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Per my experience ,Diodes + RC-Control , inverter and PowerClamp is better for out pad+ c4 S8 |4 U! V. y1 \) U. P
Generally speaking ,the root cause of ESD failed is from below.
) A6 d$ @) C4 L3 P o7 x0 @<i>clamp NMOS's ability.
m7 d4 m) Q5 k& o, G: ~; A<ii>clamp NMOS's turn-on rate.3 h0 m, ^3 a! l7 u3 y! s+ V: `
<iii>Not follow design rule.......................9 X2 ] C& a/ ], v( |- R, N
As we know ,RC-control is to keep clamp NMOS off when IC is on normal operation.(us)3 w% Z1 x( j" [5 D! f+ c
When sufferred ESD pulse(ns),GGNMOS be turned on by coupling .0 w4 s6 ?" \8 W
If adding inverter between RC and clamp NMOS,it will speed up clamp NMOS turned on. x3 ]" |1 }- ?
Just for reference !!! |
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發表於 2010-5-10 14:38:41
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