Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Programmable pull-up resistor in Cyclone II

Dear Sir, I've a question about the pull-up resistor. Suppose, the pull-up resistor is related to the I/O voltage Vccio and current strength, isn't it? Why does it show the resistor is a...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

In the device handbook, the minimum value for an external pull-up resistor is calculated. The internal pull-up resistor is in contrast a weak pull-up with a resistance several orders of magnitude above this minimum value.