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TS12A12511: Does this part have the excess current consumption issue that most CMOS logic circuits have?

Lauren Mayfield
Expert 7925 points
Part Number: TS12A12511
Other Parts Discussed in Thread: TS3A44159,

Hi team,
I have a question for this part. 

1. Is this part one of our devices that circumvents the excess current consumption issue mentioned here in this app note: 

It mentions that "Texas Instruments has several analog switches that are designed to accept control signals from a low-voltage microprocessor and solve the excess current consumption issue. • Analog switches with low control input threshold – These are devices with control inputs designed to have a switching threshold voltage lower than half of V+. This feature helps reduce current consumption when control signals are input from a low voltage GPIO. However, the control input threshold voltage is dependent on V+. If V+ is connected to VBATT, the threshold decreases as the battery discharges. The TS3A44159 is an analog switch that uses this type of low-voltage control inputs." Since the enable high threshold for this part is x1/3 the supply, will the excess current consumption be an issue for this part? I'm guessing not.

2. In that same document - it mentions "static current consumption". Isn't that just the leakage current when the part is OFF? So for this part it would be 50nA, is that correct?

Thanks!
Lauren

  • 0
    TI__Guru 52392 points

    Hi Lauren,

    To answer your questions:

    1. The TS12A12511 does meet the requirement of V_IH(min) <= VCC/2. This means that the positive supply current is going to be near the typical value listed in the datasheet depending on the power supply provided by the part. For example for a single side voltage of 5V when the select voltage w.r.t. ground = 5V or 0V we will be near 20nA of supply current at room temperature. So this part should not have excessive current issues.

    2. Static current consumption is the max supply current consumption at Full Temperature and the control voltage is at VCC or 0V w.r.t. Ground. So for this part it would be 1uA. However depending on supply this part has a typical supply current of 20nA to 70nA at room temperature with the control voltage at VCC or 0V w.r.t. Ground - so the 1uA is when the full range temperature is taken into account.

    If you have any questions please let me know!

    Best,

    Parker Dodson

  • 0 in reply to Parker Dodson
    TI__Expert 7925 points

    Thanks for your help Parker!

    Do you know what the static current consumption would be if the Din was 3V (supply still 5V)?

    Thanks,
    Lauren

  • 0 in reply to Lauren Mayfield
    TI__Guru 52392 points

    HI Lauren,

    Due to this being an older part - it doesn't seem like we have this information available. What I can say is that it will not be at the maximum current draw due it being above threshold by 600mV, but there will most likely be a higher current draw then what is spec'd at 5V, and this could be quite a bit higher than the number in the datasheet. 

    That being said, can I ask what the end application is and why you are looking this part in particular? Also is there a certain power budget that is trying to be met by this part?

    Best,

    Parker Dodson