Semiconductor integrated circuit device with internal voltage controlling circuit
US5352935A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1992 |
| Grant date | Oct 4, 1994 |
| Priority date | — |
| Expiry date | Oct 1, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/465
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A semiconductor integrated circuit device has a first internal voltage controlling circuit which lowers an external power source voltage and produces a predetermined internal power source voltage. The device further has a second internal voltage controlling circuit formed by an internal-voltage drop detection circuit for detecting the lowering of the internal power source voltage from a predetermined reference voltage and a switching circuit for causing the external power source voltage to be directly connected to an internal voltage output terminal based on an output from the internal-voltage drop detection circuit. The internal power source voltage is maintained close to the required value thereby preventing a deterioration of circuit performance even when the external power source voltage drops close to the internal power source voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.