Square D Company

Jeffrey J Cybela

Jerome J Reichard

A switching network on a volatile memory circuit card assembly includes a back-up battery power supply to supply power to the volatile memory components upon failure of a line source of electrical power. A high capacitance capacitor acts as a power source to supply power to the memory components upon failure of the line source of power and before tha back-up battery power supply acts. This substantially increases the life of the battery. The switching network also provides a switch normally conducting the line source electrical power to the memory components and that isolates the memory components from the line source electrical power supply upon a failure. Switches also isolate a WRITE signal form the memory components and produce a PROTECT signal with a hysteresis effect. A second battery located off the card assembly can act to supply power before the first battery on the card assembly.

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Glendale, WI, United States of America

Jeffrey J Cybela