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marcelo.baru
Joined: 19 Aug 2005
Posts: 9
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 22 Aug 2008 20:26 Looking for HV ESD Pad |
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1) Pad type: I/O Resistor-less HV analog pad. Also looking for HV power pads for Vdd and Vss.
2) Pad size: The pad sizes shall be less 92 um X 92 um.
3) Pad ring: I have both 3.3V and 15V rings in IO section, but they are
separeted. The sizes for the pad ring is less than 92 um X 65 um each for Vdd and
Vss.
4) Total pad size: Less than 92 um X 235 um.
5) ESD requirement: Large than 6 kV.
6) Operating frequency: low frequency application.
7) Power consumption of the pads: During operation, the analog pad should consume no power.
 Fabrication process: TSMC 0.35u 3.3V/15V 2P4M Polycide process.
Anyone experienced in this design or has something off-the-shelf that fits these requirements?
Thanks,
Marcelo
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mdcui
Joined: 23 Aug 2005
Posts: 95
Helped: 18
Location: China shanghai
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| 26 Aug 2008 3:16 Looking for HV ESD Pad |
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we have 12V tolerable pads in our design, and can resist 2000V HBM stress, not as high as your design, the key element we used in our design is:
1. SCR device (silicon controlled rectifier) shorted to vss.
2. special diode string to vss, turned on by an RC timer.
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ESDSolutions
Joined: 29 Jul 2008
Posts: 24
Helped: 7
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| 26 Aug 2008 14:27 Re: Looking for HV ESD Pad |
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We have recently worked on this same process node for HV application. I will check if I can link you directly to the IP provider that has these cells available including silicon proof.
Some further questions:
- Does the IO need Overvoltage/undervoltage tolerant support? --> Then a local protection clamp is required. Otherwise it may be possible to rely on 'dual diode' approach for the IO
- Total ESD area = 92um x 235um > 21.000 um2. This area is available for 1 power clamp between Vdd and Vss and some ESD protection from IO to Vdd /Vss. Correct?
- The leakage must be '0'. Is order of magnitude nA OK? Is this similar for the leakage at the power cell?
Good luck!
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marcelo.baru
Joined: 19 Aug 2005
Posts: 9
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| 26 Aug 2008 17:16 Re: Looking for HV ESD Pad |
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Thanks guys. ESDSolutions: I would appreciate if you can link me to the IP Provider. I will get back to you with the answers to your questions.
Thanks,
Marcelo
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ESDSolutions
Joined: 29 Jul 2008
Posts: 24
Helped: 7
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| 26 Aug 2008 18:58 Re: Looking for HV ESD Pad |
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Hi
ESD IP provider is Sarnoff Europe in Belgium.
http://www.sarnoffeurope.com/
Their HV background is shown here - strangly under the LCD driver applications
http://www.sarnoffeurope.com/node/127
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marcelo.baru
Joined: 19 Aug 2005
Posts: 9
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| 26 Aug 2008 19:59 Re: Looking for HV ESD Pad |
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| Thanks a lot.
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oxynitride
Joined: 17 Apr 2002
Posts: 25
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| 26 Aug 2008 23:32 Re: Looking for HV ESD Pad |
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Another supplier who can offer solution at much cheaper price is
http://www.qpx-europe.com/
good luck.
Oxy
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marcelo.baru
Joined: 19 Aug 2005
Posts: 9
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| 27 Aug 2008 1:29 Re: Looking for HV ESD Pad |
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| Thanks Oxy.
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