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PCA9544 from PHILIPS

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PCA9544

Manufacturer: PHILIPS, PHI

4-channel I2C multiplexer with interrupt logic

Partnumber Manufacturer Quantity Availability
PCA9544 PHILIPS, PHI 249 In Stock

Description and Introduction

4-channel I2C multiplexer with interrupt logic The **PCA9544** from Philips is a versatile **4-channel I²C-bus multiplexer** designed to enable communication between multiple I²C devices sharing the same bus address. This component is particularly useful in systems where multiple I²C slave devices require isolation or selection without bus contention.  

Featuring **bidirectional switching**, the PCA9544 allows a master device to select one of four downstream I²C buses, ensuring seamless data transmission while maintaining signal integrity. Each channel is independently controlled via I²C commands, providing flexibility in system design.  

Key features include **low on-resistance**, **3.3V and 5V compatibility**, and **interrupt functionality** that alerts the master when a downstream device requires attention. The PCA9544 also supports **hot insertion**, making it suitable for dynamic system configurations.  

With its compact footprint and robust performance, the PCA9544 is widely used in applications such as **embedded systems**, **industrial automation**, and **consumer electronics**, where efficient I²C bus management is essential. Its ability to resolve address conflicts and simplify system architecture makes it a reliable choice for designers seeking an effective I²C expansion solution.  

By integrating the PCA9544, engineers can enhance system scalability while maintaining a clean and organized I²C communication structure.

Application Scenarios & Design Considerations

4-channel I2C multiplexer with interrupt logic

Alternative Part Number

  • TCA9544A --: Pin-compatible 4-channel I2C switch with similar functionality and register set, widely available and often used as a direct replacement.
  • PCA9544A --: NXP (formerly Philips) successor device with the same 4-channel I2C multiplexer function and improved specifications.
  • MAX7357 --: 8-channel I2C switch that can serve as a functional alternative when extra channels are acceptable, with similar bus switching capability.
  • PCA9545A --: Similar 4-channel I2C switch with interrupt logic; usable alternative if minor pin/feature differences are acceptable.

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