The PCA9557RGYR is an advanced 8-bit I2C and SMBus I/O expander produced by Texas Instruments, a renowned global semiconductor company.

• Package: Compact 16-VQFN (3x3).
• Description: 8-bit CMOS device providing 8 bits of GPIO expansion.
• Feature: Integrated level shifting.
• Standby Current: Low.
• Interrupt Output: Connected to the interrupt logic of the microcontroller.
• Power Supply: 2.3 to 5.5 V.
• Interrupt Output: Open-drain.
• Hardware Address Pins: Three pins allow up to eight devices to share the same bus.