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What are the ESD spacers and where to place them?

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katrin

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what is spacers ?

but I just found out there are ESD spacers from the standard library with width like 50um, 100um...

should I place these spacers between ESD pads?

Or if I don't use spacer, just use metal, are there any consequence?
 

urgent help!

on consequence, but you need keep same space as required by preocess
 

    K

    katrin

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Re: urgent help!

Do not leave gaps.

It makes a lot of difference.
 

    K

    katrin

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Re: urgent help!

Don,t leave any gap it incresses the parasitic as well as the area.
 

    K

    katrin

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Re: Do I need to place spacer between the ESD pads?

It seems like the spacers are made up from some diodes
so if the people place spacers between the ESD pads, the area of diode will increase

If I just connect the ESD pads together with large metal layers(as the power supply on ESD pads form the power ring), there will be some gaps? I am still a little confused what do you refer to as GAP?
 

Do I need to place spacer between the ESD pads?

Why connect different pads?One pad for one signal right?
 

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    katrin

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Re: Do I need to place spacer between the ESD pads?

yes, one ESD pad for one signal
 

Do I need to place spacer between the ESD pads?

Honestly I do nor know what you mean by "spacers" but it might be that those are the ESD structures between VDD/GND. In general you have ESD protection on I/Os for each signal but to provide path under any conditions usually you have to put some additional structures between power rails. Those you can place anywhere (theoreticaly) and so it those spacers are mede from "some diodes" it might be they they serve this purpose.
Go through the ESD design rules for your process to make sure.
 

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    katrin

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