Microchip MCP23008-E/SO 8-Bit I/O Expander 1.7MHz 1.8-5.5V 18-Pin SOIC

Microchip MCP23008-E/SO 8-Bit I/O Expander is an 8-bit input/output expander with a 1.7 MHz I²C serial interface, designed to add parallel I/O lines to I²C bus systems. It is presented in a compact 18-lead SOIC package, making it suitable for space-constrained electronic designs.

Overview

The device provides seamless parallel I/O expansion for I²C bus applications. Its high-speed serial interface supports a maximum bus frequency of 1.7 MHz, enabling fast and efficient communication between the system master and the expander. A supply voltage range of 1.8 V to 5.5 V provides compatibility with low-power microcontrollers as well as standard 5 V systems.

Key Features

• Three hardware address pins, allowing up to eight identical devices to share the same I²C bus
• Configurable interrupt output supporting active-high, active-low, or open-drain operation
• Configurable interrupt source for flexible system event handling
• Low standby current of 1 µA (maximum), suited to battery-powered and energy-sensitive applications
• Operating temperature range from -40 °C to 125 °C
• Multiple 8-bit configuration registers allowing each of the eight I/O pins to be set as an input or an output
• Input polarity inversion register for simplified signal conditioning

Internal Operation

The data state for each pin is stored in corresponding input or output registers. The inversion register allows the logical polarity of the input port to be inverted, which simplifies signal conditioning in system designs.

Specifications

• Bus Interface: I²C serial
• Dimensions: 3.3 (width) x 1.5 (depth) x 4.3 (height)
• Weight: 2.948 gm

Combining high speed, low power consumption, a wide voltage range and an extended temperature range, the Microchip MCP23008-E/SO is a flexible choice for expanding I/O in I²C bus designs.