The TXB010x and the TXB030x are categorized under the TXB-Type translators supporting level shifting of auto-bidirectional signals. While both devices share similar architecture, the differences in one-shot architecture and buffering circuitry enable them to support different use cases. To achieve optimized signal integrity, system designers need to be mindful of the output loading considerations, as well as other guidelines documented in this application note.
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TI’s level translation portfolio includes Auto Bi-Directional, Direction Controlled, and Fixed Direction translators. The TXB-Type level shifters fall under the Auto Bi-Directional translators and can support push-pull driver signals capable of direction change per channel (for example, QSPI). To achieve this functionality, the TXB’s I/Os are designed with weak DC drive strength to allow outputs to override existing inputs when the signal changes direction. As a result, the recommendation is that the system designers do not use the TXB to drive signals through long traces or high loads due to the weakened output drivers. Instead, the Fixed-Direction Voltage Translators are suggested.
For a list of recommended level translation devices for common interface types please visit TI’s Voltage Translators and Level Shifters page.