Chip: MCP23017 Chip grade: industrial grade Number of lOs: 16 (input, output, interrupt) Drivers: 51 and Arduino Drive current: 25mAI2C Frequency: 100KHz, 400KHz, 1.7MHz Working voltage: 3.0V-5.5V Working temperature: - 40 ? - 125 ? Function: IIC interface 16-way input/output expansion Specification and dimension: 65x19mm