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SN74AUP1G17: High Delta Icc

Briguy
Prodigy 40 points
Part Number: SN74AUP1G17

Measuring SN74AUP1G17 Low-Power Single Schmitt-Trigger Buffer Delta Icc with 3.3V supply and 2V input results in >150uA of current.

Datasheet says 40uA max Delta Icc at room temp. 

Device is mounted to a breakout board. Current is measured with Keysight N6705B with N6781A SMU. input voltage is varied with second SMU in same chassis with shared GND.

Current is as expected when in normal Vih/Vil range, but not in region where Scmitt-Trigger is active.

Am I measuring this wrong? Why is it 3-4x the max listed in the datasheet?

  • 0
    TI__Guru* 97046 points

    Hello,

    The datasheet specification is at a specific condition:

    Max delta Icc at Vcc - 0.6V (looks like the minus sign was left out) has a max of 40 uA at room temp (25 C).

    The Icc will be larger than that value if you operate between 0.6V and Vcc - 0.6V.

    If you need extremely low power with a Schmitt-trigger device, you can use a comparator instead which will have a constant current draw regardless of the input state. CMOS logic devices will always draw more power based on the input voltage.

  • 0 in reply to Emrys Maier
    Prodigy 40 points

    So basically, the max listed delta ICC is not the max delta ICC. Ok thank you

  • 0 in reply to Briguy
    TI__Guru* 97046 points

    I understand the confusion and frustration, but it's clearly defined in most datasheets. In this one there's an error (minus sign missing) and we will get that fixed. This is true for _every_ logic device in the industry - not just TI devices and has been this way for decades. They all have delta Icc defined only for one DC condition rather than across the entire input voltage range.

    In our newer devices I do my best to always put in Icc plots so you can see not just the 2 conditions in the EC table but the entire range of Icc values. Unfortunately, we have a lot of older devices that have yet to be updated and it will take years for them all to get the updates. For now, at least you have a direct line to the engineers working on the parts to get info in nearly real time.