Voltage detecting circuit
US4922133A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1988 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Jul 29, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A voltage detecting circuit comprising a voltage-input terminal for receiving a first voltage or a second voltage higher than the first voltage, switch means connected between the voltage-input terminal and a first node, and an inverter circuit having an input terminal coupled to the first node and an output terminal coupled to a second node. The switch circuit is turned on when the voltage at the voltage-input terminal is higher than a predetermined value which is between the higher than the first voltage and lower than the second voltage, and is turned off when the voltage at the voltage-input terminal is lower than the predetermined value. The inverter circuit includes a first transistor having a source-drain path coupled between a first power-source potential terminal and the second node, a current control section for maintaining a current flowing through the source-drain path of the first transistor at a predetermined value, and a second transistor having a source-drain path connected between the second node and a second power-source potential terminal and a gate coupled to the first node.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.