Electrostatic discharge protection circuit for protecting input and output buffer

US6639772B2 · kind B2 · utility

Assignee

• Faraday Technology Corp. · TW

Inventors

• Chien-Hui Chuang · Taipei, TW
• Kei-Kang Hung · Changhua City, TW

Key dates

• Filing date: Jan 7, 2002
• Grant date: Oct 28, 2003
• Expiry date: Apr 13, 2022

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10D89/815

Abstract

An electrostatic discharge (ESD) protection circuit for protecting input and output buffers. The ESD protection circuit is driven by a first voltage source and a second voltage source and coupled to a bonding pad. The ESD protection circuit has a first resistor, a first PMOS transistor, a first NMOS transistor, a first diode series, a second PMOS transistor, a second resistor, a third PMOS transistor, a second NMOS transistor, a second diode series and a third NMOS transistor. The electrical devices combine to form different types of ESD protection circuits, each capable of protecting the input buffer or output buffer against the damaging effects of an electrostatic discharge.