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DS1220Y
16K Nonvolatile SRAM

Recommended Upgrades for New Designs
Part Number Replacement Explanation
DS1220Y DS1220AD

1) Write-Protection voltage (Vtp) on the DS1220Y and DS1225Y are determined by an internal voltage-divider circuit (~1.26 x VBat). As the internal battery in the module degrades, the corresponding Vtp also degrades, resulting in a change in the response of the module to system power loss. The AB/AD versions have a precision band-gap reference voltage that is independent of the battery.

2) Storage and handling of battery-backed products can be critical to achieve the expected 10 years of potential data retention from a new module. The DS1220Y and DS1225Y do not contain the Freshness Seal circuitry, which means the 10 year warranty begins with date of manufacture, as opposed to the date of customer's first use on AB/AD versions.

DS1220Y-120+ DS1220AD
DS1220Y-150+ DS1220AD
DS1220Y-200 DS1220AD
DS1220Y-200IND DS1220AD
DS1220Y-100 DS1220AD
DS1220Y-100IND DS1220AD
DS1220Y-120 DS1220AD
DS1220Y-150 DS1220AD
DS1220Y-200+ DS1220AD
DS1220Y-200IND+ DS1220AD
DS1220Y-100+ DS1220AD
DS1220Y-100IND+ DS1220AD


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Data Sheet
FULL DATA SHEET (PDF, 396kB)
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Description
The DS1220Y 16k Nonvolatile SRAM is a 16,384-bit, fully static, nonvolatile RAM organized as 2048 words by 8 bits. Each NV SRAM has a self-contained lithium energy source and control circuitry which constantly monitors VCC for an out-of-tolerance condition. When such a condition occurs, the lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent data corruption. The NV SRAM can be used in place of existing 2k x 8 SRAMs directly conforming to the popular bytewide 24-pin DIP standard. The DS1220Y also matches the pinout of the 2716 EPROM or the 2816 EEPROM, allowing direct substitution while enhancing performance. There is no limit on the number of write cycles that can be executed and no additional support circuitry is required for microprocessor interfacing.

Key Features
  • 10 years minimum data retention in the absence of external power
  • Data is automatically protected during power loss
  • Directly replaces 2k x 8 volatile static RAM or EEPROM
  • Unlimited write cycles
  • Low-power CMOS
  • JEDEC standard 24-pin DIP package
  • Read and write access times as fast as 100ns
  • Full ±10% operating range
  • Optional industrial temperature range of -40°C to +85°C, designated IND
  • Underwriters Laboratories (UL®) Recognized

Application Notes
  • Application Note 4289: Low-Temperature Data Retention in Nonvolatile SRAM - DS1220Y

    Evaluation Kits
    none

    Design Guides
  • Nonvolatile Memory (PDF)

    Reliability Reports
  • Request Reliability Report for:
  • Underwriters Laboratories (UL®) Recognized

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-6 of 6

    DS1220Y Notes Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    DS1220Y-120+  
    0 pin;

    Use pkgcode/variation: MDT24+3*
    0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1220Y-100+  
    0 pin;

    Use pkgcode/variation: MDT24+3*
    0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1220Y-100   10% Tolerance, 100ns
    0 pin;

    Use pkgcode/variation: MDT24-3*
    0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1220Y-120   10% Tolerance, 120ns
    0 pin;

    Use pkgcode/variation: MDT24-3*
    0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1220Y-200   10% Tolerance, 200ns
    0 pin;

    Use pkgcode/variation: MDT24-3*
    0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1220Y-200IND   10% Tolerance, 200ns
    0 pin;

    Use pkgcode/variation: MDT24-3*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis

    More Information
  • New Product Press Release 2001-06-19 
  • UL Certified

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    2008-07-28
    This page last modified: 2008-07-28



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