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PCA9544A from PHIL,Philips

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PCA9544A

Manufacturer: PHIL, PHILIPS, PHI

4-channel I2C multiplexer with interrupt logic

Partnumber Manufacturer Quantity Availability
PCA9544A PHIL, PHILIPS, PHI 3023 In Stock

Description and Introduction

4-channel I2C multiplexer with interrupt logic The **PCA9544A** from Philips is a versatile **I²C bus multiplexer** designed to enable communication between multiple I²C-compatible devices using a single bus. This component is particularly useful in systems where multiple slave devices share the same I²C address, preventing conflicts and simplifying bus management.  

Featuring **four bidirectional translating switches**, the PCA9544A allows one primary I²C bus to connect to four secondary channels, each capable of supporting standard (100 kHz) and fast-mode (400 kHz) I²C operations. The device includes an **interrupt input** for each channel, enabling efficient handling of slave-initiated communication requests.  

The PCA9544A operates with a **wide voltage range (2.3V to 5.5V)**, making it compatible with various logic levels. Its low standby current consumption ensures energy efficiency in power-sensitive applications. Additionally, the built-in **power-on reset** function guarantees a known state upon startup, enhancing system reliability.  

Common applications include **embedded systems, industrial automation, and consumer electronics**, where multiple I²C peripherals must coexist without address conflicts. By providing seamless channel selection via I²C commands, the PCA9544A simplifies complex bus architectures while maintaining robust performance.  

With its compact packaging and straightforward integration, the PCA9544A remains a practical solution for expanding I²C connectivity in modern electronic designs.

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 map, widely available and often used as a direct substitute.
  • PCA9545A --: Same family 4-channel I2C switch with interrupt logic; closely related feature set and compatible bus interface, suitable when extra features are acceptable.
  • PCA9546A --: 4-channel I2C switch in the same series with similar control interface; usable alternative when interrupt handling is not required.
  • PCA9544APW --: NXP (formerly Philips) continues the PCA9544A family; this is the same functional 4-channel I2C switch from the original manufacturer lineage, ensuring identical behavior.
  • TCA9545A --: TI 4-channel I2C switch with interrupt support, comparable to PCA9544A in function and often used as a cross-vendor replacement.

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