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How do we calculate the power consumption of buffer IC ?

user6159160
Prodigy 170 points
Other Parts Discussed in Thread: SN74LVC1T45

Hi,

We are currently working on a project with 100 buffer ICs approximately. Which are mainly based on TI logic families like LV, LVC, FCT, LS. Example SN74LVC1T45, SN74LVC8T245MP. How do we calculate the power consumption of each IC?

Thanks,

Jivesh

  • 0
    TI__Genius 16725 points

    Hi Jivesh,

    Please refer to the following slide.

    Thanks!

    -Karan

  • 0 in reply to Karan Kotadia
    Prodigy 170 points
    Hi,
     
    By using the formula provided by you, we were not able to come to a conclusion because in datasheet they haven't provided many details like Cpd, RL values.. But we have assumed some approximate values and not sure if it is correct or not. I have attached an excel document below. And we still need to look for the following buffer ICs SN74LVC1T45MDCKREP, IDT74FCT3245APGG8, SN65HVD33MDREP, AM26LS32AMFKB, SN74LVC08AMDREP.POWER_BUFFER.xls
    Thanks,
    jivesh
    Karan Kotadia said:

    Hi Jivesh,

    Please refer to the following slide.

    Thanks!

    -Karan

  • 0 in reply to user6159160
    TI__Genius 16725 points

    Hi,

    Not all the parts you listed are logic IC's. The slide I gave you would refer only to the logic parts like lvc1t45 or lvc08 which do have the Cpd values listed in their datasheets. Your excel sheet looks good to me and seems to calculate the correct power consumption for the logic parts.

    I notice you are using EP parts. Is this a military or space application? I have notified our experts on the space parts, as they might already have power consumption data for you for those parts.

    Thanks!

    -Karan

  • 0 in reply to Karan Kotadia
    TI__Guru 62930 points

    Jivesh,

    The 2 EP logic devices use the same Cpd methodology, and this is included in the datasheet.

    For the other devices, I would suggest that you post an E2E questions for each.  This helps tracking, and will direct to correct support.

    You noted that DS does not have the resistive load values.   These are of function of your circuit, and not the device.

    It does not look like you are using Rl in your spreadsheet.

    However, you show 50ohms in F21.  Most logic devices cannot adequately drive a 50ohm load as you have.

    If this answers your question, please click "This Resolved My Issue"
    Regards,
    Wade

  • 0 in reply to Karan Kotadia
    Prodigy 170 points

    Thank you,  karan. It is for military application.