TCA9617A: Finding a Level Shifter which fits to TCA9617A (1MHz)

Nicolai Adelhoefer

Part Number: TCA9617A
Other Parts Discussed in Thread: PCA9306, TCA9406, TCA9416

Hey,

I've got an I2C design which runs at Super Speed Plus (1MHz). At some point it has an TCA9617A.

The B Side (3.3V) is connected to a cable of 10 inch to another pcb. At this I've got an I2C Bus running at 1MHz 1.8V.

Do you know any Buffer/Level Shifter which is able to fullfill the requirements of connecting both busses? I2C Buffers runnning at 1 Mhz are pretty rare. And these which are available consists of a B side with a static voltage offset. So a B side cannot be conntected to another B side. But all B sides starts at a voltage of 2.2V... so I cant use the B side at the 1.8V side.

I thought about using a level shifting switch as well (like PCA9306), but these seme to be incompativle with the B sides as well.

                                      3.3V
       Aside                     Bside                  3.3V                 1.8V
       ┌────────────┐               ┌────────────┐
       │ TCA9617A               ├─────┤   ????? │
       │ 1MHz                         │               │                       1MHz    │
       └────────────┘               └────────────┘

Thanks a lot for your support!

Nicolai

over 4 years ago

0 Chris Ayoub over 4 years ago

TI__Genius 15345 points

Hi Nicolai,

What is the value of the voltage on the A side? Is there a reason why you can't just use the TCA9617A as your level shifter and you need another one?

This is a list of our I2C level shifters and buffers that can operate at 1MHz. The only other option would be the TCA9406. But as you said there are going to be concerns with the B-side not being able to operate at 1.8V and you can't connect two static offset voltage sides together.

Best,

Chris

0 Nicolai Adelhoefer over 4 years ago in reply to Chris Ayoub

Prodigy 30 points

Hey Chris,

Thanks a lot for your fast response!

The voltage on the Aside of TCA9617A may vary between levels of < 2.3V. Furthermore the part of the TCA9617A is already fixed. Thats why I need to adapt to this now. I only could replace it by a pin compatible device, but I could not find a suitable solution as well.

I cant see your list, but I think you refer to this https://www.ti.com/interface/i2c/level-shifters-buffers-and-hubs/products.html#p210max=1000;10000

I also saw the " TCA9416 - NEW - Ultra-low voltage I2C translator with rise time accelerators " but this is not yet in production.

Thank you for your time!

Best,

Nicolai

0 Chris Ayoub over 4 years ago in reply to Nicolai Adelhoefer

TI__Genius 15345 points

Hi Nicolai,

For some reason E2E does a horrible job highlighting links. If you move your mouse over "This is a list" you can see how bad of a job they did.

But you are correct that is the list I wanted to show you. I can email my marketing team if you'd like to see if we have an idea for a release date on that part.

Best,

Chris

0 Nicolai Adelhoefer over 4 years ago in reply to Chris Ayoub

Prodigy 30 points

Hey Chris,

ah okay... yeah I did not see that link :)

It would be nice if you could find out when its release is planned!

Thanks a lot!!

Nicolai

0 Chris Ayoub over 4 years ago in reply to Nicolai Adelhoefer

TI__Genius 15345 points

Nicolai,

Did you have a specific package and temp in mind. Apparently some of the variants will be released to market in July. The rest will be spread out through 3Q.

Best,

Chris

0 Nicolai Adelhoefer over 4 years ago in reply to Chris Ayoub

Prodigy 30 points

Hey Chris,

we need the SOT-23-T version.

Best regards

Nicolai

0 Chris Ayoub over 4 years ago in reply to Nicolai Adelhoefer

TI__Genius 15345 points

Hi Nicolai,

You can actually order that device right now:https://www.ti.com/store/ti/en/p/product/?p=PTCA9416DDFR

Best,

Chris

Edit: For some reason I can't make a new reply, but I was looking at the TCA9416 yesterday and I remembered that it wasn't a buffer. I just wanted to make you aware of that. It uses a pass fet.

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TCA9617A: Finding a Level Shifter which fits to TCA9617A (1MHz)