TCA39306 Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
1 Features
- 2-Bit bidirectional translator for SDA and SCL lines in mixed-mode I2C applications
- Standard-mode, fast-mode, and fast-mode plus I2C and SMBus compatible
- I3C compatible (12.5 MHz supported)
- Allows voltage-level translation between
- 0.9-V VREF1
and 1.8-V, 2.5-V, 3.3-V,
or 5-V VREF2 - 1.2-V VREF1
and 1.8-V, 2.5-V, 3.3-V,
or 5-V VREF2 - 1.8-V VREF1 and 2.5-V, 3.3-V, or 5-V VREF2
- 2.5-V VREF1 and 3.3-V or 5-V VREF2
- 3.3-V VREF1 and 5-V VREF2
- 0.9-V VREF1
and 1.8-V, 2.5-V, 3.3-V,
- Provides bidirectional voltage translation with no direction Pin
- Low ON-state resistance between input and output ports provides less signal distortion
- Open-drain I2C I/O ports (SCL1, SDA1, SCL2, and SDA2)
- 5-V Tolerant I2C 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 Applications
- I2C, SMBus, PMBus, MDIO, UART, low-speed SDIO, GPIO, and other two-signal interfaces
- Servers
- Routers (telecom switching equipment)
- Personal computers
- Industrial automation
3 Description
The TCA39306 is a dual bidirectional voltage-level translator compatible with I2C, SMBus, and I3C with an enable (EN) input, and is operational from 0.9-V to 3.3-V VREF1 and 1.8-V to 5.5-V VREF2.
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 (RON) 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.
| PART NUMBER | PACKAGE(1) | BODY SIZE (NOM) |
|---|---|---|
| TCA39306 | VSSOP (8) | 2.30 mm x 2.00 mm |
| SOT-23 (8) | 2.90 mm x 1.60 mm | |
| X2SON (8) | 1.35 mm x 0.80 mm |
Simplified Application Diagram4 Revision History
Changes from Revision A (August 2021) to Revision B (March 2023)
- Deleted the "Product Preview" note from the SOT-23 in the Package Information tableGo
- Added DDF (SOT-23) to the Thermal Information tableGo
Changes from Revision * (June 2021) to Revision A (August 2021)
- Changed the document from Advanced Information to Production dataGo
5 Pin Configuration and Functions
Figure 5-1 DDF Package, 8-Pin SOT,
Top View
Figure 5-3 DTM Package, 8-Pin X2SON, Top View
Figure 5-2 DCU Package, 8-Pin VSSOP,
Top View| PIN | I/O | DESCRIPTION | ||
|---|---|---|---|---|
| NAME | NO. | |||
| DCU, DDF | DTM | |||
| EN | 8 | 8 | I | Switch enable input |
| GND | 1 | 1 | — | Ground, 0 V |
| SCL1 | 3 | 3 | I/O | Serial clock, low-voltage side |
| SCL2 | 6 | 6 | I/O | Serial clock, high-voltage side |
| SDA1 | 4 | 4 | I/O | Serial data, low-voltage side |
| SDA2 | 5 | 5 | I/O | Serial data, high-voltage side |
| VREF1 | 2 | 2 | I | Low-voltage-side reference supply voltage for SCL1 and SDA1 |
| VREF2 | 7 | 7 | I | High-voltage-side reference supply voltage for SCL2 and SDA2 |
