The Texas Instruments PCA9555DB is a 16-bit I/O expander featuring I²C and SMBus interfaces. It operates at clock frequencies up to 400 kHz and supports a voltage range of 2.3V to 5.5V.
The Texas Instruments PCA9555DBR is a 16-bit I2C/SMBus I/O expander. It operates at a clock frequency of 400 kHz and supports a voltage range of 2.3V to 5.5V.