ESD protection circuit
US7719805B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 1, 2006 |
| Grant date | May 18, 2010 |
| Priority date | — |
| Expiry date | Dec 29, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D89/811
Abstract
An ESD protection circuit connected between an input pad and an internal circuit is disclosed. The ESD protection circuit includes a main ESD protection device, a first resistor and a secondary device. The main ESD protection device is connected to the input pad for clamping a voltage of the input pad. The first resistor has a first end connected to the input pad and a second end connected to the internal circuit. The secondary device is connected to the second end of the first resistor and the main ESD protection device for clamping a voltage of the internal circuit. During an ESD event, the secondary device is turned on first to receive an ESD current and accordingly provides a trigger current to turn on the main ESD protection device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.