Welcome to The Logic Minute by Texas Instruments. Today, we will be discussing the difference between TI's three auto bi-directional families and when to use each. Multi-master multi-slave protocols, such as I2C and SMBus allow any device to control the data line. Because these protocols have been popular for over 20 years, many devices will operate at different voltages, requiring the use of voltage translators.

Auto bi-directional voltage translators are used, because they can auto sense, which direction of device is transmitting and change direction accordingly. Shown are TI's three auto bi-directional voltage translator families. The TXB, the TXS, and the LSF.

The three devices look alike, operate similarly in applications, but today we will look at what makes them different. All three have auto direction sensing for two-way level voltage translation applications. The LSF family has the highest data rate at 200 megabits per second.

The TXB falls in the middle. And the TXS typically is used for slower applications. LSF and TXS have the flexibility of being used for both open drain and push/pull interfaces. And the TXB can only be used with push/pull drivers.

LSF utilizes switch-based passive signals. The TXS is similar to the LSF, but has added circuitry to improve signal integrity. And the TXB is similar to a buffer and has the best signal integrity.

Lastly, the devices all operate at similar Vcc voltage ranges. As TI, TXB is typically our first choice, especially for push/pull interfaces. It has a low input current and high signal integrity.

Secondly, we advise the TXS voltage translator for open drain interfaces, such as I2C and SMBus. Lastly, is LSF, which is simple and is very versatile and can be used in some applications, where TSX and TXB might not be able to used. If you're unable to use any of these voltage translators, we recommend looking at our direction controlled and unidirectional voltage translation families.

Thank you for watching. If you have any further questions, you can go to e2e.ti.com to us a question about any of these devices. If you enjoyed this video, please take a moment and watch our other videos on training.ti.com.