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TXU0104: The best solution for battery application

Hideki Hayashi1
Genius 10240 points

Part Number: TXU0104
Other Parts Discussed in Thread: SN74AVC4T245, SN74LV1T08, SN74LV4T125, SN74AUP1T17, SN74AUP1G34, SN74AUP3G34

HI team,

Can you please support to select right parts to satisfy below requirements?

Vcc_input = 1.8V

Input: High=1.4V~1.8V, Low=0V~0.4V

Vcc_output=2.2V~3.4V(battery)

Output (connected IO VIH/VIL): High>0.8 x Vcc_output, Low<0.2x Vcc_output

Direction = unidirectional

channel = 4ch

Current consumption: <1uA (as low as possible)

I think TXU0104, SN74AVC4T245, and SN74LV1T08 may work here. However, TXU0104 and  SN74AVC4T245 doesn't have enough to meet output requirement.

TXU0104 VOH = 76%, VOL = 23%, when IOH or IOL = 12mA.

image.png

And also, SN74LV1T08 looks meet the spec.

When Vcc=2.2V~3.4V, VIH=1.135V~1.35V, VIL=0.65V~0.71V, VOH=96%(2.3V),84%(3.3V) , VOL=9%(2.3V),8%(3V). Is it correct? can you please double-check?

Best regards,

Hayashi

  • 0
    TI__Guru 61061 points

    Hi Hayashi-san,

    We are still looking into this and will provide a response soon.

    Regards,

    Jack

  • 0
    TI__Mastermind 42490 points

    Hello Hayashi-san,

    Another alternative would be the SN74LV4T125. Similar specs as the SN74LV1T08 but supports 4 channels.

    Regards,

    Josh

  • 0 in reply to Joshua Salinas
    TI__Genius 10240 points

    Hi Joshua,

    Did you double check the LVxT family can work at the provided IO threshold?

    Regards,

    Hayashi

  • 0 in reply to Hideki Hayashi1
    TI__Mastermind 42490 points

    Hello Hayashi-san,

    There are no concerns with the input and output threshold for SN74LV4T125. The VOH and VOL threshold are posted below:

    • VOH=86%(2.3V), 83%(3.0V)
    • VOL=13%(2.3V), 15%(3.0V)

    Regards,

    Josh

  • 0 in reply to Joshua Salinas
    TI__Genius 10240 points

    Hi Joshua,

    Customer understand the input/output spec. But the current consumption of 4 solution is higher than what they have been using (SN74AUP1T17、SN74AUP1G34、SN74AUP3G34)

    1. Level-shifted AND gate SN74LV1T08 (single power supply)

    The current consumption is larger than expected as follows:

    Current consumption at 25°C (Max.): ICC 1uA + input leakage current 0.12uA × 2 ports = 1.24uA

    Current consumption at -40°C to 125°C (Max.): ICC 10uA + input leakage current 1uA × 2 ports = 12 uA

    2. 4ch buffer SN74LV4T125

    The current consumption is larger than expected as follows:

    Current consumption at 25°C (Max.): ICC 2uA + input leakage current 0.1uA × 4 ports = 2.4uA

    Current consumption at -40°C to 125°C (Max.): ICC 20uA + input leakage current 1uA × 4 ports = 24 uA

    3. Direction-controlled level shifter: SN74AVC4T245 (dual power supply)

    Since the connection destination of the output is a CMOS input with small current, the output voltage may meet the required specifications, but the current consumption is larger than expected.

    Current consumption at -40°C to 85°C (Max.): ICCA 8uA + ICCB 8uA + input leakage current 1uA × 2 ports = 18uA

    4. Fixed direction level shifter TXU0104 (dual power supply)

    The output voltage may meet the required specifications, but the current consumption is larger than expected.

    Current consumption at -40°C to 85°C (Max.): ICCA 2.5uA + ICCB 2.5uA + input leakage current 1.5uA × 2 ports + OE leakage current 1.5uA = 9.5μA

    [Question 1] For the four products above, is there any data showing that the current consumption (Max.) is smaller within customer product's operating temperature range of -10°C to 60°C?

    [Question 2] They previously used SN74AUP1T17, SN74AUP1G34, and SN74AUP3G34, which all have small current specifications (Max.) of less than 1uA even at -40°C to 85°C.

    Is it correct to understand that there are no ICs that have current consumption equivalent to SN74AUP1T17, SN74AUP1G34, and SN74AUP3G34 while satisfying the current input/output conditions?"

    Best regards,

    Hayashi

  • 0 in reply to Hideki Hayashi1
    TI__Mastermind 42490 points

    Hello Hayashi-san,

    1) Unfortunately, we don't have max current consumption data from -10C to 60C. We only capture data at certain temperature points. For example, in commercial devices we only record at -40C, 25C and 85C. In automotive parts, we only record at -40C, 25C and 125C.

    2) Looking at the parts, it seems we don't have a part that's able to meet the very low current requirements (as the AUP parts) while also satisfying the VIH/VIL and VOH/VOL conditions.

    Regards,

    Josh