• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 19 subscribers
  • Views 195 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.

SN74LVC1G17: Datasheet Information + Technical Question

Alex Segler
Expert 4261 points
Part Number: SN74LVC1G17

Hello team, looking at the data sheet for the SN74LVC1G17, I did not see any of this following information below. Can you please provide?

 

Absolute Maximum Junction Temperature (°C)

Recommended Operating Junction Temperature (°C)

Thermal Shutdown Junction Temperature (°C)

Junction-to-board thermal resistance (°C/W)

 

Also, what happens if the inputs are left open and VCC is connected.

Thank you!

  • 0
    TI__Guru* 96591 points

    Hi Alex,

    Alex Segler said:
    I did not see any of this following information below. Can you please provide?

    Logic gates are generally only specified for ambient operating temperature, however you can add the limitation of not exceeding 150C junction (this does not negate the ambient operating temperature range) - please let me know if you find a way to do that without massively violating the datasheet specifications, I would be very impressed!

    Junction to board case (bottom) thermal resistance is only provided for packages that have a significant connection to the PCB through either a WCSP package or thermal pad:

    Alex Segler said:
    Also, what happens if the inputs are left open and VCC is connected.

    This particular device only has one input to leave open, but the answer is the same for all CMOS logic devices. These are referred to as "floating inputs" and can cause oscillations, excessive current, and damage to the device. All inputs should be terminated at either VCC or GND.

    -

    FYI - these are some of the most commonly asked questions about logic. To see more, please visit our FAQ page. The search function also is quite good for E2E in helping people find answers to common questions.

  • 0 in reply to Emrys Maier
    TI__Guru 62055 points

    Hi Emrys,


    Would you confirm these are the correct answers to each line in the table?

    Absolute Maximum Junction Temperature (°C)

    Recommended Operating Junction Temperature (°C)

    Thermal Shutdown Junction Temperature (°C)

    Junction-to-board thermal resistance (°C/W)

    150C

    125C

    not available

    not available for  DBV package
  • 0 in reply to Collin Wells
    TI__Guru* 96591 points

    Hey Collin,

    The abs max junction temperature is good.

    I would recommend operating the junction at 25C instead of 125C. If you want to provide the maximum recommended ambient operating temperature, then 125C would work. We do not have a recommended junction temperature for this device (it is not a power delivery device...).

    Instead of just 'not available' for thermal shutdown junction temp, I would recommend putting 'not applicable' or N/A -- currently it sounds like we can't provide the value, but there is one whereas the device just doesn't have this feature/functionality. We should state clearly that this is not a feature of the device

    The junction-to-board thermal resistance is available -- it is 62 C/W

  • 0 in reply to Emrys Maier
    TI__Guru* 96591 points
    Emrys Maier said:
    Junction to board thermal resistance is only provided for packages that have a significant connection to the PCB through either a WCSP package or thermal pad:

    After writing my updated answer, I realized that I was incorrect here - I was thinking of the junction to case bottom (theta_jc(bot)) not the junction to board temperature. My mistake. The junction to board value is in the datasheet, which is what probably confused me since only the theta_jc(bot) values are not there.