Maxim > Products > Memory > DS1225AB, DS1225AD

DS1225AB, DS1225AD

64k Nonvolatile SRAM

Overview

Technical Documents

Ordering Info

Status

Part Number	Status
DS1225AB	Active: In Production. See Ordering Information for details.
DS1225AD	Active: In Production. See Ordering Information for details.

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 V_CC 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.

Data Sheet

Download	Rev 4	(PDF, 212kB)
E-Mail

This product contains lithium-metal batteries. See applicable regulations for transport requirements for batteries in equipment.

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 of 70ns
Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time
Full ±10% V_CC operating range (DS1225AD)
Optional ±5% V_CC 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 w/Int. Batt.

Pwr. Cap Pckg.

Battery Monitor

GPIO

V_SUPPLY
(V)

Budgetary Price

min

max

See Notes

DS1225AB

NV SRAM

8K x 8

Parallel

Yes

4.75

5.25

$8.25 @1k

DS1225AD

4.5

5.5

$7.65 @1k

See All Memory (EPROM, EEPROM, ROM, NV SRAM) (58)

Pricing 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.

Diagram

Pin Assignment

Application Notes

Application Note 202		NV SRAM Frequently Asked Questions
Application Note 1066		Tech. Brief 39: NV SRAM Cross Reference Table
Application Note 3759		Timing Considerations When Using NVSRAM
Application Note 4006		NVSRAM Device Programmers
Application Note 4289		Low-Temperature Data Retention in Nonvolatile SRAM
Application Note 4392		How to Replace a DS1213 SmartSocket with an Equivalent-Density NV SRAM Module
Application Note 4893		Substitution Rules for Nonvolatile Memory Components
Application Note 5013		Lithium Battery Content in Maxim Products

Reliability Reports

Request Reliability Report for:
Underwriters Laboratories (UL) Recognized

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Notes	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1225AB-150	10% Tolerance, 150ns		N/A	No Longer Available	DS1225AB-70+	EDIP;28 pin;629.9 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		N/A	No Longer Available	DS1225AB-70IND+	EDIP;28 pin;629.9 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-150IND+				Active		EDIP;28 pin;629.9 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-170	5% Tolerance, 170ns		N/A	No Longer Available	DS1225AB-70+	EDIP;28 pin;629.9 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+				Active	DS1225AB-150+	EDIP;28 pin;629.9 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-200	5% Tolerance, 200ns		N/A	No Longer Available	DS1225AB-70+	EDIP;28 pin;629.9 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+				Active		EDIP;28 pin;629.9 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	5% Tolerance, 200ns		N/A	No Longer Available	DS1225AB-70IND+	EDIP;28 pin;629.9 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+				Active		EDIP;28 pin;629.9 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-70	5% Tolerance, 70ns		N/A	No Longer Available	DS1225AB-70+	EDIP;28 pin;629.9 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
Part Number	Notes	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1225AB-70+				Active		EDIP;28 pin;629.9 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-70IND	5% Tolerance, 70ns		N/A	No Longer Available	DS1225AB-70IND+	EDIP;28 pin;629.9 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+				Active		EDIP;28 pin;629.9 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-85	5% Tolerance, 85ns		N/A	No Longer Available	DS1225AB-70+	EDIP;28 pin;629.9 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+				Active		EDIP;28 pin;629.9 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		N/A	No Longer Available	DS1225AD-70+	EDIP;28 pin;629.9 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-150+				Active		EDIP;28 pin;629.9 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-150IND	10% Tolerance, 150ns		N/A	No Longer Available	DS1225AD-70IND+	EDIP;28 pin;629.9 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-170	10% Tolerance, 170ns		N/A	No Longer Available	DS1225AD-70+	EDIP;28 pin;629.9 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+				Active	DS1225AD-150+	EDIP;28 pin;629.9 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
Part Number	Notes	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1225AD-200	10% Tolerance, 200ns		N/A	No Longer Available	DS1225AD-70+	EDIP;28 pin;629.9 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+				Active		EDIP;28 pin;629.9 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	10% Tolerance, 200ns		N/A	No Longer Available	DS1225AD-70IND+	EDIP;28 pin;629.9 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+				Active		EDIP;28 pin;629.9 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-70	10% Tolerance, 70ns		N/A	No Longer Available	DS1225AD-70+	EDIP;28 pin;629.9 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+				Active		EDIP;28 pin;629.9 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-70IND	10% Tolerance, 70ns		N/A	No Longer Available	DS1225AD-70IND+	EDIP;28 pin;629.9 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+				Active		EDIP;28 pin;629.9 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-85	10% Tolerance, 85ns		N/A	No Longer Available	DS1225AD-70+	EDIP;28 pin;629.9 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+				Active		EDIP;28 pin;629.9 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

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* 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.

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-5625 Rev 4; 2010-11-09
This page last modified: 2010-11-15