NXP Semiconductors I/O Expanders PCA9554DB112

The PCA9554DB112 is an 8-bit I¬=C-bus and SMBus I/O port expander designed to provide additional GPIO for applications requiring more input/output capabilities. It operates within a power supply voltage range of 2.3V to 5.5V and features 5V tolerant I/O pins. The device supports a clock frequency of up to 400 kHz and includes a polarity inversion register, allowing for flexible configuration of input and output states. This I/O expander includes an open-drain interrupt output that activates when any input state differs from its corresponding Input Port register state, signaling changes to the system master. The PCA9554DB112 is housed in a 16-lead SSOP package, making it suitable for space-constrained designs. It is compatible with the PCF8574 series, although software modifications are necessary due to enhancements in this model. The device is also compliant with AEC-Q100 standards, making it suitable for automotive applications.