Input protection structure for integrated circuits
US5187562A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 30, 1990 |
| Grant date | Feb 16, 1993 |
| Priority date | — |
| Expiry date | Oct 30, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D89/60
Abstract
An input protection structure for integrated circuits to be connected between an input and a reference potential includes a resistor. At least one transistor has a collector connected to the input, a base connected through the resistor to the reference potential, and an emitter connected to the reference potential. A semiconductor substrate has a first conduction type. The collector is in the form of a buried collector of a second conduction type in the semiconductor substrate. The base is in the form of at least one doped zone of the first conduction type having a base connection. The emitter is in the form of a doped zone of the second conduction type having an emitter connection. The resistor is in the form of at least one further doped zone of the first conduction type being connected to the emitter exclusively through the emitter connection and being connected to the base exclusively through the base connection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.