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Per my experience ,Diodes + RC-Control , inverter and PowerClamp is better for out pad" q Y9 C2 _, L, Y, a/ i# b0 ~
Generally speaking ,the root cause of ESD failed is from below.
$ ^6 j" g' b9 E7 u5 \<i>clamp NMOS's ability.- B' ~+ V, Q x) Z! W ~. |
<ii>clamp NMOS's turn-on rate./ J7 Q9 G0 M/ t. {" l! a+ Q. w( p% u
<iii>Not follow design rule.......................
4 g% D! _- @% y6 k8 q2 MAs we know ,RC-control is to keep clamp NMOS off when IC is on normal operation.(us)3 g/ j' J( q/ W; b' f
When sufferred ESD pulse(ns),GGNMOS be turned on by coupling .
8 }! R' ] [! ?5 E. A. DIf adding inverter between RC and clamp NMOS,it will speed up clamp NMOS turned on.3 N6 |# s" [$ \5 ^# \
Just for reference !!! |
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發表於 2010-5-10 14:38:41
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