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IO pad selection in smaller technology

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gold_kiss

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IO pad selection

Hi,
say i have a design that i am migrating to smaller feature technology. Can anyone tell me wht are the key points that i should note while i select equivalent IO pads in this smaller technology.

cheers,
Gold_kiss
 

Re: IO pad selection

I need some doc about IO pad with Core cell.How to design them?
why IO is 3.3V and Core is 2.5V?
If IO is 3.3V but Core is 1.8 or less 1.8V, Can core work?
 

Re: IO pad selection

Hi GoodMan,

For your question on why IO is either at 3.3V or 5V and core at 2.5V or 1.2V or 1.8V is that the chip will interface with external world which is in all case working about 3.3V hence the chip interface voltage should be compatible with the external world. And its the IO pad that make this interface.

For the core should work at low voltage for various other reasons like low power consumption etc.

Thanks,
Gold_kiss
 

Re: IO pad selection

anyone, please give some documents about i/o selection
 

IO pad selection

you need to consider , power, speed, slow rate, driver strength , package , layout bounding(double , triple etc) to select IO pad ,
 
Re: IO pad selection

Hi,
thanks for replies...if anyone did want to give their valuable input they sure should.

But here is few of my points that I considered while I choosing/replacing
1) Functionality
2) slew rate
3) current
4) speed
5) power dissipitation
6) propagation delay
7) load (output capacitance)

Cheers,
Gold_kiss
 

Re: IO pad selection

1) PAD's current drive ability must be equal;

2) PAD's IO supply must be equal;




gold_kiss said:
Hi,
say i have a design that i am migrating to smaller feature technology. Can anyone tell me wht are the key points that i should note while i select equivalent IO pads in this smaller technology.

cheers,
Gold_kiss
Click to expand...
 

Re: IO pad selection

GoodMan said:
I need some doc about IO pad with Core cell.How to design them?
why IO is 3.3V and Core is 2.5V?
If IO is 3.3V but Core is 1.8 or less 1.8V, Can core work?
Click to expand...

Of course, they can work. But the IO need to have level shift fucntion.
 

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