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PCA9545APW from PHILIPS

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PCA9545APW

Manufacturer: PHILIPS

4-channel I虏C-bus switch with interrupt logic and reset

Partnumber Manufacturer Quantity Availability
PCA9545APW PHILIPS 1567 In Stock

Description and Introduction

4-channel I虏C-bus switch with interrupt logic and reset The **PCA9545APW** from Philips is a versatile **I²C-bus multiplexer** designed to enable communication between multiple I²C buses using a single master device. This component is particularly useful in systems where multiple I²C slave devices share the same address or when isolation between different I²C segments is required.  

Featuring **four bidirectional translating switches**, the PCA9545APW allows the selection of one of four downstream I²C buses, controlled via the master I²C interface. Each channel operates independently, supporting standard-mode (100 kHz) and fast-mode (400 kHz) I²C protocols. The device includes interrupt logic to notify the master when a downstream slave requires attention, improving system efficiency.  

Housed in a **TSSOP-20 package**, the PCA9545APW is compact and suitable for space-constrained applications. Its low standby current consumption makes it ideal for power-sensitive designs. Additionally, the device incorporates **power-on reset functionality**, ensuring a defined state upon startup.  

Common applications include **embedded systems, industrial controls, and consumer electronics**, where multiple I²C peripherals must coexist without address conflicts. The PCA9545APW simplifies system design by reducing wiring complexity while maintaining reliable I²C communication across multiple buses.  

With robust performance and ease of integration, this multiplexer is a practical solution for expanding I²C connectivity in modern electronic systems.

Application Scenarios & Design Considerations

4-channel I虏C-bus switch with interrupt logic and reset

Alternative Part Number

  • TCA9545APWR --: Pin-compatible 4-channel I2C switch with same address scheme and voltage range, widely available and directly drop-in replaceable.
  • PCA9545AD --: Same PCA9545A function from the original Philips/NXP lineage in SOIC package, electrically equivalent with different package option.
  • PCA9546APW --: Similar 4-channel I2C switch in TSSOP package with compatible control logic, usable as functional substitute with minor firmware consideration.

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