For input pins, you may put PDIO + NDIO + small resistor to protect the gate oxide , S4 `: j' m$ [ iFor output pins, you may directly use GDPMOS and GGNMOS or use the output switch (if large enough) to forward the current to power / ground for +ve and -ve ESD pulse respectively3 E0 u5 ^2 J+ x+ Q: q
8 R, H" h' i; e, \- _
any other suggestion?