I want to ask about the difference between the following when I was reading through a datasheet:

Input high current (pull-up) - Min: /; Max: 20uA
Input high current (pull-down) - Min: /; Max: 500uA
Input low current (pull-down) - Min: -20uA; Max: /
Input low current (pull-up) - Min: -500uA; Max:/

Can someone tell explain the difference between all fours above?.

If the target input high voltage is between 1.7-3.2V, and the voltage source is 3.3V, do I calculate the pull-up resistor value base on the Input high current (pull-up)?

  • \$\begingroup\$ Which datasheet is that from? \$\endgroup\$ – eeintech Feb 11 at 12:07

The datasheets shows that if you use input high current (Pull-up) you can get a max current of 20uA and min of -20uA and the same for the three others I hope that wil help

| improve this answer | |
  • \$\begingroup\$ In that case, if I have a 3.3V supply, do I calculate like this: 1.7V < 3.3V - 20uA * R(Pull-up) < 3.2V \$\endgroup\$ – Allen W Jul 11 '17 at 20:02

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.