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PCA9517 from NXP,NXP Semiconductors

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PCA9517

Manufacturer: NXP

Level translating I2C-bus repeater

Partnumber Manufacturer Quantity Availability
PCA9517 NXP 436 In Stock

Description and Introduction

Level translating I2C-bus repeater The **PCA9517** from NXP Semiconductors is a versatile **I²C bus repeater** designed to extend the range and reliability of I²C communication systems. It serves as a bidirectional buffer, allowing multiple I²C segments to operate at different voltage levels while maintaining signal integrity.  

This component is particularly useful in applications where long bus lengths, capacitive loading, or mixed-voltage I²C networks could degrade signal quality. The PCA9517 prevents bus lock-up by isolating capacitance between segments, ensuring stable communication. It supports standard-mode (100 kHz) and fast-mode (400 kHz) I²C operations, making it compatible with a wide range of devices.  

Key features include **hot-swappable capability**, which minimizes disruptions during live insertion, and **automatic direction sensing**, eliminating the need for additional control signals. The device also incorporates **rise time accelerators** to improve signal edges in high-capacitance environments.  

Ideal for industrial control, telecommunications, and embedded systems, the PCA9517 enhances system flexibility while maintaining compliance with I²C protocol standards. Its robust design ensures reliable performance in demanding applications, making it a preferred choice for engineers seeking efficient I²C bus expansion solutions.

Application Scenarios & Design Considerations

Level translating I2C-bus repeater

Alternative Part Number

  • TCA9517ADGKR --: Pin-compatible I2C bus repeater with similar level-translating function and widely available as a direct second source.
  • LTC4311IMS8 --: I2C bus accelerator/expander that improves bus capacitance handling and can replace the PCA9517 in many buffering applications.
  • PI4ULS5V202Q --: Low-voltage bidirectional level translator suitable for I2C bus translation, offering a cost-effective alternative with similar functionality.

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