The PCA9534PW from Texas Instruments is a high-performing, low-voltage 8-bit I/O expander that is designed to provide a general-purpose remote I/O expansion for most microcontroller families via the I2C and SMBus interfaces.

• GPIO Expansion: 8-bit configuration, ideal for applications requiring additional GPIOs
• Operating Voltage: 2.3V to 5.5V
• Interrupt Output: Can be connected to the interrupt logic of the microcontroller
• Package: TSSOP package, a surface-mount device
• Standby Current: Low standby current, beneficial for battery-powered devices
• Software Reset: Initializes the device without disconnecting the power supply
• Hardware Address Pins: Three hardware address pins that allow up to eight devices to share the same I2C bus or SMBus