• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 34 subscribers
  • Views 563 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TCA9801: TCA9801 and TXS0102

Takashi Yamaguchi
Genius 13890 points
Part Number: TCA9801
Other Parts Discussed in Thread: TXS0102, PCA9306

Hi team,

My customer is considering TCA9801 or TXS0102. Could you support the questions below?

1. TCA9801 has only DGK package. Do you have a plan to develop small package like DCT, DCU, DQE, DQM, and YZP with TCA9801?

2. TXS0102 seems to have internal pull-up resistor 10kohm on both Ach and Bch. Could you tell me the accuracy of the pull-up resistor?

3. What is the difference in features between the TCA9801 and TXS0102?

4. Can you introduce another I2C level shifter with lower leakage current and smaller package other than TCA9801 and TXS0102 if you have?

Although the TXS0102 has a smaller leakage current than the TCA9801 and a smaller package, customer is concerned about the increase in system verification time due to the built-in pull-up resistor. 

Regards,

Yamaguchi

  • 0
    TI__Guru 53575 points

    Hi Yamaguchi-san,

    1. TCA9801 has only DGK package. Do you have a plan to develop small package like DCT, DCU, DQE, DQM, and YZP with TCA9801?
    I'm not aware of any plans to add a smaller package option for this or similar devices. I'll double check on this and get back to you if I find out differently. 

    2. TXS0102 seems to have internal pull-up resistor 10kohm on both Ach and Bch. Could you tell me the accuracy of the pull-up resistor?
    I don't have this value readily available, but the expected current through these pins should not deviate from the graphs on the datasheet by more than 10% under the same test conditions. I expect the accuracy of the internal pull-ups to be better than this margin. 

    3. What is the difference in features between the TCA9801 and TXS0102?
    TXS0102 is a pass-FET voltage translator. This device allows translation of I2C signal between different voltage levels by connecting both sides when either side drives low. However, this device does not buffer capacitance on the I2C bus. This means that when active, the capacitance from both sides of the bus will be present and should be considered for meeting the I2C specification. 
    TCA9801 is an I2C buffer which does buffer bus capacitance. Because this device re-drives the signal on either side, the capacitances from either bus are separated and will not impacts the other's rise-time. 

    4. Can you introduce another I2C level shifter with lower leakage current and smaller package other than TCA9801 and TXS0102 if you have?
    PCA9306 is one of our more popular I2C level-shifters that is available in a variety of package types including DQE. This device also does not include the integrated pull-up resistor so this can be included externally which may help with your customer's verification time. Will this device suit your needs or do you require certain features of the other devices?

    Let me know if you have any more questions.

    Regards,
    Eric Schott

  • 0 in reply to Clemens Ladisch
    TI__Guru 53575 points

    Hi Clemens,

    Thanks for the clarification on this. I'm surprised to see that much tolerance for this resistor, but it makes sense given the full range and capabilities of the simulation. 

    Regards,
    Eric Schott