Texas Instruments PCA9557 Remote 8-Bit I2C and SMBus Low-Power I/O Expander with Reset and Configuration Registers PCA9557DG4

The PCA9557 is an 8-bit I2C and SMBus low-power I/O expander designed for operation within a voltage range of 2.3V to 5.5V. It features a low standby current consumption of 1OºA maximum and supports a 400kHz fast I2C bus. The device includes three hardware address pins, allowing for the connection of up to eight PCA9557 devices on the same I2C/SMBus. This expander provides input and output configuration registers, a polarity inversion register, and an active-low reset input. It is capable of driving high-current outputs, suitable for directly powering LEDs. The PCA9557 also incorporates internal power-on reset functionality, ensuring that all channels are configured as inputs upon power-up, with no glitches during initialization. The device is suitable for various applications, including telecom shelters, servers, routers, personal computers, and industrial automation, making it a versatile choice for projects requiring GPIO expansion. ESD protection ratings exceed industry standards, ensuring reliability in various environments.