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PCA8574AN from NXP,NXP Semiconductors

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PCA8574AN

Manufacturer: NXP

Remote 8-bit I/O expander for I2C-bus with interrupt

Partnumber Manufacturer Quantity Availability
PCA8574AN NXP 359 In Stock

Description and Introduction

Remote 8-bit I/O expander for I2C-bus with interrupt The **PCA8574AN** from NXP Semiconductors is a versatile **remote 8-bit I/O expander** designed for **I²C-bus** applications. This low-power CMOS device provides general-purpose input/output expansion, enabling microcontrollers to efficiently manage additional peripherals with minimal pin usage.  

Featuring **quasi-bidirectional I/O ports**, the PCA8574AN simplifies interfacing with sensors, switches, and other digital components. Each port can be individually configured as an input or output, offering flexibility in system design. The built-in **interrupt output** signals the microcontroller when an input state changes, reducing polling overhead and improving efficiency.  

Operating at a **supply voltage range of 2.3V to 5.5V**, the PCA8574AN is suitable for both 3.3V and 5V systems. Its **I²C interface** supports standard (100 kHz) and fast (400 kHz) modes, ensuring compatibility with a wide range of host controllers.  

With **low standby current consumption**, this component is ideal for power-sensitive applications. The PCA8574AN is available in a **DIP-16 package**, making it easy to integrate into prototyping and production environments.  

Engineers value the PCA8574AN for its reliability, ease of use, and ability to expand I/O capabilities without complex circuitry, making it a practical choice for embedded systems, industrial controls, and consumer electronics.

Application Scenarios & Design Considerations

Remote 8-bit I/O expander for I2C-bus with interrupt

Alternative Part Number

  • PCF8574AN --: Same I2C 8-bit I/O expander function with identical pinout and DIP-16 package, widely available and directly drop-in compatible.
  • PCF8574P --: NXP's own I2C 8-bit I/O expander in DIP-16, functionally equivalent to PCA8574AN with the same register map and addressing.
  • MCP23008-E/P --: I2C 8-bit I/O expander in DIP-18 with similar functionality; requires minor pinout adaptation but is a solid alternative when PCA8574 is unavailable.

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