Charge pump system for non-volatile ram
US4638464A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1983 |
| Grant date | Jan 20, 1987 |
| Priority date | — |
| Expiry date | Nov 14, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C14/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A voltage generating system provides a plurality of different voltages for powering a dynamic nonvolatile random access memory (NVRAM) chip. The voltage generating system includes a pair of charge pumps. Each charge pump is coupled to a controller that senses the voltage level at the output of the charge pump and generates an enabling signal when said voltage is at a predetermined value. The signal activates a power down circuit which adjusts the charge pump output to a desired voltage level. A programmable oscillator provides the clocking signals for the controller. The charge pumps and programmable oscillators are periodically deactivated. As a result, the overall power consumption of the chip is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.