Programmable controller capacitor and battery backed ram memory

Details Programmable controller capacitor and battery backed ram memory Programmable controller capacitor and battery backed ram memory

1988-03-04

1989-10-17

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 66, 365228, 365229, H02J 902, G11C 1134

Patent

active

048749605

ABSTRACT:
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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