MCP23008T-E/SS

Overview

The MCP23008T-E/SS is an 8-bit I/O expander featuring an I2C serial interface, manufactured by Microchip Technology. 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 general-purpose I/O pins that default to input state. It includes configurable interrupt outputs with open-drain or push-pull options, hardware address pins for multi-device bus support, and internal weak pull-up resistors. The component is housed in a 20-pin SSOP package and functions across industrial temperature ranges.

Feature Summary

• Provides 8-bit remote bidirectional I/O expansion via high-speed I2C interface
• Features configurable interrupt output pin supporting active-high, active-low, or open-drain modes
• Includes polarity inversion register for input port data configuration
• Supports external reset input and low standby current operation

Applications

• General purpose parallel I/O expansion for microcontroller systems
• Embedded control applications requiring additional GPIO ports
• Industrial automation interfaces utilizing I2C communication

Procurement Notes

Verify the specific suffix 'E' indicates the extended temperature grade (-40°C to +125°C) and 'SS' denotes the 20-pin SSOP package. Confirm the 'T' suffix corresponds to tape and reel packaging requirements. Ensure compatibility with the host system's I2C voltage levels and clock speed specifications before integration.

Selection Notes

Select this component when an 8-bit I/O expansion solution is required over the 16-bit MCP23017. Choose the SSOP package for surface mount applications where space constraints favor a smaller footprint compared to SOIC or PDIP variants. Verify that the I2C interface meets the system's bandwidth needs, as SPI alternatives like the MCP23S08 offer higher speeds but require different pin configurations.

Part Context

This part belongs to the MCP23X08 family of 8-bit I/O expanders from Microchip Technology. It shares functional similarities with the SPI-based MCP23S08 but utilizes the I2C protocol for communication. The device is designed to complement microcontrollers by providing additional digital input and output capabilities through a standard two-wire serial bus.

Replacement Considerations

Direct functional substitutes include the MCP23008 without the 'T' (cut tape) or '/SS' (different package) suffixes. For SPI interface requirements, the MCP23S08 series serves as an alternative. Higher pin count expansions may utilize the MCP23017 or MCP23S17 devices.