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I/O pad simulation : calculation of drive current ,pull-up and pull-down resistances

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dileep4111

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What is drive current for a PAD and how to decide drive current for I/O PAD while doing characterization.Also how to calculate the pull-up and pull-down resistance for I/O pad cells.

Thanks
 

What is drive current for a PAD
The current which can be driven by the output buffer of the pad.

how to decide drive current for I/O PAD while doing characterization.
While doing characterization you measure - you can't decide on your results (just if they are reasonable).

how to calculate the pull-up and pull-down resistance for I/O pad cells.
Depends on requirements (customer's or yours).
 
How should i characterize the drive current of pad. Currently i am using Spectre tool from cadance.
thank you
 

Which type of pad? Analog or digital? Output only or I/O pad?
 

It is I/O PAD

Again: Analog or digital? Provide its schematic!

BTW: Slowly I'm running out of endurance, if you're not even willing to provide the info necessary to be able to respond to your questions!
 
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It is a bidirectional Digital PAD from TSMC
 

So why don't you simply have a look into the respective TSMC Standard I/O Lib Data Book? E.g. this one: TSMC_0,18u_Std_IO_lib_cover.gif
If you rightfully got the schematic and/or layout of the cell, you'd have access to it, too. There you can find the drive capabilities:
Pls. notice the correlation between a part of the cell name and its drive capability!


If you want to simulate: Enable the output, set a logic input voltage, measure the output current, either in short circuit mode, or into a known output load up to your requirement. Repeat this for the other logic input voltage.

Hope this helps!
 
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