DS2227-100

更新时间： 2024-10-28 22:35:23

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DS2227-100 数据手册

DS2227

Flexible NV SRAM Stik

www.dalsemi.com

FEATURES

ꢀ Flexibly organized as 128k x 32, 256k x 16,

or 512k x 8 bits

PIN ASSIGNMENT

ꢀ Data retention >10 years in the absence of

V_CC

ꢀ Nonvolatile circuitry transparent to and

independent from host system

ꢀ Automatic write protection circuitry

safeguards 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-position

SIMM connection scheme

ꢀ Lithium energy source is electrically

disconnected to retain freshness until power is

applied for the first time

72-Pin SIP STIK

DESCRIPTION

The DS2227 Flexible NV SRAM Stik is a self-contained 4,194,304-bit nonvolatile static RAM which can

be flexibly organized as 128k x 32 bits, 256k x 16 bits, or 512k x 8 bits. The nonvolatile memory contains

all necessary control circuitry and lithium energy sources to maintain data integrity in the absence of

power for more than 10 years. The DS2227 employs the popular JEDEC standard 72-position SIMM

connection scheme requiring no additional circuitry.

OPERATION

The DS2227 Flexible NV SRAM Stik is used like any standard static RAM. All nonvolatile circuitry is

transparent to the user. The flexibility of the part is achieved by providing separate read, write, and chip

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