DESCRIPTION

The DS1258 128k x 16 nonvolatile (NV) SRAMs are 2,097,152-bit fully static, NV SRAMs, organized as 131,072 words by 16 bits. Each NV SRAM has a self-contained lithium energy source and control circuitry that constantly monitors VCCfor an out-of-tolerance condition. When such a condition occurs, the lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent data corruption.

FEATURES


10-Year Minimum Data Retention in the Absence of External Power


Data is Automatically Protected During a Power Loss


Separate Upper Byte and Lower Byte Chip Select Inputs


Unlimited Write Cycles


Low-Power CMOS


Read and Write Access Times as Fast as 70ns


Lithium Energy Source is Electrically Disconnected to Retain Freshness Until Power is Applied for the First Time


Full
10% Operating Range (DS1258Y)


Optional
5% Operating Range (DS1258AB)


Optional Industrial Temperature Range of -40C to +85C, Designated IND