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Per my experience ,Diodes + RC-Control , inverter and PowerClamp is better for out pad0 p; I! |0 {3 B! Q, c- q6 a
Generally speaking ,the root cause of ESD failed is from below.
/ G% r# |, Y6 h4 _; w9 g6 {. X; T; @<i>clamp NMOS's ability.
+ N2 _6 F3 G& b9 F<ii>clamp NMOS's turn-on rate.) ?9 r3 R. n- o$ x
<iii>Not follow design rule.......................
& E0 R* f6 t! g! Q+ o. IAs we know ,RC-control is to keep clamp NMOS off when IC is on normal operation.(us)) B7 }9 p! Y% w: k7 w7 y, r! }
When sufferred ESD pulse(ns),GGNMOS be turned on by coupling .& D+ ~! F" }. w: P. K
If adding inverter between RC and clamp NMOS,it will speed up clamp NMOS turned on.
6 t" e$ E& _2 s) IJust for reference !!! |
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發表於 2010-5-10 14:38:41
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