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Part Number	Status	Replacement	Explanation
DS1225Y	This product is Not Recommended for New Designs. See Ordering Information for recommended replacements.	DS1225AD	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.

Data Sheet

FULL DATA SHEET (PDF, 176kB) Download   E-Mail

Description

The DS1225Y 64K Nonvolatile SRAM is a 65,536-bit, fully static, nonvolatile RAM 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 SRAM can be used in place of existing 8k x 8 SRAMs directly conforming to the popular bytewide 28-pin DIP standard. The DS1225Y also matches the pinout of the 2764 EPROM or 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.

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 2k 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 150ns 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 - DS1225Y

Reliability Reports

Request Reliability Report for: DS1225Y Underwriters Laboratories (UL®) Recognized

Software/Models

none

Ordering Information

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. More: SeeFull Data Sheet or Part 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.

Devices: 1-10 of 10

DS1225Y	Notes	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1225Y-170			N/A	NRND	DS1225AD	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS1225Y-170+			N/A	NRND	DS1225AD	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS1225Y-200+			N/A	NRND	DS1225AD	Land Pattern: Not Available	0°C to +70°C	See data sheet
DS1225Y-150IND+				NRND	DS1225AD	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
DS1225Y-200IND			N/A	NRND	DS1225AD	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1225Y-200IND+			N/A	NRND	DS1225AD	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1225Y-150	10% Tolerance, 150ns			NRND	DS1225AD	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
DS1225Y-200	10% Tolerance, 200ns			NRND	DS1225AD	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
DS1225Y-150+				NRND	DS1225AD	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
DS1225Y-150IND	10% Tolerance, 150ns			NRND	DS1225AD	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

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