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operating current

Discussion in 'General Electronics Discussion' started by PRIYADHARSHINI, Apr 15, 2015.

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  1. PRIYADHARSHINI

    PRIYADHARSHINI

    137
    8
    Feb 6, 2014
    Hi all

    how do we know the current required for driving the IC?
    That is from which parameter of the datasheet we can calculate the current required to drive the components(Such as IC)?
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,310
    2,588
    Nov 17, 2011
    Which IC?

    Different manufacturers use different partameters to indicate power consumption, even a single manufacturer may use different parameters for different ICs.

    A good starting point is to serach for paameters like "power dissipation", "Icc" or similar.
    Note that these parameters typically do not include addtional current that is driven by the IC's outputs into loads.
     
  3. davenn

    davenn Moderator

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    Sep 5, 2009
    the datasheet will tell you how much current the IC requires

    see this example for a TL072 Op-Amp ....
    I have hilited the current requirement

    OP-amp.JPG
     
    PRIYADHARSHINI likes this.
  4. davenn

    davenn Moderator

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    Sep 5, 2009
    Any IC ...... which is why I was away getting an example, Harald ;)

    Dave
     
  5. PRIYADHARSHINI

    PRIYADHARSHINI

    137
    8
    Feb 6, 2014
    Thanks for your reply
    AT45DB161E -Flash IC
    MCP79411 - RTC
    24LC1025-I/SN - EEPROM
    CY8C3866AXI-040 - Cypress
    DG408L - MUX
    MC34063AD - SWITCHING REGULATOR
    and SN75176 - RS485 IC
     
  6. davenn

    davenn Moderator

    13,802
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    Sep 5, 2009
    ok well do some googling for datasheets on those chips like I did for my example and look in the electrical characteristics section
    after doing that for each of your chips and you have any queries
    ask specific questions about specific chips and link to the datasheet you found

    Dave
     
  7. PRIYADHARSHINI

    PRIYADHARSHINI

    137
    8
    Feb 6, 2014
    K..I will list the things which i have understood..

    1. Flash Ic - 12mA
    2.RTC - 3mA
    3.EEPROM - 5mA
    4.Cypress - 9 mA(It depends upon our frequency)
    5.Mux - 0.7mA
    6.Switching Regulator - 4mA
    7.SN75176 - 35mA(Its confusing for me I should take IOL or IOH)

    and how can we identify the parameter defines that the current required for each pin of the IC?
    and for CMOS technology they define as IDD right?
     

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    Last edited: Apr 15, 2015
  8. davenn

    davenn Moderator

    13,802
    1,941
    Sep 5, 2009
    Those data image posts are great, you are on the right track :)
    I could see power supply current on them and on several also the output current capabilities
    Keep in mind note all chips can source output current, some sink current instead .... all depends on the type of chip and the datasheets will again give that info

    Now to the bit you wrote that I quoted above ....
    input pins, normally don't "require" a given current as such ( sorta yes and no) ;)
    its more about what the maximum input current the input can tolerate before you kill the input/chip

    does that make sense ?

    if not someone else may be able to elaborate on that for you

    cheers
    Dave
     
  9. PRIYADHARSHINI

    PRIYADHARSHINI

    137
    8
    Feb 6, 2014
    k..thanks for ur guidance....
     
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