Description
TXS0108E 8-Channel Bidirectional Logic Level Converter
This module is based on the TXS0108E, an 8-bit bidirectional voltage translator with automatic direction sensing. It is intended to interface compatible logic signals between separate voltage domains. It does not translate arbitrary voltages: select the supply rails and signals within the chip and module limits.
Listing details
- Device: TXS0108E
- Channels: 8 bidirectional logic channels
- Module dimensions: approximately 21 × 15 mm
- For a 3.3V-to-5V setup: connect VCCA to 3.3V and VCCB to 5V, as listed
- Connect the grounds of both systems together
- A-side 3.3V logic signals are translated to the B-side voltage, and B-side signals are translated to the A-side voltage when supplies and signals are within specification
- No separate direction-control signal is required for supported use
The listing cautions that this device can be sensitive to some I²C pull-up arrangements. TI documents TXS0108E for open-drain and push-pull applications, including I²C, but circuit topology, external pull-ups, bus capacitance and data rate matter. Follow the device datasheet and verify the module circuit before using it on an I²C bus.
Basic connections
- VCCA: lower-voltage logic supply (for example, 3.3V when translating between 3.3V and 5V)
- VCCB: higher-voltage logic supply (for example, 5V in that setup)
- GND: connect to the common ground of both systems
- A1–A8 / B1–B8: connect corresponding signals on the two voltage domains
- OE: observe the module pinout and datasheet requirements; do not leave enable behavior to assumption
Confirm the exact board pin labels and the voltage limits of every connected device before powering the circuit. Open the datasheet supplied with the source listing.
