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ESD protection for multi-supply (Read 5653 times)
newic
Senior Member
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Posts: 138
ESD protection for multi-supply
Mar 18
th
, 2015, 11:38pm
Hi
How is the ESD protection scheme for multi-supply system? I am more concerns on ESD event from VDD1 to VDD2, assume VDD2 is a reference during ESD event.
I read some books that recommends to add bidirectional diode between 2 supplies. But it will cause leakage during power up event. is it a practical solution?
Is there any good solution?
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newic
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Re: ESD protection for multi-supply
Reply #1 -
Apr 14
th
, 2015, 7:41pm
any expert can comment??
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RobG
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Bozeman, MT
Re: ESD protection for multi-supply
Reply #2 -
Apr 15
th
, 2015, 2:49am
I'm not even close to an expert, but the Vdd pads I see these days have a snapback device between the pad and ground. This protects each Vdd pad
relative to ground
so there is no need to put diodes between the separate Vdds.
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newic
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Re: ESD protection for multi-supply
Reply #3 -
Apr 16
th
, 2015, 12:54am
hi
It is true that each supplies has a clamp between vdd1/2 to vss.
But the clamp will not turn on if Vdd1 & Vdd2 did not have a common ground. The charge can go from vdd1 to vdd2 through the level shifter circuit instead of going through vss. assume Vdd1 pairs with vss1 while vdd2 pairs with vss2.
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RobG
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Bozeman, MT
Re: ESD protection for multi-supply
Reply #4 -
Apr 16
th
, 2015, 1:53am
I guess you would have your snapbacks between the vdd pads and a common line, such as substrate or one of the vss lines. Then put back-to-back diodes between the vss pads.
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newic
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Posts: 138
Re: ESD protection for multi-supply
Reply #5 -
Apr 16
th
, 2015, 10:13pm
Hi RobG,
it is not a snapback ESD device at the power supplies.
CMOS RC-Triggered MOSFET ESD Power Clamp is used instead.
Is there a problem?
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RobG
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Bozeman, MT
Re: ESD protection for multi-supply
Reply #6 -
Apr 17
th
, 2015, 7:08am
Yes, same idea. I see my Vdd pads use the RC clamps.
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newic
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Posts: 138
Re: ESD protection for multi-supply
Reply #7 -
Apr 22
nd
, 2015, 1:13am
thx!!
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