Capacitor-couple electrostatic discharge protection circuit
US5631793A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 1995 |
| Grant date | May 20, 1997 |
| Priority date | — |
| Expiry date | Sep 5, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D89/601
Abstract
The present invention is related to a capacitor-couple electrostatic discharge (ESD) protection circuit for protecting an internal circuit and/or an output buffer of an IC from being damaged by an ESD current. The capacitor-couple ESD protection circuit according to the present invention includes an ESD bypass device for bypassing the ESD current, a capacitor-couple circuit for coupling a portion of voltage to the ESD bypass device, and a potential leveling device for keeping an ESD voltage transmitted for the internal circuit at a low potential level. By using the present ESD protection circuit, the snapback breakdown voltage can be lowered to protect the very thin gate oxide of the internal circuit especially in the submicron CMOS technologies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.