PI6ULS5V9509WEX

Signal Buffers, Repeaters, Splitters Overview

The PI6ULS5V9509 is a level translating I2C-bus/SMBus repeater designed for mixed-mode applications. 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 current sensing mechanism with a 1mA pull-up and 200Ω pull-down driver to prevent bus lock-up. Port B features open-drain inputs/outputs compliant with SMBus levels. The repeater supports arbitration and clock stretching across the bus. It operates at frequencies from 0Hz to 400kHz and includes an active HIGH enable pin. ESD protection exceeds 8kV HBM.

Signal Buffers, Repeaters, Splitters Feature Summary

• Bidirectional buffering isolates capacitance and enables connection of two buses with up to 400pF each.
• Integrated current sensing on Port A prevents bus lock-up conditions during operation.
• Supports arbitration and clock stretching events across the repeater interface.
• Powered-off high-impedance state ensures safe isolation when supplies are removed.

Signal Buffers, Repeaters, Splitters Applications

• Extending I2C bus trace lengths in mixed-voltage system designs.
• Connecting low-voltage masters to higher-voltage slave devices.
• Isolating bus capacitance to accommodate additional I2C devices.

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific ordering suffix against official Diodes Incorporated documentation to confirm package type and reel specifications. Ensure that the selected variant matches the required tape and reel configuration for automated assembly processes. Cross-reference the document revision number to guarantee access to the most current electrical characteristics and mechanical drawings before finalizing procurement orders.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when bidirectional level translation between 1.1V and 5.5V domains is required for I2C or SMBus protocols. Verify that the application involves mixed-mode environments where voltage isolation and capacitance buffering are necessary. Confirm that the operating frequency requirements do not exceed the specified 400kHz limit, accounting for propagation delays introduced by the repeater circuitry.

Signal Buffers, Repeaters, Splitters Part Context

This device belongs to the PI6ULS5V series of interface signal buffers and repeaters manufactured by Diodes Incorporated. It is specifically engineered for I2C and SMBus protocol extensions. The component falls under the Interface ICs subcategory and utilizes an 8-pin MSOP surface-mount package for compact integration into electronic systems requiring robust bus management capabilities.

Signal Buffers, Repeaters, Splitters Replacement Considerations

Consult official manufacturer substitution guides for verified alternatives. Generic replacements may lack the specific current-sensing lock-up prevention mechanism or exact voltage translation ranges defined in the datasheet. Validate any substitute part against the original electrical parameters and pinout compatibility before implementation.

Signal Buffers, Repeaters, Splitters FAQ

How does the PI6ULS5V9509 prevent bus lock-up?

Port A utilizes a current sensing mechanism with a 1mA current source for pull-up and a 200Ω pull-down driver. This setup creates a LOW output voltage approximately 0.2V, while the input threshold is set about 50mV lower, ensuring internal LOW states are not recognized as external LOW signals.

What are the supply voltage ranges for Port A and Port B?

Port A operates within a range of 1.1V to VCC(B)-1.0V. Port B operates within a range of 2.5V to 5.5V. Drivers are disabled unless VCC(A) is above 0.8V and VCC(B) is above 2.5V.

Can the device support multiple masters on the bus?

Yes, the PI6ULS5V9509 accommodates Standard-mode and Fast-mode I2C-bus devices and supports multiple masters. It also permits arbitration and clock stretching events across the repeater.