(This is a follow-up to an earlier question of mine.)

I would like to use the GTL2000 bi-directional translator IC to facilitate level translation between a 3.3V circuit and a 5V circuit (including bi-directional Digital and Analog I/O, SPI, I2C lines, etc.)

Now the datasheet of the GTL2000 convinces me that this is the right IC for the job. However, at certain points, the datasheet describes the GTL2000 as a "low voltage translator" and that it does "voltage level translation".

So before I order the part, I am trying to understand what this means -- What is the difference between a voltage-level translator versus a logic-level translator? Can I use this IC in the application I stated above?

  • \$\begingroup\$ What exactly do you mean by "bidirectional analog I/O"? \$\endgroup\$
    – Dave Tweed
    Commented Dec 14, 2012 at 12:19
  • \$\begingroup\$ @DaveTweed: The "bi-directional" was a prefix for the Digital lines, and by Analog I/O, I was referring to Analog input and "Analog"/PWM-output \$\endgroup\$
    – boardbite
    Commented Dec 14, 2012 at 13:57
  • 3
    \$\begingroup\$ Just as long as you understand that the GTL2xxx devices are only going to function as a clamp for analog inputs, and probably somewhat nonlinear at that. If you want analog inputs scaled from one range to another, you'll need to use a resistive voltage divider instead. \$\endgroup\$
    – Dave Tweed
    Commented Dec 14, 2012 at 14:34
  • \$\begingroup\$ Ah, thanks, that would be important! Just read through the datasheet and I think I understand why this is now. Wonder if I can find parts that incorporate multiple resistive dividers for the more-than-one analog lines in my case. \$\endgroup\$
    – boardbite
    Commented Dec 15, 2012 at 6:41

1 Answer 1


Yep, this will work just fine. Here is a great article on voltage level translation that Anindo Ghosh shared with me that explains all the different types of voltage translators: http://www.ti.com/lit/an/scea035a/scea035a.pdf

Logic Level = Voltage Level

In a 5v system, 5v(voltage) is high(logic) and 0v(voltage) is low(logic) and same for 3.3v...


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.