Identity circuit for an integrated circuit using a fuse and transistor enabled by a power-on reset signal
US4716302A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1986 |
| Grant date | Dec 29, 1987 |
| Priority date | — |
| Expiry date | Dec 22, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2223/5444
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An integrated circuit has an identifying circuit coupled to an input. The input has ESD protection. The identifying circuit has a fuse which is in one of two possible states to provide the identifying information. A power on reset circuit provides a pulse in response to application of power to the integrated circuit. A current path between a power supply terminal and the input is provided in response to the power on reset pulse when the fuse is in one state. This current path is blocked when the fuse is in the other state. A user is thus provided with identifying information by the presence or absence of a current path at the input at the time when power is applied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.