TCA9554PWR TI I/O Expanders

The TCA9554 is an 8-bit remote I2C low-power I/O expander with interrupt output, configuration registers, and active-low reset. It operates from 1.65V to 5.5V and supports I2C bus speeds up to 400kHz (Fast Mode). The device provides eight general-purpose I/O pins that can be independently configured as inputs or outputs, with built-in pull-up resistors on each I/O. An open-drain interrupt output signals input changes, reducing host polling overhead. The active-low reset initializes registers to default state. Three address pins allow up to eight devices on the same bus (64 total I/Os). Selection is optimal for expanding GPIO capabilities of microcontrollers with limited I/O pins. Applications include portable electronics, server management, industrial controls, telecom equipment, automotive body electronics, and keyboard/button sensing requiring additional I/O lines. In stock at HL Electronics – request a quote for fast delivery.