MCP23S08-E/SO

I/o Expanders Overview

The MCP23S08-E/SO is an 8-bit I/O expander featuring a high-speed SPI interface operating up to 10 MHz. It provides eight bidirectional GPIO pins with configurable direction and polarity inversion. The device supports hardware addressing via two address pins (A1, A0), allowing up to four units on a single bus. Key electrical parameters include a supply voltage range of 1.8V to 5.5V, maximum standby current of 1 µA, and output drive capability of 25 mA per pin. It operates within temperature ranges of -40°C to +85°C (Industrial) and -40°C to +125°C (Extended).

I/o Expanders Feature Summary

• Configurable interrupt output supporting active-high, active-low, or open-drain modes.
• Internal weak pull-up resistors for each GPIO pin when configured as inputs.
• Interrupt-on-change functionality comparing pin states against previous values or default registers.
• External reset input for reliable device initialization.

I/o Expanders Applications

• Embedded systems requiring additional general-purpose digital I/O lines.
• Industrial control panels needing isolated input monitoring.
• Consumer electronics utilizing serial bus expansion for peripheral management.

I/o Expanders Procurement Notes

Verify the specific suffix 'SO' corresponds to the 18-pin SOIC package during procurement. Confirm the '-E' grade indicates Extended temperature operation (-40°C to +125°C). Ensure the ordering code matches the required voltage and speed specifications for your application environment.

I/o Expanders Selection Notes

Select this component when SPI connectivity is preferred over I2C due to higher speed requirements up to 10 MHz. Choose the SOIC package for surface-mount assembly compatibility. Consider the MCP23S17 if more than eight I/O lines are necessary, or the MCP23008 if I2C communication is required instead.

I/o Expanders Part Context

This part belongs to the MCP23X08 family of 8-bit I/O expanders from Microchip Technology. It shares functional similarities with the I2C-based MCP23008 but utilizes an SPI interface and fewer address pins. The family is designed for cost-effective parallel I/O expansion in resource-constrained embedded applications.

I/o Expanders Replacement Considerations

The MCP23S08-I/SO serves as the Industrial temperature variant (-40°C to +85°C). For I2C interfaces, the MCP23008 is the functional equivalent. Higher pin count alternatives include the MCP23S17 (16-bit).