIP, QFN, and SSOP. The family provides a standardized register set for easy migration between interface types.

I/o Expanders Replacement Considerations

MCP23S09T-E/SO is a verified tape-and-reel variant of the same electrical specification.