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PCA8574PW from NXP,NXP Semiconductors

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PCA8574PW

Manufacturer: NXP

Remote 8-bit I/O expander for I虏C-bus with interrupt

Partnumber Manufacturer Quantity Availability
PCA8574PW NXP 61 In Stock

Description and Introduction

Remote 8-bit I/O expander for I虏C-bus with interrupt The **PCA8574PW** from NXP Semiconductors is a versatile **I²C-bus controlled 8-bit I/O expander**, designed to simplify interfacing between microcontrollers and peripheral devices. This CMOS-based component provides general-purpose remote I/O expansion via the two-wire bidirectional I²C bus, making it ideal for applications requiring additional input/output ports without increasing microcontroller pin count.  

Featuring **low current consumption**, the PCA8574PW operates across a **2.3V to 5.5V supply range**, ensuring compatibility with various logic levels. Its **quasi-bidirectional I/O ports** eliminate the need for external pull-up resistors, reducing system complexity. Each I/O pin can be independently configured as an input or output, offering flexibility in design.  

With an **interrupt output** pin, the device efficiently alerts the host microcontroller to input state changes, minimizing continuous polling. The **400 kHz I²C interface** ensures fast communication, while three hardware address pins allow up to **eight devices** on the same bus, enabling scalable solutions.  

Common applications include **keypad scanning, LED control, sensor interfacing, and industrial automation**. Its compact **TSSOP16 package** makes it suitable for space-constrained designs. The PCA8574PW combines ease of integration with robust performance, making it a reliable choice for expanding digital I/O capabilities in embedded systems.

Application Scenarios & Design Considerations

Remote 8-bit I/O expander for I虏C-bus with interrupt

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