Abstract: This application note discusses theory of operation and application of NV SRAMs such as the DS1220, DS1225, and DS1230. First it discusses NV RAM module construction, with an overview of the battery, controller and SRAM that is used in a typical device. Application information regarding interconnects to popular 8-bit Motorola and Intel bus structures is shown in block diagram form. Answers to common questions regarding issues found during the design, test, manufacture, and use of NV SRAMs in electronic systems is explained in detail. Information on some older and obsolete parts is discussed with recommendations on pin-for-pin replacements with more contemporary devices. The application note you have requested is available in Acrobat PDF format: APPLICATION NOTE 202: NV SRAM Frequently Asked Questions (PDF, 165kB) A free Acrobat PDF reader is available from: http://www.adobe.com/products/acrobat/readstep.html Related Parts   APP 202: May 14, 2002 DS1210 Nonvolatile Controller Chip Full Data Sheet (PDF, 144kB) Free Samples DS1220AB 16k Nonvolatile SRAM Full Data Sheet (PDF, 172kB) Free Samples DS1220AD 16k Nonvolatile SRAM Full Data Sheet (PDF, 172kB) Free Samples DS1225AB 64k Nonvolatile SRAM Full Data Sheet (PDF, 184kB) Free Samples DS1225AD 64k Nonvolatile SRAM Full Data Sheet (PDF, 184kB) Free Samples DS1230AB 256k Nonvolatile SRAM Full Data Sheet (PDF, 288kB) Free Samples DS1230W 3.3V 256k Nonvolatile SRAM Full Data Sheet (PDF, 272kB) Free Samples DS1230Y 256k Nonvolatile SRAM Full Data Sheet (PDF, 288kB) Free Samples DS1235 256k Nonvolatile SRAM   DS1245AB 1024k Nonvolatile SRAM Full Data Sheet (PDF, 284kB) DS1245W 3.3V 1024k Nonvolatile SRAM Full Data Sheet (PDF, 272kB) DS1245Y 1024k Nonvolatile SRAM Full Data Sheet (PDF, 284kB) DS1249AB 2048k Nonvolatile SRAM Full Data Sheet (PDF, 196kB) DS1249W 3.3V 2048kb Nonvolatile SRAM Full Data Sheet (PDF, 196kB) DS1249Y 2048k Nonvolatile SRAM Full Data Sheet (PDF, 196kB) DS1250AB 4096k Nonvolatile SRAM Full Data Sheet (PDF, 300kB) DS1250W 3.3V 4096k Nonvolatile SRAM Full Data Sheet (PDF, 268kB) DS1250Y 4096k Nonvolatile SRAM Full Data Sheet (PDF, 300kB) DS1258AB 128k x 16 Nonvolatile SRAM Full Data Sheet (PDF, 208kB) DS1258W 3.3V 128k x 16 Nonvolatile SRAM Full Data Sheet (PDF, 208kB) DS1258Y 128k x 16 Nonvolatile SRAM Full Data Sheet (PDF, 208kB) DS1265AB 8M Nonvolatile SRAM Full Data Sheet (PDF, 196kB) DS1265W 3.3V 8Mb Nonvolatile SRAM Full Data Sheet (PDF, 196kB) DS1265Y 8M Nonvolatile SRAM Full Data Sheet (PDF, 196kB) DS1270AB 16M Nonvolatile SRAM Full Data Sheet (PDF, 200kB) DS1270W 3.3V 16Mb Nonvolatile SRAM Full Data Sheet (PDF, 196kB) DS1270Y 16M Nonvolatile SRAM Full Data Sheet (PDF, 200kB) DS1330AB 256k Nonvolatile SRAM with Battery Monitor Full Data Sheet (PDF, 236kB) Free Samples DS1330W 3.3V 256k Nonvolatile SRAM with Battery Monitor Full Data Sheet (PDF, 236kB) Free Samples DS1330Y 256k Nonvolatile SRAM with Battery Monitor Full Data Sheet (PDF, 236kB) Free Samples DS1345AB 1024k Nonvolatile SRAM with Battery Monitor Full Data Sheet (PDF, 236kB) DS1345W 3.3V 1024k Nonvolatile SRAM with Battery Monitor Full Data Sheet (PDF, 244kB) DS1345Y 1024k Nonvolatile SRAM with Battery Monitor Full Data Sheet (PDF, 236kB) DS1350AB 4096k Nonvolatile SRAM with Battery Monitor Full Data Sheet (PDF, 244kB) DS1350W 3.3V 4096K Nonvolatile SRAM with Battery Monitor Full Data Sheet (PDF, 248kB) DS1350Y 4096k Nonvolatile SRAM with Battery Monitor Full Data Sheet (PDF, 244kB) DS2030AB Single-Piece 256Kb Nonvolatile SRAM Full Data Sheet (PDF, 224kB) DS2030L 3.3V Single-Piece 256Kb Nonvolatile SRAM Full Data Sheet (PDF, 180kB) DS2030W 3.3V Single-Piece 256kb Nonvolatile SRAM Full Data Sheet (PDF, 180kB) DS2030Y Single-Piece 256Kb Nonvolatile SRAM Full Data Sheet (PDF, 224kB) DS2045AB Single-Piece 1Mb Nonvolatile SRAM Full Data Sheet (PDF, 224kB) DS2045L 3.3V Single-Piece 1Mb Nonvolatile SRAM Full Data Sheet (PDF, 180kB) DS2045W 3.3V Single-Piece 1Mb Nonvolatile SRAM Full Data Sheet (PDF, 180kB) DS2045Y Single-Piece 1Mb Nonvolatile SRAM Full Data Sheet (PDF, 224kB) DS2050W 3.3V Single-Piece 4Mb Nonvolatile SRAM Full Data Sheet (PDF, 228kB) DS2065W 3.3V Single-Piece 8Mb Nonvolatile SRAM Full Data Sheet (PDF, 224kB) DS2070W 3.3V Single-Piece 16Mb Nonvolatile SRAM Full Data Sheet (PDF, 300kB) DS3030W 3.3V Single-Piece 256kb Nonvolatile SRAM with Clock Full Data Sheet (PDF, 284kB) DS3045W 3.3V Single-Piece 1Mb Nonvolatile SRAM with Clock Full Data Sheet (PDF, 284kB) DS3050W 3.3V Single-Piece 4Mb Nonvolatile SRAM with Clock Full Data Sheet (PDF, 284kB) DS3065W 3.3V Single-Piece 8Mb Nonvolatile SRAM with Clock Full Data Sheet (PDF, 284kB) DS3070W 3.3V Single-Piece 16Mb Nonvolatile SRAM with clock Full Data Sheet (PDF, 284kB) Automatic Updates Would you like to be automatically notified when new application notes are published in your areas of interest? Sign up for EE-Mail™. We Want Your Feedback!   Download, PDF Format (165kB)  AN202, AN 202, APP202, Appnote202, Appnote 202