Patent ID: 9620211
Date: 2017-04-11
CPC Classifications: G11C,H01L

Claim:
1. A maintaining device for maintaining the normal operation of a resistive random access memory, wherein the resistive random access memory comprises a first electrode and a second electrode, wherein the first electrode is not grounded, wherein the maintaining device is adapted to output an operational signal and a restoring signal to the first electrode of the resistive random access memory, wherein the maintaining device comprises: a signal generation module; a calculation module coupled with the signal generation module, wherein the calculation module controls the signal generation module to generate the operational signal based on a command, and controls the operational signal to transit from a zero voltage to a non-zero voltage and then back to the zero voltage during a period of operational time, wherein the calculation module determines whether the operational signal has already transited from the non-zero voltage back to the zero voltage, wherein, if the determined result is positive, the calculation module controls the signal generation module to generate the restoring signal based on a restoring command, controls the restoring signal to transit from the zero voltage to a negative voltage, controls the restoring signal to remain the negative voltage for a period of restoring time, and then controls the restoring signal to transit from the negative voltage back to the zero voltage, wherein, if the determined result is negative, the calculation module keeps monitoring a voltage level of the operational signal.