NonVolatile Memory

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Non-Volatile Memory
Tech Topic Presentation

• Jeremy Searle
• Feb. 4th, 2004

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Definition

• A storage device whose contents are preserved
  when the system power is turned off.
• Examples Magnetic disks, magnetic tape, paper
  tape, punch cards, CD-ROMs, EEPROM, SRAM with
  batteries,

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Report Focus

• -Applicable to micro-controllers
• -Single chip (28 pin DIP)
• -Current technology
• -Three types NV-SRAM, EEPROM, Flash EEPROM

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Battery Backed SRAM (NVSRAM)

• What is it Static RAM that has a battery
  connected to it in order to keep the SRAM
  contents when system power is off
• Uses Constantly changing/updating data that must
  be recorded
• Common Uses Control system data acquisition
  cards/Computer cards, HP calculator memory, older
  video game cartridges

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Battery Backed RAM
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EEPROM
(Electrically Erasable Programmable Read Only
Memory)

• What is it Read Only Memory that requires
  absolutely no power to save data. Similar to
  EPROM except it can be programmed electrically,
  without removal/UV exposure
• Uses Storing small amounts of data which is NOT
  frequently changed
• Common Uses voice recognition phone dialers,
  lighting controllers/mixers, newer video game
  cartridges

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EEPROM
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Flash Memory

• What is it A type of EEPROM that erases a block
  of data or the chips entire contents at one
  time, resulting in faster writing times
• Uses Storing small amounts of data which is NOT
  frequently changed
• Common Uses Memory sticks for digital cameras,
  portable USB drives, 68HC08 memory

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Flash Memory
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Relative Speed/Prices
Note All prices are for 256 KB, 28 pin DIP,
Parallel interface
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Sources

• http//www.gamespy.com/articles/july03/25smartest/
  index9.shtml
• http//www.logistica.com.au/product.cfm/ProductID/
  DCE935CB-6C0E-48F2-8E76-34DE339534E2
• http//www.st.com/stonline/products/families/memor
  ies/nvram/nv_zp_wi.htm
• http//www.sbs.com/products/467
• http//www.umem.com/MM-5415CN.html
• http//computer.howstuffworks.com/ram4.htm
• http//www.hyperdictionary.com/dictionary/non-vola
  tilestorage
• http//hardwarecentral.dealtime.com/xDN-Musical_In
  struments-EEPROMCR-010DW-0
• http//store.yahoo.com/safemart/noname8.html
• http//computer.howstuffworks.com/flash-memory.htm
  
• http//www.digikey.com
• http//www.tigerdirect.com

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Questions?