ESD circuit for input which exceeds power supplies in normal operation
US5032742A · kind A · utility
31Cited by
15References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 28, 1989 |
| Grant date | Jul 16, 1991 |
| Priority date | — |
| Expiry date | Jul 28, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0292
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An integrated circuit which, for ESD protection at an input pad, uses a split series resistor, with two clamping diodes of different types. By splitting up the series resistance in this fashion, some impedance is provided before the first hard diode, without causing an excessive total impedance. When a positive-going transient appears at the pad, the current is limited only by a moderate impedance (which saves area); when a negative-going transient appears, the current is limited by a much higher impedance (which allows a lower leakage current to be achieved).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.