PCA9512DP,118

Signal Buffers, Repeaters, Splitters Overview

The PCA9512DP,118 is a hot swappable I2C and SMBus buffer manufactured by NXP Semiconductors. It provides bi-directional buffering for SDA and SCL lines to prevent signal corruption during live board insertion in 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 while maintaining optimal noise margins. Both pins operate within a supply voltage range of 2.7 V to 5.5 V. It supports clock stretching, multiple master arbitration, and synchronization. The component includes rise time accelerators with hardware disable capability via the ACC pin.

Signal Buffers, Repeaters, Splitters Feature Summary

• Bi-directional buffering isolates backplane and card capacitances to prevent bus corruption during hot swapping
• Dual supply voltage architecture enables level translation between 3.3 V and 5 V systems
• Hardware-controllable rise time accelerators optimize performance for lightly loaded systems
• Control circuitry prevents connection until bus idle or stop conditions are detected

Signal Buffers, Repeaters, Splitters Applications

• CompactPCI (cPCI), VME, and AdvancedTCA cards requiring hot swap capabilities
• Multi-point backplane systems where I/O cards must be inserted or removed from an operating system
• Level translation interfaces between 5 V and 3.3 V I2C/SMBus domains

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the ordering suffix '118' corresponds to the TSSOP8 package variant as specified in the datasheet. Confirm that the component status aligns with current production availability, as legacy Philips/NXP documentation may indicate changes in lifecycle status. Ensure compatibility with the specific temperature range requirements of the target application.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when designing systems requiring hot-swappable I/O cards on I2C or SMBus backplanes. It is suitable for applications needing isolation between backplane and card capacitance. Consider the ACC pin configuration if the system requires disabling rise time accelerators for lightly loaded buses. Verify that pull-up resistor values meet the minimum capacitance requirements for stable operation.

Signal Buffers, Repeaters, Splitters Part Context

The PCA9512 belongs to the PCA951x family of bus buffers designed for I2C and SMBus applications. Unlike static offset drivers, it utilizes a dynamic offset design allowing series or parallel connection with other devices in the same family. It differs from the PCA9510/11 by including dual supply pins for level shifting and an ACC pin for accelerator control.

Signal Buffers, Repeaters, Splitters Replacement Considerations

The PCA9512D is the SOIC-8 equivalent of the PCA9512DP. Other family members like PCA9510A, PCA9511A, PCA9513A, and PCA9514A share similar dynamic offset characteristics but lack specific features such as dual supply level shifting or hardware accelerator disable.