The DS2227 combines voltage monitoring circuitry with lithium-backed memory in a flexible architecture that can be accessed as 128k x 32, 256k x 16, or 512k x 8 bits.
Using precise comparators, the DS2227 monitors incoming Vcc for an out-or-tolerance condition. When such a condition occurs, the internal lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent data corruption.
While the DS2227 is used like a standard static RAM, it can be flexibly configured by virtue of separate read, write, and chip-select bits for each of the four memory banks.
Dallas' nonvolatile memory chips are known throughout the industry for low-power consumption. They render data nonvolatile for greater than 10 years in the absence of power, greater than the useful like of the associated equipment.
Key Features
Memory with flexible architecture:
128k x 32
256k x 16
512k x 8
NV circuitry transparent to/independent of host
Automatic write protection circuitry
Separate chip-enables for access by byte, word, or long word
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