PI6ULS5V9511BUEX

Signal Buffers, Repeaters, Splitters Overview

The PI6ULS5V9511BUEX is a hot-swappable I2C bus and SMBus buffer manufactured by Diodes Incorporated. It supports bidirectional buffering for SDA and SCL lines, increasing fan-out while preventing signal corruption during live board insertion or removal from a backplane. The device operates within a supply voltage range of 2.7V to 5.5V and supports clock frequencies up to 400kHz. Key electrical parameters include a typical propagation delay of 70ns, an input current of 2.8mA at 5.5V, and high-impedance pins when VCC is 0V. It features built-in rise-time accelerators and pre-charges SDA/SCL lines to 1.1V to minimize charging currents.

Signal Buffers, Repeaters, Splitters Feature Summary

• Prevents data and clock bus corruption during the insertion and removal of I/O cards into a live backplane.
• Isolates input SDA and SCL lines from output lines to maintain separation between backplane and card capacitances.
• Incorporates digital ENABLE input and open-drain READY output to manage connection states and low-current modes.
• Provides built-in rise-time accelerators on all SDA and SCL lines to support weaker DC pullup currents.

Signal Buffers, Repeaters, Splitters Applications

• Hot-swapping I/O cards into a live backplane in aPCI, VME, and Advanced TCA systems.
• I2C bus repeater or bus extender applications requiring signal isolation.
• Systems with disparate VCC voltages where level translation and buffering are required.

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific ordering suffix 'UEX' corresponds to the MSOP-8 package and tape/reel packaging configuration as defined in the manufacturer's ordering information. Confirm that the component meets RoHS 3 compliance and halogen-free requirements if mandated by project specifications. Ensure the procurement channel is authorized to guarantee product authenticity and traceability.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when designing systems that require hot-swappable capabilities for I2C or SMBus interfaces. Ensure the system pullup resistors are calculated to provide a positive slew rate of at least 1.25V/µs to activate the rise-time accelerators. Verify that the maximum number of buffers in series does not exceed recommended limits to prevent offset voltage accumulation and false clock edge detection.

Signal Buffers, Repeaters, Splitters Part Context

The PI6ULS5V9511B belongs to the PI6ULS5V9511A family of interface ICs designed for signal buffering and repeating. It is specifically engineered to handle the electrical challenges associated with connecting peripheral cards to active backplanes without disrupting ongoing communication protocols.

Signal Buffers, Repeaters, Splitters Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult the manufacturer directly for alternative components or updated product line information.

Signal Buffers, Repeaters, Splitters FAQ

How does the device protect against bus contention during card insertion?

Control circuitry prevents the backplane from connecting to the card until a stop command or bus idle occurs on the backplane, ensuring no bus contention exists on the card side before connection.

What is the function of the READY pin?

The READY pin is an open-drain output that indicates the connection status. It goes LOW when the SDA/SCL channels are disconnected or ENABLE is LOW, and goes HIGH when the two sides are connected and startup is complete.

Why are SDA and SCL lines pre-charged to 1.1V?

The pre-charge circuitry pulls up the SDA and SCL pins to approximately 1.1V during initialization to minimize the worst-case disturbances and current required to charge the parasitic capacitance of the chip during insertion.