[SI-LIST] Re: How to know the powerconsuming of IC?

A few items to consider on physical layer digital ICs...

Input power with respect to internal termination resistors

Output termination method, and thus power dissipation, on internal pull 
resistors 

If measuring, either bench or ATE, ensure the part is in a correct operating 
state (i.e. don't let a 1.5V Bipolar CML output structure float which can 
result in saturation (excessive pre-driver current and thus a higher supply 
current measurement).

Many Bipolar Si and/or SiGe parts have a positive thermal coefficient, meaning 
as Tj increase, power increases.

Power dissipation varies with Fab parameters, and can swing +/-10% or more so 
you need a reasonable statistical sample size (multiple lots, corner 
parameters, etc.).

Kind Regards,
Kevin Hoffmann





--- On Fri, 11/21/08, Andrew Ingraham <a.ingraham@xxxxxxxx> wrote:

> From: Andrew Ingraham <a.ingraham@xxxxxxxx>
> Subject: [SI-LIST] Re: How to know the powerconsuming of IC?
> To: "SI LIST" <si-list@xxxxxxxxxxxxx>
> Date: Friday, November 21, 2008, 7:38 AM
> >  It is quite straightforward, just measure the current
> drawn from
> > different power supply (3.3, 1.2, 1.8 etc) of the IC
> under normal
> > operation.
> 
> For a digital IC, that is pretty much it.  There is some
> amount of DC input
> power that goes out through the output ports, but (except
> perhaps for
> something like ECL which has substantial static output
> current) it is
> usually much smaller than the power consumed (dissipated)
> by the IC.
> 
> You can simulate it, or you can measure it.
> 
> For a more analog type IC (such as a regulator), add up all
> the power into
> the IC on all its various pins (or subtract the power going
> out from the
> power going in).
> 
> Andy
> 
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