Forum Discussion

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

CPLD Weak pull-up resistors during power-up

All, There is mention in the MAX II device handbook of Weak pull-up resistors during power-up of the device. What I cannot find is the value of these weak pull-ups, does anyone know what the...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

5–4 Chapter 5: DC and Switching Characteristics

Operating Conditions

MAX II Device Handbook © August 2009 Altera Corporation

IPULLUP I/O pin pull-up resistor

current when I/O is

unprogrammed

— — — 300 μA

So you can drain 300uA max I think before pull-up operation may fail.