DS2227

Flexible NV SRAM Stik


Please check latest availability status for a specific part variant.

Description

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.
DS2227: Pin Assignment DS2227: Pin Assignment Enlarge+

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
  • 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

Technical Documents

App Note 3759 Timing Considerations When Using NVSRAM

Quality and Environmental Data

Request Reliability Report for: DS2227 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Related Resources


Belle Isle 2020
05/29/2020 - 05/31/2020, Detroit, MI
2020 Detroit Grand Prix - Chevrolet Detroit Grand Prix presented by Lear Fast Facts The Chevrolet Detroit Grand Prix presented by Lear was hosted on Belle Isle, May 29 - 30 2020. The event featured the cars of the NTT IndyCar Series, the IMSA WeatherTech SportsCar Championship and the Trans Am Series presented by Pirelli. The weekend is collectively referred to as the Chevrolet Detroit Grand Prix presented by Lear and it once again featured the Chevrolet Dual in Detroit IndyCar doubleheader.

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