=== Formula ===
* voltage seens by the input of uC '''VDD_low''' when it's a low state '''VDD_low''' :
<math>
VDD_{low} = VDD \cdot 0.2 = 3.3 \cdot 0.2
</math>
= ''' 0.66 V'''
* Resitor seens by the input of uC when it's a low state '''RIN_low''' :
<math>
RIN_{low} = \frac{VDD_{low}}{I_L} = \frac{0.66}{2u}
</math>
= ''' 330 kohms'''
* Resitor Pull-Up MAX :
<math>
RIN_{low} = \frac{VDD - VDD_{low}}{I_L} = \frac{3.3 - 0.66}{2u}
</math>
= ''' 1.32 Mohms'''
= Layout =