Patent ID: 6118303
Filing Date: 2000-09-12
Classification: H03K

Abstract:
An integrated circuit output driver comprising:first, second and third voltage supply terminals;a pad terminal;a pad pull-up transistor coupled in series between the first voltage supply terminal and the pad terminal and comprising a pull-up control terminal;a pad pull-down transistor coupled in series between the second voltage supply terminal and the pad terminal and comprising a pull-down control terminal;a first voltage protection transistor coupled in series between the pad terminal and the pad pull-down transistor and comprising a first control terminal and a capacitance between the first control terminal and the pad terminal; anda resistor coupled in series between the first control terminal and the third voltage supply terminal and forming a resistor-capacitor (RC) circuit with the capacitance, which has a time constant of at least 50 nanoseconds, wherein the resistor has a resistance of 5K Ohms to 100K Ohms.