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TXB0108RGYR

TITXB0108RGYR

Texas Instruments
Voltage Level Translator Bidirectional 1 Circuit 8 Channel 100Mbps 20-VQFN (3.5x4.5)
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Overview

The TXB0108RGYR is an 8-bit bidirectional voltage-level translator featuring automatic direction sensing. It allows for seamless data transfer between devices operating at different logic levels, supporting VCCA from 1.2V to 3.6V and VCCB from 1.65V to 5.5V. This part is ideal for interfacing low-voltage processors with higher-voltage peripherals without the need for a direction-control signal.

Why Choose This Part

The auto-direction sensing capability eliminates the need for a dedicated DIR pin, simplifying PCB routing and reducing MCU pin count. It supports high-speed data rates up to 100Mbps and includes Vcc isolation, ensuring that if either Vcc input is at GND, all outputs are in a high-impedance state. Additionally, the loff circuitry supports partial-power-down mode operation to prevent damaging backflow current.

Applications

I2C/SPI Level Shifting
Translating logic levels between a 1.8V microcontroller and 3.3V or 5V sensors and memory devices.
SD Card Interfacing
Bridging the voltage gap between low-voltage SoC I/O cells and standard SD card operating voltages.
Legacy Peripheral Support
Connecting modern ultra-low-power MCUs to 5V legacy industrial or automotive communication controllers.
GPIO Expansion
Providing bidirectional level translation for general purpose I/O lines in mixed-signal system designs.

Key Specifications

Features Auto-Direction Sensing
Data Rate 100Mbps
Output Type Tri-State, Non-Inverted
Channel Type Bidirectional
Mounting Type Surface Mount
Package / Case 20-VFQFN Exposed Pad
Voltage - VCCA 1.2 V ~ 3.6 V
Voltage - VCCB 1.65 V ~ 5.5 V
Translator Type Voltage Level
Number of Circuits 1
Channels per Circuit 8
Operating Temperature -40degC ~ 85degC (TA)
Supplier Device Package 20-VQFN (3.5x4.5)

Getting Started

To use the TXB0108, ensure that VCCA is always less than or equal to VCCB and that the OE (Output Enable) pin is tied to VCCA through a pull-down resistor to ensure high-impedance during power-up. For evaluation, use the TXB0108EVM or similar breakout boards. Note that this device is designed for push-pull CMOS outputs and may not be suitable for open-drain applications like standard I2C without careful consideration of pull-up resistor values.

Part of TXB0108 level shifters family » TXB0108

TXB0108 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Package Stock
TXB0108RGYR (this part) VFQFN-20 —
TXB0108 UFDFN-20 5,349

Also Consider

TXS0108E TITexas Instruments - Designed specifically for open-drain applications like I2C while still providing 8-bit bidirectional translation.
LSF0108 TITexas Instruments - Offers a wider translation range and higher speed potential for systems requiring ultra-low latency.

Categories

Interface ICs > Level Shifters