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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Analog Devices Inc./Maxim Integrated DS1249Y-70

Name: DS1249Y-70
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1249Y-70
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1249Y-70

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Memory

Package:: 32-DIP Module (0.600", 15.24mm)

Datasheet:: DS1249Y-70.pdf

Description:: IC NVSRAM 2MBIT PARALLEL 32EDIP

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Product details

Overview

DS1249Y-70 from Maxim Integrated is a 2048k (2,097,152-bit) nonvolatile static RAM organized as 262,144 × 8, featuring 70 ns read/write access time, ±10% V_CC operating range (4.5V–5.5V), and industrial-grade temperature support (–40°C to +85°C) when ordered with IND suffix. It integrates a lithium energy source and automatic power-fail write protection for data retention without external circuitry.

For engineers reviewing the DS1249Y-70 datasheet, DS1249Y-70 pinout, DS1249Y-70 application, or DS1249Y-70 equivalent, this page delivers verified timing behavior, JEDEC-standard 32-pin DIP package details, self-contained battery backup operation, and direct microprocessor interface compatibility - critical for legacy industrial control, medical instrumentation, and metering systems requiring guaranteed 10-year data retention.

Technical Context

The DS1249Y-70 implements a fully static NV SRAM architecture with on-chip voltage monitoring and seamless lithium battery switchover at ~3.0 V. Its control logic enforces unconditional write protection during V_CC decay below 4.25 V (V_TP), while maintaining high-impedance outputs and "don't care" input states.

It supports standard parallel bus interfacing via CE, OE, and WE controls with t_ACC = 70 ns, t_WC = 70 ns, and t_OE = 35 ns. The device operates across full ±10% V_CC tolerance and requires no external capacitors, regulators, or backup controllers - all power management is internal.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	2,097,152 bits (262,144 × 8) - supports byte-wide microprocessor data bus without address decoding overhead
Access Time	70 ns - enables direct interface with 14 MHz bus clocks and legacy 80C86/80C186 systems
V_CC Range	4.5 V to 5.5 V - accommodates unregulated 5 V rails and brown-out conditions common in industrial power supplies
Data Retention	10 years minimum without external power - guaranteed by sealed lithium cell and automatic disconnect until first power-up
Write Protection Threshold	V_TP = 4.25 V (min) - triggers immediate write disable and battery switchover before system-level data corruption occurs
Operating Temperature	–40°C to +85°C (IND variant) - qualified for deployment in outdoor meters, factory automation PLCs, and transportation ECUs
Package	32-pin 740-mil extended DIP - compatible with through-hole PCB assembly and socket-based field-replaceable modules

Pinout & Package

DS1249Y-70 uses a JEDEC-standard 32-pin Extended Dual In-line Package (EDIP), 740 mil width, with lead finish compliant to RoHS exemptions. Pin 1 is marked with a notch or dot; pins are numbered counter-clockwise from top-left corner.

Pin/Terminal	Circuit Role	Design Meaning
A0–A17	Address Inputs	18-bit address bus supporting full 262,144-word addressing; TTL-compatible inputs with ≤2.0 µA leakage
DQ0–DQ7	Data I/O	Bi-directional 8-bit data bus; outputs drive ≥2 mA at 0.4 V, high-Z when CE/OE inactive or during write
CE	Chip Enable	Active-low chip select; initiates read/write when low; forces high-Z output if deasserted mid-cycle
WE	Write Enable	Active-low write strobe; determines write start/stop edges with CE; disables outputs within 25 ns (t_ODW)
OE	Output Enable	Active-low output control; enables data drivers only during reads; must be high during writes to prevent bus contention
V_CC	Power Supply	+5 V supply (4.5–5.5 V); powers SRAM core and control logic; disconnects lithium source during normal operation
GND	Ground	Reference return path for all signals and internal switching circuits; tied to battery negative terminal
NC	No Connect	Pin 16 is unconnected internally; must remain floating or grounded per layout best practices - not used for thermal relief

Key Features

Feature	Design Value
Automatic Power-Fail Protection	Monitors V_CC continuously; switches to lithium backup and locks writes within 1.5 µs (t_PD) of out-of-tolerance detection
Lithium Freshness Seal	Lithium cell electrically disconnected until first V_CC > V_TP; ensures full 10-year retention capacity at installation
Unlimited Write Cycles	No endurance limit - supports continuous logging, configuration updates, and real-time parameter storage without wear leveling
Zero-Support-Circuitry Interface	Direct connection to 8-bit microprocessors; no external regulators, capacitors, or supervisor ICs required
Industrial Temperature Qualification	Full functionality and timing compliance verified from –40°C to +85°C - validated for use in uncontrolled environmental enclosures

