MCP23S09-E/P

I/o Expanders Overview

The MCP23S09-E/P is an 8-bit I/O expander utilizing a serial peripheral interface (SPI). It operates within a voltage range of 1.8 V to 5.5 V and supports clock frequencies up to 10 MHz. The device provides eight bidirectional general-purpose I/O pins with open-drain outputs capable of sinking 25 mA per pin and 200 mA total. It features configurable interrupt outputs, internal pull-up resistors, and hardware reset functionality. The component is housed in an 18-lead PDIP package and functions across temperatures from -40°C to +125°C.

I/o Expanders Feature Summary

• Supports high-speed SPI communication compatible with Mode 0,0 and Mode 1,1 configurations.
• Provides configurable interrupt-on-change capabilities with capture registers for event tracking.
• Features open-drain outputs tolerant to 5.5 V inputs with individually controllable internal pull-ups.

I/o Expanders Applications

• Parallel-to-serial data conversion in embedded systems
• Expansion of microcontroller GPIO ports via SPI bus
• Input sensing applications requiring interrupt-driven notification

I/o Expanders Procurement Notes

Verify the specific suffix 'E/P' corresponds to the PDIP-18 package and industrial temperature grade (-40°C to +125°C) as documented in the datasheet. Confirm that the ordering information matches the manufacturer's current production status and package availability before finalizing procurement plans.

I/o Expanders Selection Notes

Select this component when an SPI interface is required instead of I2C, as indicated by the 'S' in the model number. Ensure the system design accommodates the 18-lead PDIP footprint and that the host controller supports the necessary SPI modes. Verify power supply stability meets the specified operating voltage range during operation.

I/o Expanders Part Context

This part belongs to the MCP23X09 family of 8-bit I/O expanders. The MCP23S09 variant specifically utilizes an SPI interface, distinguishing it from the I2C-based MCP23009. Both share identical register maps and electrical characteristics, differing only in the serial communication protocol used for control and data transfer.

I/o Expanders Replacement Considerations

The MCP23009 serves as a functional equivalent but requires an I2C interface. Direct pin-compatible replacements are limited due to interface differences; verify SPI compatibility or redesign the bus architecture if substituting with non-SPI variants.