The DS1225Y 64K Nonvolatile SRAM is a 65,536bit, fully static, nonvolatile RAM organized as 8192 words by 8 bits. Each NV SRAM has a selfcontained lithium energy source and control circuitry which constantly monitors VCC for an outoftolerance condition. When such a condition occurs, the lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent data corruption. The NV SRAM can be used in place of existing 8K x 8 SRAMs