PI6ULS5V9509UEX

Signal Buffers, Repeaters, Splitters Overview

The PI6ULS5V9509UEX is a level translating I2C-bus/SMBus repeater manufactured by Diodes Incorporated. It provides bidirectional level translation between low voltage (1.1V to VCC(B)-1.0V) and higher voltage (2.5V to 5.5V). The device isolates two halves of a bus for both voltage and capacitance, accommodating up to 400pF on port B. Port A uses a 1mA current source pull-up and a 200Ω pull-down driver, while Port B features open-drain inputs/outputs compliant with SMBus levels. It supports clock frequencies from 0Hz to 400kHz and includes an active HIGH enable pin.

Signal Buffers, Repeaters, Splitters Feature Summary

• Bidirectional buffering isolates bus capacitance and enables voltage translation between mixed-mode systems.
• Port A utilizes internal current sensing mechanisms to prevent bus lock-up conditions during operation.
• Supports arbitration and clock stretching across the repeater without performance degradation.

Signal Buffers, Repeaters, Splitters Applications

• Extending I2C or SMBus systems with longer trace lengths.
• Connecting multiple masters and slave devices across different voltage domains.
• Isolating bus segments to accommodate increased device capacitance limits.

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify component authenticity through authorized Diodes Incorporated channels. Confirm RoHS compliance and lead-free status against current manufacturing standards. Ensure supply chain integrity by sourcing only from verified distributors to avoid counterfeit components.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when bidirectional level shifting between 1.1V and 5.5V domains is required. Ensure system voltage requirements align with Port A and Port B specifications. Verify that the application benefits from internal pull-up mechanisms on the lower voltage side.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the PI6ULS5V9509 series of interface signal buffers and repeaters. It is designed for mixed-mode applications requiring robust I2C and SMBus connectivity. The MSOP-8 package allows for compact integration in space-constrained electronic designs.

Signal Buffers, Repeaters, Splitters Replacement Considerations

Consult official Diodes Incorporated documentation for confirmed substitute part numbers. Verify electrical compatibility and pin configuration before implementing any alternative components in existing designs.

Signal Buffers, Repeaters, Splitters FAQ

How does the device prevent bus lock-up?

Port A employs a current sensing mechanism where the input threshold is set approximately 50mV lower than the output LOW voltage, preventing internal feedback loops that cause lock-ups.

What are the operating voltage ranges for the ports?

Port A operates between 1.1V and VCC(B)-1.0V, while Port B operates between 2.5V and 5.5V.

Does the device require external resistors?

No external pull-up resistors are required on the lower voltage Port A due to its internal 1mA current source pull-up.