TXS0108E-Q1: Designing with TXS0108E

Vijay

Part Number: TXS0108E-Q1
Other Parts Discussed in Thread: TXS0108E

Hello Team,
We are planning to use the level translator TXS0108E for one of our applications.
The low voltage side is a 1.8V logic level and the high voltage side is a 3.3V logic side.
The signals are some IO pins so we need bidirectional level shifters.

I have seen some level shifters with direction control and some others with auto direction detection.
If we have auto direction detection, we would we need the direction control level shifters?
In SPI/I2C we cannot use direction control level shifters.

Also, we have some level shifters available using passive devices like MOSFET and resistors.

What is the advantage of using a dedicated level shifter IC over these passive devices?.

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 316760 points

The TXS works like this passive translator, but has edge accelerators. It has open-drain outputs.
TXB translators have very weak output drivers to allow other devices to override the voltage.
(And these translators do not actually detect the direction; the inputs and outputs in both directions are always active.)

Direction-controlled or fixed-direction translators have buffered inputs and outputs, so they are much more robust in most situations, i.e., they can be used with pull-up/-down resistors, and can driver larger loads.

0 Jack Guan over 1 year ago

TI__Mastermind 40216 points

Thank you Clemens for providing this answer.

Hey Vijay,

Please see the additional resources below for more information:

Voltage Translation Application Quick Reference

Common Risks of Discrete FET Voltage Translation and Advantages of TI’s Integrated 2N7001T Level Shifter

Let us know if you have any further questions.

Regards,

Jack

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TXS0108E-Q1: Designing with TXS0108E