CIRCUIT FOR PROTECTING ELECTROSTATIC DISCHARGE

摘要

PURPOSE: An ESD(electrostatic discharge) protection circuit is provided to improve tolerance of ESD when ESD pin-to-pin test by connecting Vccq of pull-up device to Vcc of input pin. CONSTITUTION: A fail of ESD protection circuit is generated in Vssq. The circuit comprises DQ pins(11,13) having a pull-up device connected to Vccq and a pull-down device connected to Vssq, and input pins(15,17) having a pull-up device connected to Vccq and a pull-down device connected to Vss. The quantity of current to pass the Vssq is decreased since the Vccq is connected to the Vcc.