PCA9511D,112

Signal Buffers, Repeaters, Splitters Overview

The PCA9511D,112 is a hot swappable I2C and SMBus bus buffer manufactured by NXP Semiconductors. It allows I/O card insertion into a live backplane without corrupting data and clock buses. The device features bi-directional buffering for SDA and SCL lines, preventing corruption during live board insertion and removal from multi-point backplane systems. It includes ∆V/∆t rise time accelerators on all SDA and SCL lines with a threshold of 0.6 V. The operating power supply voltage range is 2.7 V to 5.5 V, supporting a clock frequency of 0 to 400 kHz. ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101. Latch-up testing meets JEDEC Standard JESD78 exceeding 100 mA. The package is an 8-pin plastic SO (SOT96-1) with dimensions of 3.9 mm width.

Signal Buffers, Repeaters, Splitters Feature Summary

• Bi-directional buffer for SDA and SCL lines increases fanout and prevents signal corruption during live board insertion and removal from multi-point backplane systems
• Integrated ∆V/∆t rise time accelerator circuitry on all SDA and SCL lines with a 0.6 V threshold to allow weaker DC pull-up currents while meeting rise time requirements
• Digital ENABLE input pin that enables the device when asserted HIGH and forces low current mode when LOW, alongside an open-drain READY output indicating connection status

Signal Buffers, Repeaters, Splitters Applications

• cPCI cards requiring insertion or removal from an operating system
• VME cards requiring insertion or removal from an operating system
• AdvancedTCA cards requiring insertion or removal from an operating system
• Multi-point backplane cards requiring hot swapping capabilities

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the ordering code matches the specific suffix required for the desired package type. Confirm the temperature range aligns with operational requirements. Check for RoHS compliance status if mandated by project specifications. Ensure the manufacturer source is authorized to guarantee product authenticity and traceability.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component for applications requiring hot swappable I2C and SMBus buffering in multi-point backplane systems. The PCA9511D variant specifically includes rise time accelerator circuitry, distinguishing it from the PCA9510 which lacks this feature. Ensure the system pull-up resistors are selected to provide a positive slew rate of at least 1.25 V/µs to activate the boost pull-up currents during rising edges.

Signal Buffers, Repeaters, Splitters Part Context

The PCA9511D belongs to the Philips/NXP PCA951x series of hot swappable I2C and SMBus bus buffers. This family includes variants like the PCA9510, PCA9512, PCA9513, and PCA9514, each offering different feature sets such as hardware disable pins or dual VCC supports. The PCA9511D provides a balance of standard hot swap functionality with integrated rise time acceleration for improved signal integrity.

Signal Buffers, Repeaters, Splitters Replacement Considerations

The PCA9510D is a compatible alternative within the same family but lacks the rise time accelerator circuitry found in the PCA9511D. When substituting, verify that the absence of rise time accelerators does not violate system slew rate requirements. Other family members like PCA9512 or PCA9513 offer additional features such as hardware disable pins or dual VCC supports.