MCP23008-E/SO

Overview

The MCP23008-E/SO is an 8-bit I/O expander featuring an I2C interface in an 18-pin SOIC package. It operates within a supply voltage range of 1.8V to 5.5V and supports clock frequencies up to 1.7 MHz. The device provides eight bidirectional GPIO pins with configurable interrupt outputs, internal weak pull-up resistors, and polarity inversion registers. It includes hardware address pins for multi-device bus configurations and maintains low standby current consumption.

Feature Summary

• Supports high-speed I2C communication with configurable clock rates
• Provides eight bidirectional general-purpose I/O ports with interrupt-on-change capability
• Features configurable interrupt output polarity and open-drain modes
• Includes internal weak pull-up resistors and input polarity inversion registers

Applications

• Embedded systems requiring additional digital input/output ports
• I2C bus expansion for microcontrollers with limited GPIO resources
• Industrial control interfaces utilizing interrupt-driven input monitoring

Procurement Notes

Verify the specific suffix 'E/SO' confirms the industrial temperature range and SOIC-18 package. Confirm the datasheet revision matches the required design specifications. Ensure the I2C address configuration aligns with the system's available bus addresses. Check for any recent product change notices affecting pinout or electrical characteristics.

Selection Notes

Select this component when an I2C interface is preferred over SPI for I/O expansion. The three hardware address pins allow up to eight devices on a single bus. Consider the 1.7 MHz maximum clock speed for high-frequency applications. Verify that the 18-pin SOIC package fits the PCB layout constraints compared to PDIP or QFN options.

Part Context

This part belongs to the MCP23X08 family, which also includes the SPI-based MCP23S08. The primary distinction is the serial interface type and the number of hardware address pins. The MCP23008 uses three address pins (A2, A1, A0) for I2C addressing, whereas the MCP23S08 uses two address pins (A1, A0) for SPI chip select logic.

Replacement Considerations

MCP23008T-E/SSVAO: SSOP-20 package variant with similar functionality.