DS2227

Flexible NV SRAM Stik

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Overview

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
Access times: 70ns, 100ns, or 120ns
Unlimited write cycles
Equal read/write cycle times
JEDEC-standard 72-position SIMM connection
Lithium source with freshness seal
Operating ranges:
- 5V±10% tolerance
- 0°C to 70°C

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.