PI6ULS5V9517AUE

Signal Buffers, Repeaters, Splitters Overview

The PI6ULS5V9517AUEX is a CMOS integrated circuit designed as a level translating I2C bus and SMBus repeater. It provides bidirectional buffering for serial data (SDA) and clock (SCL) lines, enabling voltage translation between Port A operating from 0.8 V to 5.5 V and Port B operating from 2.2 V to 5.5 V. The device supports Standard-mode and Fast-mode I2C devices with a maximum clock frequency of 400 kHz. It features an active HIGH enable input, open-drain outputs, and powered-off high-impedance pins. The component is available in MSOP-8, TDFN2x3-8, and SOIC-8 packages.

Signal Buffers, Repeaters, Splitters Feature Summary

• Provides bidirectional buffering for both SDA and SCL lines to extend I2C bus length and capacitance limits.
• Performs voltage level translation between low voltage domains (down to 0.8 V) and higher voltage domains (2.2 V to 5.5 V).
• Supports arbitration and clock stretching across the repeater while maintaining lock-up free operation.
• Features an active HIGH enable input to isolate buses during power-up or idle states.

Signal Buffers, Repeaters, Splitters Applications

• Extending I2C bus systems by isolating two halves of a bus for voltage and capacitance.
• Connecting mixed-mode applications requiring level shifting between 0.8 V and 5.5 V logic levels.
• Allowing multiple masters and Standard-mode or Fast-mode I2C devices to communicate across different voltage domains.

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific package suffix against the ordering information table to ensure correct physical dimensions and pinout compatibility. Confirm RoHS compliance status and lead-free requirements if applicable to the target assembly process. Check for automotive qualification requirements such as AEC-Q100 if the application demands specific change control standards.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when system design requires extending I2C bus capacitance beyond standard limits or bridging distinct voltage domains. Ensure Port A supply voltage meets the minimum 0.8 V requirement for low-voltage side connections. Verify that Port B operates within the 2.2 V to 5.5 V range. Consider propagation delays when connecting multiple units in series due to time-of-flight limitations at maximum bus speeds.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the PI6ULS5V9517A series of signal buffers and repeaters manufactured by Diodes Incorporated. It is specifically engineered for I2C and SMBus interface applications where voltage translation and bus isolation are necessary. The device replaces older buffer solutions by offering integrated level shifting capabilities without performance degradation during translation.

Signal Buffers, Repeaters, Splitters Replacement Considerations

Direct substitutes include other parts within the PI6ULS5V9517A family such as the PI6ULS5V9509UEX, which shares similar level translating functionality but may differ in specific electrical characteristics or package availability. Verify pin compatibility and voltage ranges before substitution.

Signal Buffers, Repeaters, Splitters FAQ

Can multiple PI6ULS5V9517A devices be connected in series?

Yes, multiple devices can be connected in series provided that Port A of one unit is connected to Port B of the next. This configuration allows for extended bus lengths, though the number of units is limited by propagation delay and maximum bus speed requirements.

What is the function of the EN pin during I2C operations?

The EN pin is an active HIGH enable input used to turn the drivers on or off. It should only change state when the global bus and the repeater port are in an idle state to prevent hanging the bus or confusing I2C parts during active transmission cycles.

How does the device handle lock-up conditions?

The device ensures lock-up free operation through its internal design. Specifically, the B-side output low level is approximately 0.5 V, which prevents the input from recognizing it as a valid low if released, thereby avoiding lock-up scenarios common in similar devices.