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TXS0108E: TXS0108ERGYR

Sakthi K
Prodigy 110 points
Part Number: TXS0108E
Other Parts Discussed in Thread: TXU0304,

Tool/software:

Hi Team,

We are currently evaluating components for our SPI communication line and are considering the TXS0108ERGYR for voltage-level translation between VCCA (1.8V) and VCCB (3V).

To accurately assess its suitability for our application, we kindly request your assistance in providing the following information:

Current Consumption:

Static current consumption at VCCA = 1.8V and VCCB = 3V.
Dynamic current consumption during switching operations, if available.
Any relevant details on current consumption profiles or conditions affecting current draw.


Power Consumption:

Total power consumption under typical operating conditions.
Power consumption breakdown (if available) into components such as quiescent power and dynamic power.


Power Budget Analysis:

Guidance on integrating the TXS0108ERGYR into a power budget analysis.
Any thermal considerations or power dissipation figures that would be relevant to our design.

How to calculate total current and Power ?


Sample Request:

If possible, we would appreciate receiving a sample of the TXS0108ERGYR for evaluation purposes based on the information provided.
We value your expertise and look forward to your prompt response.

Best regards,

Sathiya

  • 0
    Guru 286060 points

    Why did you choose the TXS0108E? For SPI, the TXU0304 would be a better choice.

    See [FAQ] How do I Calculate Power Consumption or Current Consumption for my CMOS Logic Device? But for practical purposes, the power consumption of such a logic device is < 1 mA and can be ignored.

  • 0 in reply to Clemens Ladisch
    Prodigy 110 points

    Hi 

    TXU0304 is fixed direction, TXS0108E is Bi direction so we go with TXS0108E part.

    Regards,

    Sathiya

  • 0 in reply to Sakthi K
    Guru 286060 points

    But SPI uses fixed-direction signals.

  • 0 in reply to Clemens Ladisch
    Prodigy 110 points

    We have previously used the TXS0108E in other projects and have stock available. Could you please highlight any specific advantages of the TXS0108E that would benefit our current application?

  • 0 in reply to Sakthi K
    Guru 286060 points

    The TXS is a passive switch; the TXU buffers the signals.
    The TXS has internal pull-up resistors (so low-level signals use more power) and outputs open-drain signals (so you cannot use pull-down resistors). The TXU has high-impedance inputs and push/pull outputs; you can choose if and what pull-up/-down resistors to use.
    The TXS has edge accelerators, which are sensitive to noise.

    You certainly can use the TXS for SPI if you have a reason for it.

  • 0 in reply to Clemens Ladisch
    Prodigy 110 points

    Hi,

    I will discuses with my team.  

    Thank You.

  • 0 in reply to Sakthi K
    Prodigy 110 points

    Hi,

     I am interested in understanding whether TXU0304 would be suitable for integration into a wearable device comparing then TXS0108ERGYR.

    Could you please provide more detailed information or documentation regarding the following aspects of TXU0304:

    1. Size and Form Factor: Is TXU0304 compact and lightweight enough for wearable applications?

    2. Power Consumption: What are the typical power requirements of TXU0304? Is it suitable for low-power wearable devices?

    3. Functionality: What specific functions does TXU0304 support? How can it contribute to the functionality of a wearable device?

    4. Durability: Is TXU0304 designed to withstand the conditions typically encountered in wearable devices?

    5. Other Considerations: Are there any other characteristics or considerations that make TXU0304 particularly suitable (or unsuitable) for wearable device applications?

    6. is suitable for SPI communication  

    Additionally, if there are any application notes, datasheets, or technical documents and power budget calculation with example  available for TXU0304, I would greatly appreciate it if you could share them with me.

    Thank you in advance for your assistance.

    Regards,

    Sathiya

  • 0 in reply to Sakthi K
    TI__Mastermind 28121 points

    Hey Sathiya,

    The TXU0304 is especially suited for SPI signals due to its fixed direction, 4 channel configuration. Please see the product page for list of current app briefs for this device. 

    You may reference the datasheet of the TXU0304 for more details on package offerings and electrical ch. for power consumption specs (see section 7.5). The FAQ that Clemens shared, [FAQ] How do I Calculate Power Consumption or Current Consumption for my CMOS Logic Device?, provides an excel doc. that can be used to calculate power consumption. 

    Regards,

    Jack 

  • 0 in reply to Jack Guan
    Prodigy 110 points

    Hi Jack,

    Thank you for the information about the TXU0304. Its fixed direction and 4-channel configuration for SPI signals sound promising. I'll definitely check out the product page for the latest application briefs.

    I'll also refer to the datasheet of the TXU0304 to get more details on the package offerings and the electrical characteristics, particularly for power consumption specs as mentioned in section 7.5.

    Thanks again for your assistance.

    Best regards,

    Sathiya

  • 0 in reply to Jack Guan
    Prodigy 110 points

    Hi Jack,

    Thank you for your previous email and the information on the TXU0304 device. I am currently reviewing the datasheet and the application briefs as suggested. However, I have a question regarding the power analysis.

    The FAQ document shared by Clemens mentions using an Excel document for calculating power consumption of CMOS logic devices, specifying VCC. However, the TXU0304 has VCCA, VCCB, . Could you please clarify which of these should be used for the power analysis calculations?

    Can you share me the any example  calculation with reference. 

    Your guidance on this matter would be greatly appreciated.

    Best regards,

    Sathiya

  • 0 in reply to Sakthi K
    Guru 286060 points

    You can treat a level shifter as two separate devices with their own power supplies, i.e., you would have TXU0304-A with three inputs and one output, and TXU0304-B with three outputs and one input.

  • 0 in reply to Clemens Ladisch
    Prodigy 110 points

    Hi jack,

    Thank you for your reply  regarding treating a level shifter as two separate devices with their own power supplies, such as TXU0304-A and TXU0304-B. This approach is helpful in certain applications for managing power consumption and signal integrity.

    Regarding the TXS0108E, which I am also evaluating, I have noticed that the datasheet does not specify detailed operating current information beyond the supply current under ideal conditions (Icca = 2 µA, Iccb = 6 µA). To proceed with our evaluation accurately, I would appreciate your assistance in providing the following information:

    1. Operating Current Details: Could you please provide information on the typical operating current consumption of the TXS0108E during active operation? Specifically, I am interested in understanding how the current consumption varies with different input conditions (high, low) and switching frequencies.

    Thank you once again for your support. I look forward to your response.

    Best regards,

    Sathiya

  • 0 in reply to Sakthi K
    TI__Mastermind 28121 points

    Hey Sathiya,

    During active operation (when the device is switching), dynamic power consumption would need to be evaluated, which depends on PT , PLC , and PLR as shown in the FAQ. You can find the Cpd values for the evaluation in section 5.14 as shown below: 

    Regards,

    Jack