• State Resolved
  • Locked Locked
  • Replies 6 replies
  • Answers 1 answer
  • Subscribers 19 subscribers
  • Views 290 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

SN74LVC2G07: Two Output Currents?

Go Bravos
Expert 6090 points
Part Number: SN74LVC2G07

Team,

There are two output currents listed in the datasheet for the SN74LVC2G07.  How do I interpret this?

 

Thank you.

  • 0
    Guru 268780 points

    There are different electrical characteristics specified for these two currents.

    But listing both of them in this table does not make sense.

  • 0 in reply to Clemens Ladisch
    TI__Guru* 96681 points

    Hello,

    I_OL is a test condition used to determine V_OL. Depending on which value of V_OL you are trying to meet, you can select either of these two values as your maximum current when using a 3V supply.

  • 0 in reply to Emrys Maier
    TI__Expert 6090 points

    Emrys,

    The screenshot from the datasheet that I sent is stating two different IoL specs for one VCC with no other column to differentiate the two.  I’m trying to sell off a design stating that the buffer is capable of sinking 24mA but I’m not sure because of the ambiguity of the datasheet.

    Please advise.

  • 0 in reply to Go Bravos
    Guru 268780 points

    These IOL values are not a specification but a test condition.

    If the voltage drop must be at most 0.4 V, you can sink up to 16 mA.
    If the voltage drop must be at most 0.55 V, you can sink up to 24 mA.

    The buffer is capable of sinking up to 50 mA (the absolute maximum rating), but the voltage drop will be even higher (and is not guaranteed).

  • 0 in reply to Go Bravos
    TI__Guru* 96681 points

    Hi,

    24mA is the recommended maximum output current if you want to limit the output voltage to 0.55V, 12mA is the recommended maximum output current if you want to limit the output voltage to 0.4V maximum. These are both _recommended_ maximum values, not limits of the device.

    In your case, the maximum output voltage will be 0.55V when sinking 24mA. Is this acceptable in the system design?

    The maximum output sink current of the SN74LVC2G07 is 50mA per channel (absolute maximum ratings table). 24mA is well below the maximum rating, so there should be no concern of damage. The only concern would be if the output voltage is too high for the system to operate correctly.

    If a lower voltage is required, channels can be paralleled to increase drive strength and reduce voltage by half.

  • 0 in reply to Clemens Ladisch
    TI__Guru* 96681 points

    Much more concise than my reply -thanks Clemens.