PCA9512D,112

Signal Buffers, Repeaters, Splitters Overview

The PCA9512D,112 is a hot swappable I2C and SMBus buffer manufactured by NXP USA Inc. It provides bidirectional buffering for SDA and SCL lines to prevent bus corruption during live board insertion into multi-point backplane systems. The device features two dedicated supply voltage pins (VCC and VCC2) supporting level shifting between 3.3 V and 5 V systems with no constraints on which supply is higher. Operating supply voltages range from 2.7 V to 5.5 V. It includes dynamic offset design allowing connection in series or parallel with other PCA9510/11/12/13/14 devices. The component supports clock stretching, multiple master arbitration, and rise time accelerators that can be disabled via the ACC pin.

Signal Buffers, Repeaters, Splitters Feature Summary

• Hot swappable I/O card insertion capability prevents data and clock bus corruption
• Dual supply voltage pins enable level shifting between 3.3 V and 5 V systems
• Dynamic offset design allows connection in series or parallel with compatible buffers
• Hardware disable pin for rise-time accelerators optimizes performance for lightly loaded systems

Signal Buffers, Repeaters, Splitters Applications

• cPCI cards requiring insertion or removal from an operating system
• VME backplane cards needing hot swap functionality
• AdvancedTCA cards requiring live board insertion without bus contention

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific ordering suffix '112' against current manufacturer documentation to confirm package type and temperature range specifications. Confirm availability status as older Philips/NXP products may have limited production runs or end-of-life status. Ensure compatibility with existing PCB footprint requirements for the SOIC-8 package before procurement.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when designing systems requiring hot swapping of I/O cards into active backplanes. Ensure the application involves dual power domains (e.g., 3.3 V and 5 V) to utilize the level shifting feature. Verify that the bus capacitance and pull-up resistor values fall within the recommended ranges specified in the datasheet figures to ensure proper operation of the start-up circuitry and rise-time accelerators.

Signal Buffers, Repeaters, Splitters Part Context

The PCA9512 belongs to the PCA951x family of I2C and SMBus buffers designed for hot swappable applications. Unlike static offset buffers, it utilizes a dynamic offset design suitable for connecting in series or parallel with other devices in the same family. It specifically addresses the need for isolation between backplane and card capacitances during live insertion events.

Signal Buffers, Repeaters, Splitters Replacement Considerations

PCA9512DP is available in TSSOP8 package. PCA9510, PCA9511, PCA9513, and PCA9514 are related family members but differ in features such as idle detection, ready output, and precharge capabilities.