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DS1245AB：1024k Nonvolatile SRAM

The DS1245 1024k Nonvolatile (NV) SRAMs are 1,048,576-bit, fully static, nonvolatile SRAMs organized as 131,072 words by 8 bits. Each complete NV SRAM has a self-contained lithium energy source and control circuitry which constantly monitors VCC for an out-of-tolerance condition. When such a condition occurs, the lithium energy source is automatically switched on and write protection is nconditionally enabled to prevent data corruption. DIP-package DS1245 devices can be used in place of existing 128k x 8 static RAMs directly conforming to the popular bytewide 32-pin DIP standard. DS1245 devices in the PowerCap Module package are directly surface mountable and are normally paired with a DS9034PC PowerCap to form a complete Nonvolatile SRAM module. There is no limit on the number of write cycles that can be executed and no additional support circuitry is required for microprocessor interfacing.

Key Features 10 years minimum data retention in the absence of external power Data is automatically protected during power loss Replaces 128k x 8 volatile static RAM, EEPROM or Flash memory Unlimited write cycles Low-power CMOS Read and write access times of 70ns Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time Full ±10% VCC operating range (DS1245Y) Optional ±5% VCC operating range (DS1245AB) Optional industrial temperature range of -40°C to +85°C, designated IND JEDEC standard 32-pin DIP package PowerCap Module (PCM) package Directly surface-mountable module Replaceable snap-on PowerCap provides lithium backup battery Standardized pinout for all nonvolatile SRAM products Detachment feature on PowerCap allows easy removal using a regular screwdriver

DS1245AB, DS1245Y: Pin Assignment

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