PCA9522D,118

Signal Buffers, Repeaters, Splitters Overview

The PCA9522D,118 is a monolithic bipolar integrated circuit designed as a fast dual bidirectional bus buffer with hot insertion logic. It supports I2C-bus (Standard and Fast modes), SMBus, and PMBus protocols. The device extends bus load limits by buffering SCL and SDA lines and enables level translation between bus voltages ranging from 1.8 V to 10 V. It operates on a supply voltage of 2.7 V to 5.5 V and features an enable pin for isolating bus segments. The component includes precharge circuitry to minimize data corruption during live backplane insertion and provides an open-collector ready output.

Signal Buffers, Repeaters, Splitters Feature Summary

• Dual bidirectional unity gain isolating buffer supporting I2C, SMBus, and PMBus
• Hot insertion logic with precharge functionality prevents data corruption on live backplanes
• Level shifting capability between 1.8 V and 10 V bus voltages
• Enable function allows isolation of bus sections to prevent command truncation

Signal Buffers, Repeaters, Splitters Applications

• Backplane management and interconnect systems
• Telecommunications equipment including AdvancedTCA architectures
• Desktop and portable computers utilizing RAID controllers

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the ordering suffix '118' against the manufacturer's current documentation to confirm specific packaging details such as reel size or tape dimensions. Ensure the selected package variant matches the required PCB footprint, specifically the SO8 plastic small outline package defined in the datasheet. Confirm that the supply voltage requirements align with the 2.7 V to 5.5 V operating range specified for the device.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when system design requires buffering I2C or SMBus signals across different voltage domains up to 10 V. It is suitable for applications needing hot insertion capabilities without causing bus glitches. Consider the 6 mA static pull-down capability and low noise susceptibility for high-reliability environments. Ensure the total system capacitance does not exceed specifications requiring additional damping resistors.

Signal Buffers, Repeaters, Splitters Part Context

The PCA9522 serves as a drop-in replacement for the IES5502, though it reduces the maximum bus voltage limit from 15 V to 10 V. It is part of NXP's portfolio of bus interface solutions designed for robust communication in complex multi-voltage systems. The device integrates unique control logic to manage signal directionality and timing without external rise-time accelerators.

Signal Buffers, Repeaters, Splitters Replacement Considerations

The PCA9522 is explicitly documented as a drop-in replacement for the IES5502. Designers must account for the reduction in maximum bus voltage tolerance from 15 V to 10 V when substituting these parts.