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Per my experience ,Diodes + RC-Control , inverter and PowerClamp is better for out pad
4 U( v& T" P9 H3 xGenerally speaking ,the root cause of ESD failed is from below. C/ F4 {2 K2 o4 P! q! V
<i>clamp NMOS's ability.
7 d0 c. V2 x% w5 U* e/ L<ii>clamp NMOS's turn-on rate.
% L! r1 f/ H! t: \# X9 k4 |<iii>Not follow design rule....................... @5 ?. `8 B! ]% [4 R2 A
As we know ,RC-control is to keep clamp NMOS off when IC is on normal operation.(us)7 W0 L4 q0 p0 o5 _; C1 R3 X
When sufferred ESD pulse(ns),GGNMOS be turned on by coupling .* O9 I N. s6 G6 ~- @) x" @" |
If adding inverter between RC and clamp NMOS,it will speed up clamp NMOS turned on.
# r! X3 l4 T) I: |Just for reference !!! |
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發表於 2010-5-10 14:38:41
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