Volatile memory support system
First Claim
1. A volitile memory support system for use with a volitile memory requiring a maintenance voltage to retain its bistable state and an operating voltage to permit it to alter its bistable state, said support system comprising:
- a primary power supply capable of providing system-operating voltages including said operating voltage coupled to said volitile memory;
a secondary power supply capable of providing said maintenance voltage;
a battery supply capable of providing said memory maintenance voltage; and
switching means coupled to said secondary power supply, said battery supply and said memory to provide said memory with said maintenance voltage when said operating voltages are not being applied to said memory.
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Accused Products
Abstract
An automatic support system for a volatile memory which provides maintenance voltages to such memory upon the interruption of normal operating voltages and which permits the intentional termination of operating voltages with the provision of maintenance voltages. The main power inputs for the memory are applied simultaneously to a primary power supply and secondary supply, the secondary supply providing the required memory maintenance voltages. In addition a battery supply is provided as backup for main power failure. A voltage regulator controlled by an electronic power switch is operative to provide the necessary maintenance voltage to the memory making use of the available supplies in a preferential order of primary, secondary power supply and battery supply.
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Citations
6 Claims
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1. A volitile memory support system for use with a volitile memory requiring a maintenance voltage to retain its bistable state and an operating voltage to permit it to alter its bistable state, said support system comprising:
- a primary power supply capable of providing system-operating voltages including said operating voltage coupled to said volitile memory;
a secondary power supply capable of providing said maintenance voltage;
a battery supply capable of providing said memory maintenance voltage; and
switching means coupled to said secondary power supply, said battery supply and said memory to provide said memory with said maintenance voltage when said operating voltages are not being applied to said memory. - View Dependent Claims (2, 3, 4, 5, 6)
- a primary power supply capable of providing system-operating voltages including said operating voltage coupled to said volitile memory;
Specification