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Maxim > Products > [Memories: Volatile, NV, Multi-Function] 
DS1225AB, DS1225AD
64k Nonvolatile SRAM


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Data Sheet
FULL DATA SHEET (PDF, 184kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The DS1225AB and DS1225AD are 65,536-bit, fully static, nonvolatile (NV) SRAMs organized as 8192 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 SRAMs can be used in place of existing 8k x 8 SRAMs directly conforming to the popular bytewide 28-pin DIP standard. The devices also match the pinout of the 2764 EPROM and the 2864 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 8k x 8 volatile static RAM or EEPROM
  • Unlimited write cycles
  • Low-power CMOS
  • JEDEC standard 28-pin DIP package
  • Read and write access times as fast as 70ns
  • Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time
  • Full ±10% VCC operating range (DS1225AD)
  • Optional ±5% VCC operating range (DS1225AB)
  • Optional industrial temperature range of -40°C to +85°C, designated IND
  • Underwriters Laboratories (UL®) Recognized

Key Specifications:   Memory (EPROM, EEPROM, ROM, NV SRAM)
Part Number Memory Type Memory Size Bus Type Real-Time Clock DIP with Internal Battery PowerCap Package Battery Monitor With GPIO Supply Voltage (min) (V) Supply Voltage (max) (V) Price**
DS1225AB  NV SRAM 8K x 8 Parallel No Yes No No No 4.75 5.25 $8.05 @ 1k
DS1225AD  4.5 5.5 $7.65 @ 1k
See All Memory (EPROM, EEPROM, ROM, NV SRAM) (54)
Notes:
**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Application Notes
  		• Application Note 202: NV SRAM Frequently Asked Questions - DS1225AB, DS1225AD
  		• Application Note 1066: Tech. Brief 39: NV SRAM Cross Reference Table - DS1225AB, DS1225AD
  		• Application Note 3759: Timing Considerations When Using NVSRAM - DS1225AB, DS1225AD
  		• Application Note 4006: NVSRAM Device Programmers - DS1225AB, DS1225AD
  		• Application Note 4289: Low-Temperature Data Retention in Nonvolatile SRAM - DS1225AB, DS1225AD
  		• Application Note 4392: How to Replace a DS1213 SmartSocket with an Equivalent-Density NV SRAM Module - DS1225AB

    Evaluation Kits
    none

    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: 1-30 of 30

    DS1225AB Notes Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1225AB-170+  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1225AB-70+  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1225AB-200IND+  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1225AB-150IND+  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1225AB-70IND+  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1225AB-200+  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1225AB-85+  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1225AB-150   10% Tolerance, 150ns  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1225AB-170   5% Tolerance, 170ns  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1225AB-200   5% Tolerance, 200ns  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1225AB-70   5% Tolerance, 70ns  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1225AB-85   5% Tolerance, 85ns  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1225AB-150IND   10% Tolerance, 150ns  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1225AB-200IND   5% Tolerance, 200ns  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1225AB-70IND   5% Tolerance, 70ns  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1225AD Notes Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1225AD-70+  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1225AD-170+  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1225AD-200IND+  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1225AD-70IND+  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1225AD-200+  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1225AD-150+  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1225AD-85+  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1225AD-150   10% Tolerance, 150ns  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1225AD-170   10% Tolerance, 170ns  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1225AD-200   10% Tolerance, 200ns  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1225AD-70   10% Tolerance, 70ns  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1225AD-85   10% Tolerance, 85ns  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1225AD-150IND   10% Tolerance, 150ns  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1225AD-200IND   10% Tolerance, 200ns  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1225AD-70IND   10% Tolerance, 70ns  
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT28-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis

    More Information
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    2007-12-20
    This page last modified: 2009-06-04


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