OUTPUT BUFFER CIRCUIT FOR ELECTROSTATIC DISCHARGE PROTECTION IN SEMICONDUCTOR DEVICE

摘要

PURPOSE: An output buffer circuit for electrostatic discharge protection in a semiconductor device is provided to prevent a damage of a semiconductor device due to electrostatic discharge by forming an anti-electrostatic circuit. CONSTITUTION: An output buffer(10) is formed with drive transistors connected with internal signals. An anti-electrostatic circuit(20) is formed with anti-electrostatic transistors. The output buffer(10) and the anti-electrostatic circuit(20) are formed with transistors of different types, respectively. The output buffer(10) has a pull-up transistor and a pull-down transistor connected between the first supply voltage and the second supply voltage. The anti-electrostatic transistors of the anti-electrostatic circuit(20) has a breakdown voltage lower than the breakdown voltage of the transistors of the output buffer.