TXS0108E 8 Channel Bi-Directional Logic Level Converter Module

TXS0108E 8 Channel Bi-Directional Logic Level Converter Module provides a seamless bridge between different voltage domains in high-speed digital systems. This versatile module utilizes the TXS0108E IC from Texas Instruments to facilitate safe communication between devices operating at disparate logic levels, such as 3.3V microcontrollers and 5V sensors. Consequently, it eliminates the risk of overvoltage damage while maintaining signal integrity across eight independent channels. The auto-direction sensing capability removes the need for a direction-control signal, which simplifies circuit design significantly. Furthermore, the module supports both open-drain and push-pull applications. Therefore, you can easily integrate this converter into complex SPI, I2C, or asynchronous UART setups to ensure reliable data transmission throughout your project.

Key Features:

• Auto-Direction Sensing: The internal architecture detects the data flow direction automatically, requiring no external control pins for switching between transmit and receive modes.
• High-Speed Operation: It supports data rates up to 110 Mbps (push-pull) and 1.2 Mbps (open-drain), ensuring compatibility with high-speed serial protocols.
• Partial Power-Down Support: The device features V_CC isolation, which ensures that all outputs are in a high-impedance state if either V_CC input is at ground.
• Eight Independent Channels: Each module handles up to eight separate logic lines, making it perfect for 8-bit data buses or multiple peripheral connections.
• Wide Voltage Range: It translates logic levels across a broad spectrum, specifically bridging the gap between 1.2 V and 5.5 V domains.

Technical Specifications:

• Low-Side Voltage (V_CCA): 1.2 V to 3.6 V
• High-Side Voltage (V_CCB): 1.65 V to 5.5 V (Note: V_CCA must be ≤ V_CCB)
• Maximum Data Rate (Push-Pull): 110 Mbps
• Maximum Data Rate (Open-Drain): 1.2 Mbps
• Propagation Delay: ≈ 3.5 ns (at 3.3V to 5V translation)
• Operating Temperature Range: −40°C to +85°C

Mechanical Specifications:

• IC Base: Texas Instruments TXS0108E
• Mounting: Dual-row breadboard-friendly pin headers
• PCB Material: High-quality FR4 with immersion gold finish
• Header Pitch: Standard 2.54 mm (0.1 inch)

Dimensions:

• Length: ≈ 26.5 mm
• Width: ≈ 15.5 mm
• Height: ≈ 3.0 mm (excluding headers)
• Weight: ≈ 3.5 g

Pinout and Wiring:

• VCCA: Connect to the lower voltage source (e.g., 1.8V or 3.3V).
• VCCB: Connect to the higher voltage source (e.g., 5.0V).
• GND: Connect to the common system ground.
• OE (Output Enable): Tie to V_CCA for normal operation; pull low to place all I/O pins in a high-impedance state.
• A1-A8: Low-voltage side input/output pins.
• B1-B8: High-voltage side input/output pins corresponding to the A-side.
• Wiring Note: However, always ensure V_CCA never exceeds V_CCB to prevent internal latch-up or damage.

Datasheet Reference:

• Download Texas Instruments TXS0108E Datasheet

Commonly Used in:

• Inter-Integrated Circuit (I2C) Communication: Level-shifting the SDA and SCL lines between 3.3V microcontrollers and 5V legacy sensors.
• SPI Interface Bridging: Facilitating high-speed data exchange between SD cards and 5V development boards like the Arduino Uno.
• Mixed-Voltage Systems: Connecting modern low-voltage ARM Cortex processors to industrial 5V TTL logic.

Applications:

• SD Card Interfacing: Safely managing the 3.3V requirements of SD cards when used with 5V logic systems.
• UART Level Shifting: Converting serial debug signals for safe PC communication via USB-to-TTL adapters.
• LCD and OLED Displays: Driving 3.3V display controllers from 5V power sources.

Equivalent Models:

• TXB0108: A similar 8-bit translator; however, the TXB version is better suited for push-pull only and lacks the internal pull-up resistors found in the TXS series.
• 4-Channel Logic Shifter (BSS138 based): A smaller alternative for systems requiring fewer data lines.
• LSF0108: A multi-voltage level translator from TI that offers similar bi-directional support across eight bits.

Package Includes:

• 1 x TXS0108E 8 Channel Bi-Directional Logic Level Converter Module
• 2 x 10-Pin Male Headers (Unsoldered)