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TCA39306

ACTIVE

FM+ I²C bus and SMBus voltage translator

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Data sheet

TCA39306

ACTIVE
Data sheet Order now

Product details

Features Enable pin Protocols I2C, I3C Frequency (max) (MHz) 12.5 VCCA (min) (V) 0.85 VCCA (max) (V) 5.5 VCCB (min) (V) 1.65 VCCB (max) (V) 5.5 Supply restrictions VCCA <= VCCB Rating Catalog Operating temperature range (°C) -40 to 125
Features Enable pin Protocols I2C, I3C Frequency (max) (MHz) 12.5 VCCA (min) (V) 0.85 VCCA (max) (V) 5.5 VCCB (min) (V) 1.65 VCCB (max) (V) 5.5 Supply restrictions VCCA <= VCCB Rating Catalog Operating temperature range (°C) -40 to 125
VSSOP (DCU) 8 6.2 mm² (2 mm × 3.1 mm) SOT-23-THN (DDF) 8 8.12 mm² (2.9 mm × 2.8 mm) X2SON (DTM) 8 1.08 mm² (0.8 mm × 1.35 mm)
  • 2-Bit bidirectional translator for SDA and SCL lines in mixed-mode I 2C applications
  • Standard-mode, fast-mode, and fast-mode plus I 2C and SMBus compatible
  • I 3C compatible (12.5 MHz supported)
  • Allows voltage-level translation between
    • 0.9-V V REF1 and 1.8-V, 2.5-V, 3.3-V, or 5-V V REF2
    • 1.2-V V REF1 and 1.8-V, 2.5-V, 3.3-V, or 5-V V REF2
    • 1.8-V V REF1 and 2.5-V, 3.3-V, or 5-V V REF2
    • 2.5-V V REF1 and 3.3-V or 5-V V REF2
    • 3.3-V V REF1 and 5-V V REF2
  • Provides bidirectional voltage translation with no direction Pin
  • Low ON-state resistance between input and output ports provides less signal distortion
  • Open-drain I 2C I/O ports (SCL1, SDA1, SCL2, and SDA2)
  • 5-V Tolerant I 2C I/O ports to support mixed-mode signal operation
  • High-impedance SCL1, SDA1, SCL2, and SDA2 pins for EN = Low
  • Lockup-free operation for isolation when EN = Low
  • Flow-through pinout for ease of printed-circuit-board trace routing
  • ESD Protection Exceeds JESD 22
    • 2000-V human-body model (A114-A)
    • 1000-V charged-device model (C101)
  • 2-Bit bidirectional translator for SDA and SCL lines in mixed-mode I 2C applications
  • Standard-mode, fast-mode, and fast-mode plus I 2C and SMBus compatible
  • I 3C compatible (12.5 MHz supported)
  • Allows voltage-level translation between
    • 0.9-V V REF1 and 1.8-V, 2.5-V, 3.3-V, or 5-V V REF2
    • 1.2-V V REF1 and 1.8-V, 2.5-V, 3.3-V, or 5-V V REF2
    • 1.8-V V REF1 and 2.5-V, 3.3-V, or 5-V V REF2
    • 2.5-V V REF1 and 3.3-V or 5-V V REF2
    • 3.3-V V REF1 and 5-V V REF2
  • Provides bidirectional voltage translation with no direction Pin
  • Low ON-state resistance between input and output ports provides less signal distortion
  • Open-drain I 2C I/O ports (SCL1, SDA1, SCL2, and SDA2)
  • 5-V Tolerant I 2C I/O ports to support mixed-mode signal operation
  • High-impedance SCL1, SDA1, SCL2, and SDA2 pins for EN = Low
  • Lockup-free operation for isolation when EN = Low
  • Flow-through pinout for ease of printed-circuit-board trace routing
  • ESD Protection Exceeds JESD 22
    • 2000-V human-body model (A114-A)
    • 1000-V charged-device model (C101)

The TCA39306 is a dual bidirectional voltage-level translator compatible with I 2C, SMBus, and I 3C with an enable (EN) input, and is operational from 0.9-V to 3.3-V V REF1 and 1.8-V to 5.5-V V REF2.

The device allows bidirectional voltage translations between 0.85 V and 5 V, without the use of a direction pin. The low ON-state resistance (R ON) of the switch allows connections to be made with minimal propagation delay. When EN is high, the translator switch is ON, and the SCL1 and SDA1 I/O are connected to the SCL2 and SDA2 I/O, respectively, allowing bidirectional data flow between ports. When EN is low, the translator switch is off, and a high-impedance state exists between ports.

In addition to voltage translation, the TCA39306 can be used to isolate a higher speed bus from a lower speed bus by controlling the EN pin to disconnect the slower bus during fast-mode communication.

The TCA39306 is a dual bidirectional voltage-level translator compatible with I 2C, SMBus, and I 3C with an enable (EN) input, and is operational from 0.9-V to 3.3-V V REF1 and 1.8-V to 5.5-V V REF2.

The device allows bidirectional voltage translations between 0.85 V and 5 V, without the use of a direction pin. The low ON-state resistance (R ON) of the switch allows connections to be made with minimal propagation delay. When EN is high, the translator switch is ON, and the SCL1 and SDA1 I/O are connected to the SCL2 and SDA2 I/O, respectively, allowing bidirectional data flow between ports. When EN is low, the translator switch is off, and a high-impedance state exists between ports.

In addition to voltage translation, the TCA39306 can be used to isolate a higher speed bus from a lower speed bus by controlling the EN pin to disconnect the slower bus during fast-mode communication.
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Technical documentation

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* Data sheet TCA39306 Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator datasheet (Rev. B) PDF | HTML Mar 28, 2023
Application note PassFET Hang Time with TCA39306 I2C, I3C Level Translator PDF | HTML Sep 23, 2024
Application note Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) PDF | HTML Jul 3, 2024
Application brief I3C Voltage Translator and Multiplexer Quick Reference PDF | HTML Jan 4, 2024
Application brief Best Practices: I2C Devices on an I3C Shared Bus PDF | HTML Mar 30, 2023
Application brief I3C - Next Generation Serial Communication Interface PDF | HTML Feb 24, 2022

Design & development

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Evaluation board

TCA39306EVM — TCA39306 evaluation module low voltage I²C level-shifter

This EVM provides configurable loading conditions through adjustable pull up resistors and bus capacitance which allows designers to easily test the performance of this device in their system.

User guide: PDF | HTML
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Simulation model

TCA39306 IBIS Model

SCPM048.ZIP (23 KB) - IBIS model
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Design tool

I2C-DESIGNER — I2C designer tool

Use the I2C Designer tool to quickly resolve conflicts in addressing, voltage level and frequency in I2C based designs. Enter master and slave inputs to automatically generate an I2C tree or easily build a custom solution. This tool will help designers save time and comply with the I2C standard (...)
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VSSOP (DCU) 8 Ultra Librarian
SOT-23-THN (DDF) 8 Ultra Librarian
X2SON (DTM) 8 Ultra Librarian
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