PCA9511ADP,118

Signal Buffers, Repeaters, Splitters Overview

The PCA9511ADP,118 is a hot swappable I2C-bus and SMBus buffer manufactured by NXP Semiconductors. It allows I/O card insertion into live backplanes without corrupting data or clock buses. The device provides bidirectional buffering for SDA and SCL lines, isolating backplane and card capacitances. It operates within a supply voltage range of 2.7 V to 5.5 V and supports clock frequencies from 0 Hz to 400 kHz. The component includes built-in ΔV/Δt rise time accelerators with a 0.6 V threshold, requiring the bus pull-up voltage to match the supply voltage (VCC).

Signal Buffers, Repeaters, Splitters Feature Summary

• Bidirectional buffering for SDA and SCL lines prevents signal corruption during live board insertion and removal.
• Built-in ΔV/Δt rise time accelerator circuitry on all SDA and SCL lines enhances signal integrity.
• Digital ENABLE input controls device operation, while an open-drain READY output indicates connection status.
• High-impedance SDA and SCL pins are maintained when VCC is 0 V.

Signal Buffers, Repeaters, Splitters Applications

• Insertion and removal of cPCI cards into operating systems.
• Insertion and removal of VME cards into operating systems.
• Insertion and removal of AdvancedTCA cards into operating systems.

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the ordering suffix ',118' corresponds to the TSSOP8 package variant. Confirm the manufacturer is NXP Semiconductors. Ensure the part number matches the specific datasheet revision required for your design. Check for RoHS compliance documentation if necessary.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when hot swapping capabilities are required for I2C or SMBus interfaces. Ensure the system pull-up voltage matches the VCC supply, as the rise time accelerators require identical voltages. Verify that the bus capacitance and pull-up resistor values fall within the recommended ranges to activate the boost currents correctly.

Signal Buffers, Repeaters, Splitters Part Context

The PCA9511A belongs to the PCA95XXA family of hot swappable bus buffers. Unlike the PCA9510A, it features integrated rise time accelerator circuitry. This distinguishes it from other family members that may lack these accelerators or possess different threshold characteristics. It is designed specifically for multipoint backplane systems requiring robust signal buffering.

Signal Buffers, Repeaters, Splitters Replacement Considerations

Texas Instruments offers the TCA9511A as a functionally similar hot swappable I2C bus buffer. Verify pin compatibility and electrical specifications before substitution. Note that the TI version specifies a minimum operating voltage of 2.3 V, differing from the NXP specification.