I connectted the input of uc2709 to the output of a cpld. Both the uc2709 and the cpld was damaged.
I then placed a resistor of 51K between the cpld and uc2709. Uc2709 was damaged but cpld not.
i wonder if i can apply a voltage on the input of uc2709.
or I should use a open collector gate like 7406 (but without a pull up resistor) to drive it?