operating current

[PRIYADHARSHINI]

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)?

 

[Harald Kapp]

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.

 

[davenn]

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

 

[davenn]

Which IC?

Any IC ...... which is why I was away getting an example, Harald

Dave

 

[PRIYADHARSHINI]

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

 

[davenn]

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

 

[PRIYADHARSHINI]

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?

 

[davenn]

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?

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

 

[PRIYADHARSHINI]

k..thanks for ur guidance....