Patent ID: 6385114
Filing Date: 2002-05-07
Classification: G11C

Abstract:
A memory system, comprising:a first power supply for supplying a first power supply line with electric power, the first power supply having terminals; a first diode connected to one of the terminals of the first power supply, the first diode being connected to the first power supply line; a second power supply for supplying a second power supply line with electric power, the second power supply having terminals; a second diode connected to one of the terminals of the second power supply, the second diode being connected to the second power supply line; a memory requiring battery backup; and a switch to connect the second power supply line to said memory; wherein, the first power supply line and the second power supply line are connected, respectively, by way of a connector that is mounted in a memory package for said memory, and the first power supply line is further connected by way of a third diode, the connector and a surge suppression element, wherein the memory package is mounted with storage elements for battery backup, and wherein said switch functions: to maintain an off state during insertion or removal of said memory package when the first power supply from said connector is off, to turn on state at a first time constant during insertion of said package when the first power supply is on, to turn off at a second time constant during removal of said package when the first power supply is on, and to maintain the on state, when the first power supply switches from on to off with said package still inserted.