Electrostatic discharge protection device for pad and method and structure thereof
US7911749B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 27, 2007 |
| Grant date | Mar 22, 2011 |
| Priority date | — |
| Expiry date | Dec 7, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D89/713
Abstract
An ESD protection device for a pad includes an adjusting circuit, a snapback element and a control circuit. The adjusting circuit includes a silicon controlled rectifier (SCR) coupled to the pad. The SCR includes a first diode. The snapback element is coupled to a first N pole of the first diode when a second diode is not used, and is coupled to a second N pole of the second diode when the second diode is used. The control circuit is coupled to the first N pole. In a normal operation mode, the control circuit provides a first voltage to the first N pole so that the first N pole collects a plurality of charges and the SCR is turned off. In an ESD mode, the control circuit does not provide the first voltage to the first N pole so that the first N pole does not collect the charges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.