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Per my experience ,Diodes + RC-Control , inverter and PowerClamp is better for out pad
1 y$ ]) X. c0 A' \3 iGenerally speaking ,the root cause of ESD failed is from below.' g4 g5 l8 U3 x
<i>clamp NMOS's ability.
. m6 N5 m' f; D" o<ii>clamp NMOS's turn-on rate.
. u' N+ n, f H- M+ k<iii>Not follow design rule.......................2 h k; {# ~1 o2 U! p- U: I0 {
As we know ,RC-control is to keep clamp NMOS off when IC is on normal operation.(us)
, v. n. N5 H0 P* E) @When sufferred ESD pulse(ns),GGNMOS be turned on by coupling .2 m( D3 M" _6 r; N; z; m, A
If adding inverter between RC and clamp NMOS,it will speed up clamp NMOS turned on.
6 i% | w9 m5 `: C( l( `Just for reference !!! |
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發表於 2010-5-10 14:38:41
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