DS1258Y

www.DataSheet4U.com DS1258Y/AB 128k x 16 Nonvolatile SRAM www.maxim-ic.com 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 ChipSelect 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 -40°C to +85°C, Designated IND PIN ASSIGNMENT CEU CEL DQ15 DQ14 DQ13 DQ12 DQ11 DQ10 DQ9 DQ8 GND DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 OE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 VCC WE A16 A15 A14 A13 A12 A11 A10 A9 GND A8 A7 A6 A5 A4 A3 A2 A1 A0 e DataShe DataSheet4U.com 40-Pin Encapsulated Package 740mil Extended PIN DESCRIPTION A0 to A16 DQ0 to DQ15 CEU CEL WE OE VCC GND - Address Inputs - Data In/Data Out - Chip Enable Upper Byte - Chip Enable Lower Byte - Write Enable - Output Enable - Power (+5V) - Ground 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 VCC for an out-of-tolerance condition. When such a condition occurs, the lithium ene...