The DS1330W 3.3V 256K Nonvolatile SRAM is a 262,144bit, fully static, nonvolatile SRAM organized as 32,768 words by eight 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