DS2227

Features:

  Flexibly organized as 128k x 32, 256k x 16,or 512k x 8 bits
  Data retention >10 years in the absence ofV_CC
  Nonvolatile circuitry transparent to andindependent from host system
  Automatic write protection circuitrysafeguards against data loss
  Separate chip enables allow access by byte,word, or long word
  Fast access times: 70 ns, 100 ns, or 120 ns
  Unlimited write cycles
  Read cycle time equals write cycle time
 Employs popular JEDEC standard 72-positionSIMM connection scheme
  Lithium energy source is electricallydisconnected to retain freshness until power isapplied for the first time


Pinout




Specifications

Voltage on Any Pin Relative to Ground...... ... -0.3V to +7.0V
Operating Temperature ......................................0 to 70
Storage Temperature .....................................40to +85


Description

The DS2227 Flexible NV SRAM Stik is a self-contained 4,194,304-bit nonvolatile static RAM which canbe flexibly organized as 128k x 32 bits, 256k x 16 bits, or 512k x 8 bits. The nonvolatile memory containsall necessary control circuitry and lithium energy sources to maintain data integrity in the absence ofpower for more than 10 years. The DS2227 employs the popular JEDEC standard 72-position SIMMconnection scheme requiring no additional circuitry.