PCA9555DWR TI I/O Expanders

The PCA9555DWR is a 16-bit I2C-bus and SMBus I/O expander from Texas Instruments providing general-purpose parallel input/output expansion for the two-line bidirectional I2C bus protocol. It operates over a supply voltage range of 2.3V to 5.5V and supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock frequencies. The device features 16 I/O pins (two 8-bit ports) that can be individually configured as input or output via an I/O direction register, along with polarity inversion registers for input polarity configuration. Key features include an open-drain active-low interrupt output that alerts the master when input port states change, three hardware address pins allowing up to eight devices on the same I2C/SMBus, internal power-on reset, noise filter on SCL/SDA inputs, and latched outputs with high-current drive capability for directly driving LEDs. Each I/O can sink up to 25 mA. Housed in a 24-pin SOIC (DW) package, it operates over -40°C to 85°C. Applications include servers, routers, personal computers, personal electronics, industrial automation, gaming consoles, and products with GPIO-limited processors requiring 16-bit I/O expansion. In stock at HL Electronics – request a quote for fast delivery.