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Pricelist: Retail Price (B2C) Pricelist
TXS0108E High-Speed Full Duplex 8-Channel Logic Level Converter

TXS0108E High-Speed Full Duplex 8-Channel Logic Level Converter

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SpecificationDetails
IC ChipsetTexas Instruments TXS0108E
Low-Side Voltage (VCCA)1.2V to 3.6V
High-Side Voltage (VCCB)1.65V to 5.5V
Channels8-Bit (Octal)
Data Rate (Push-Pull)Up to 110 Mbps
Data Rate (Open-Drain)Up to 1.2 Mbps
Direction ControlAuto-Sensing (No DIR pin required)
PackageTSSOP-20 / Module with Headers
Price
₹ 67.80 ₹ 67.80
(Tax included)

Barcode: 6431282

Product Description

The TXS0108E Logic Level Converter is an essential tool for modern electronics prototyping where mixed-voltage systems are common. The module is split into two sides: Port A (low voltage) and Port B (high voltage). It utilizes an edge-rate accelerator circuit to maintain signal integrity at high frequencies, ensuring that square waves remain sharp even at $110Mbps$. The "Full Duplex" capability allows data to flow in both directions simultaneously across all eight channels. The module also includes an Output Enable (OE) pin, which can be pulled LOW to place all I/O pins in a high-impedance state, effectively isolating the two circuits during power-up or sleep modes.

Key Features

  • Auto-Direction Sensing: Simplifies software and PCB routing by eliminating the need for a direction-control signal.

  • 8-Bit Versatility: Shift an entire data bus (e.g., 8-bit parallel) or multiple serial lines (SPI + UART + I2C) using a single chip.

  • Wide Voltage Range: Supports everything from legacy 5V systems down to ultra-low 1.2V mobile processors.

  • Push-Pull & Open-Drain Support: Compatible with both standard CMOS outputs and I2C-style pull-up architectures.

  • Breadboard Friendly: Comes as a compact module with $2.54mm$ pitch headers for easy integration.

Technical Details

  • VCCA Constraint: $VCCA$ must always be less than or equal to $VCCB$ ($VCCA \leq VCCB$).

  • OE Pin Logic: The OE pin is referenced to $VCCA$. It should be tied to $VCCA$ for normal operation.

  • No Pull-up Needed: For most push-pull applications, the internal circuitry handles the transitions without external resistors.

Prototyping and Engineering Tips from Robogears

  • The OE Pin Trap: A common mistake is leaving the OE (Output Enable) pin floating. The TXS0108E requires the OE pin to be pulled HIGH (to $VCCA$) to enable the outputs. If left disconnected, the module will stay in high-impedance mode and won't shift any signals.

  • VCCA vs. VCCB Rule: Always ensure your lower voltage source is connected to $VCCA$. If you accidentally swap them (putting 5V on $VCCA$ and 3.3V on $VCCB$), the chip may overheat or fail to translate correctly.

  • Decoupling is Key: High-speed switching creates power supply noise. Always place a $0.1\mu F$ ceramic capacitor as close as possible to the $VCCA$ and $VCCB$ pins of the module to prevent "glitching" in your data streams at high speeds.

  • I2C Considerations: While this chip works for I2C, if you are using long cables or high-capacitance buses, the TXB0108 or a dedicated I2C shifter (like the PCA9306) might be more stable. The TXS series is optimized for "system-to-system" PCB traces.

Package Includes

  • 1 x TXS0108E 8-Channel Logic Level Converter Module

  • 2 x 10-Pin Male Headers (Unsoldered)

Disclaimer

The TXS0108E is a high-speed CMOS device. Ensure proper ESD precautions when handling. This module is not a power converter; it shifts logic signals, not power rails. Do not attempt to draw significant current from the data pins.