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SN74LVC1G125: Current Consumption of Buffer

Liren He
Prodigy 120 points
Part Number: SN74LVC1G125
Other Parts Discussed in Thread: SN74ALVCH162244

Hi TI experts,

we have some doubts about the current for the buffers which belong to 74-series.

We found that for single bus or 16 bit buffer, the continuous current through VCC are all 100mA. So we are curious about the current consumption about the buffer, it seems that no matter how much the channel number is, they consume the same current.

Is that right? Or are there other ways to calculate the maximum current consumption of the buffer?

Thank you!

  • 0
    TI__Mastermind 45855 points

    Hi Liren,

    The SN74LVC1G125 is a single buffer so I'm a little confused about the 16-bit part. However, with whatever your device you are using I can say that you probably shouldn't have that much current through VCC.  If you look at the abs max table for the SN74LVC1G125 , you will see that 100 mA is the absolute maximum amount of current that should go through the VCC pin before possible device failure. If the device is operating within the recommended operating conditions it shouldn't get close to that amount of current. There is probably a short or your input is too close to the threshold of the CMOS. I don't know what the outputs are connected to, but that could also be the issue if every output is driving a lot of current.

    As for how to calculate total power consumption see the image below:

  • 0 in reply to Dylan Hubbard
    Prodigy 120 points

    Hi,

    Thank you for your support.

    And sorry for my unclear description. For 16-bit buffer, I mean other devices, such as sn74alvch162244.

    So for multi-bit buffer, how to calculate the total power consumption? Are they same as the formula above?

    Thank you again!!!

  • 0 in reply to Liren He
    TI__Mastermind 45855 points
    Hi Liren,

    You can use the same formulas as above as well. You will see the Nsw variable which is the amount of channels you are using. A quick and easy calculation is just to calculate the static power consumption to get an estimate.
  • 0 in reply to Dylan Hubbard
    Prodigy 120 points
    Got it. Thank you so much.