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Level Translating I2C Bus/SMBus Repeater

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The PI6ULS5V9517B is a CMOS integrated circuit intended for I2C-bus or SMBus applications. It can provide level shifting between low voltage (down to 0.8 V) and higher voltage (2.2 V to 5.5 V) in mixed-mode applications. And it enables I2C and similar bus system to be extended, without degradation of performance even during level shifting.

The PI6ULS5V9517B enables the system designer to isolate two halves of a bus for both voltage and capacitance, accommodating more I2C devices or longer trace length. It also permits extension of the I2C-bus by providing bidirectional buffering for both the data (SDA) and the clock (SCL) lines, thus allowing two buses of 400pF to be connected in an I2C application.


  • 2 channel, bidirectional buffer 
  • I2C-bus and SMBus compatible
  • Port A operating voltage range: 0.8V to 5.5V
  • Port B operating voltage range: 2.2V to 5.5V
  • Voltage level translation from 0.8V to 5.5V and from 2.2V to 5.5V
  • Active HIGH repeater enable input
  • Open-drain input/outputs
  • Lock-up free operation
  • Supports arbitration and clock stretching across the repeater
  • Accommodates Standard-mode and Fast-mode I2C-bus devices and multiple masters
  • Powered-off high-impedance I2C-bus pins
  • 5.5V tolerant I2C-bus and enable pins
  • 0Hz to 400kHz clock frequency (the maximum system operating frequency may be less than 400kHz because of the delays added by the repeater)
  • ESD protection exceeds 8000V HBM per JESD22-A114
  • Packages offered: MSOP-8L, TDFN-8 2*3-8L


  • PC
  • Server
  • Networking
  • Docking

Product Specifications

Product Parameters

Translation From (V) 0.8 to 5.5
Translation To (V) 2.2 to 5.5
Max Signal Rate 400Khz
Bits Needed 2
Auto Direction Sensing? Yes
Shift Bi-Directional
Prop Delay 169ns
Ambient or Junction Temperature (°C) -40 to 85
Compliance (Only Automotive supports PPAP) Standard

Technical Documents

Design tool model software

Recommended Soldering Techniques


Additional Technical Documents are available upon request:
Application information, Evaluation board, and Other technical documents

Request Documents
Orderable Part Number Status Package Environmental Compliance Packing Buy from Distributor /
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Request Samples
Qty. Carrier
PI6ULS5V9517BUEX Active MSOP-8 GREEN 2500 T&R Contact Sales Request Sample
PI6ULS5V9517BZEEX Not Recommended for New Design (NRND) W-DFN2030-8 GREEN 3000 T&R Contact Sales

Environmental Compliance Legend:
LFF: Pb-Free Finish and RoHS 5/6
TLFP: Totally Pb-Free Product and RoHS 6/6
LFGP: Pb-free Finish and Green Product, RoHS 5/6 and Halogen Free
TPGP: Totally Pb-Free and Green Product, RoHS 6/6 and Halogen Free
GREEN: Halogen-free and RoHS compliant
RoHS: RoHS compliant but NOT halogen-free


Product Change Notices

PCN # Issue Date Implementation Date Subject
PCN-2505 2021-01-26 2021-07-26 Device End of Life (EOL)