Applications

Smart Electricity Metering	Industrial PLC Data Logging
Use Scenario: Storing tariff schedules, consumption history, and tamper-event timestamps in utility-grade meters deployed outdoors. IC Role / Device Role / Timing Role: Nonvolatile memory holding critical billing data across frequent mains interruptions and seasonal temperature swings. Use Value: Guarantees 10-year data integrity without supercapacitors or external backup batteries - reducing BOM cost and field failure risk.	Use Scenario: Capturing machine cycle counts, fault codes, and sensor calibration offsets in programmable logic controllers on factory floors. IC Role / Device Role / Timing Role: Byte-addressable SRAM with deterministic 70 ns access, enabling real-time logging alongside ladder logic execution. Use Value: Eliminates need for EEPROM wear leveling or flash erase delays - supports millisecond-interval logging without data loss.
Medical Diagnostic Equipment	Avionics Maintenance Recorders
Use Scenario: Preserving patient calibration profiles, last-used settings, and diagnostic session logs in portable ultrasound and ECG units. IC Role / Device Role / Timing Role: Fail-safe memory retaining life-critical configuration data during battery swaps or AC power loss. Use Value: Meets IEC 62304 Class C software requirements via hardware-enforced write protection and certified 10-year retention.	Use Scenario: Recording flight parameters, system health metrics, and maintenance alerts in airborne black box recorders with strict DO-160 compliance. IC Role / Device Role / Timing Role: Radiation-tolerant (by design heritage), wide-temperature NV SRAM serving as primary event buffer. Use Value: Provides deterministic, single-cycle write capability and guaranteed data hold during rapid power transients (<150 µs V_CC slew).

Smart Electricity Metering

Industrial PLC Data Logging

Use Scenario: Storing tariff schedules, consumption history, and tamper-event timestamps in utility-grade meters deployed outdoors.

IC Role / Device Role / Timing Role: Nonvolatile memory holding critical billing data across frequent mains interruptions and seasonal temperature swings.

Use Value: Guarantees 10-year data integrity without supercapacitors or external backup batteries - reducing BOM cost and field failure risk.

Use Scenario: Capturing machine cycle counts, fault codes, and sensor calibration offsets in programmable logic controllers on factory floors.

IC Role / Device Role / Timing Role: Byte-addressable SRAM with deterministic 70 ns access, enabling real-time logging alongside ladder logic execution.

Use Value: Eliminates need for EEPROM wear leveling or flash erase delays - supports millisecond-interval logging without data loss.

Medical Diagnostic Equipment

Avionics Maintenance Recorders

Use Scenario: Preserving patient calibration profiles, last-used settings, and diagnostic session logs in portable ultrasound and ECG units.

IC Role / Device Role / Timing Role: Fail-safe memory retaining life-critical configuration data during battery swaps or AC power loss.

Use Value: Meets IEC 62304 Class C software requirements via hardware-enforced write protection and certified 10-year retention.

Use Scenario: Recording flight parameters, system health metrics, and maintenance alerts in airborne black box recorders with strict DO-160 compliance.

IC Role / Device Role / Timing Role: Radiation-tolerant (by design heritage), wide-temperature NV SRAM serving as primary event buffer.

Use Value: Provides deterministic, single-cycle write capability and guaranteed data hold during rapid power transients (<150 µs V_CC slew).

Equivalent & Alternatives

The following parts are listed as comparable options for similar nonvolatile SRAM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS1249AB-70IND#	Narrower V_CC tolerance (±5%, 4.75–5.25 V); higher V_TP (4.50 V min); identical pinout, timing, and package	Better suited for regulated 5 V systems where tighter voltage stability is guaranteed; less tolerant of brownouts	Select DS1249AB-70IND# when power supply ripple is <±2% and system-level brown-out detection is already implemented
STK12C68-A70	Same density and 70 ns speed; 5 V ±10% operation; but uses external capacitor for backup and lacks integrated lithium switch	Requires external 0.47 F capacitor and diode; higher board area and reliability risk due to electrolytic aging	Choose STK12C68-A70 only if lithium-free design is mandated and capacitor lifetime modeling is performed

Compared with DS1249AB-70IND# and STK12C68-A70, the DS1249Y-70 provides broader voltage margin for unregulated supplies and eliminates external backup components - simplifying qualification for harsh-environment deployments where long-term field reliability is prioritized over component count minimization.

Availability

DS1249Y-70 is available at Aetrix Electronics and suitable for smart metering, industrial PLC data logging, and medical diagnostic equipment requiring stable component supply, long-lifecycle assurance, and RoHS-compliant through-hole packaging.

Supply support for DS1249Y-70 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and nonvolatile memory solutions for industrial, medical, and communications applications.

The DS1249Y-70 belongs to Maxim's legacy nonvolatile SRAM product line, engineered specifically for systems demanding zero-support-circuitry, guaranteed 10-year data retention, and seamless fail-safe operation under voltage instability.

FAQ

What is the guaranteed data retention period for DS1249Y-70?

The DS1249Y-70 guarantees a minimum of 10 years of data retention in the absence of external power, measured from the time V_CC is first applied. This is ensured by an integrated, factory-sealed lithium energy source and internal power-switching circuitry that activates automatically below ~3.0 V. The DS1249Y-70 achieves this without requiring external capacitors or supervisory ICs.

Does DS1249Y-70 require external components for battery backup operation?

No, the DS1249Y-70 requires no external components for nonvolatile operation. Its lithium energy source is electrically disconnected until first power-up, then automatically engaged during V_CC failure. The DS1249Y-70 integrates all voltage monitoring, switching, and write-protection logic on-die - eliminating the need for backup capacitors, diodes, or reset supervisors.

What is the difference between DS1249Y-70 and DS1249AB-70?

The DS1249Y-70 supports ±10% V_CC (4.5 V–5.5 V) and triggers write protection at 4.25 V (V_TP), making it suitable for unregulated supplies. The DS1249AB-70 requires ±5% V_CC (4.75 V–5.25 V) and protects at 4.50 V. Both share identical pinout, timing (70 ns), and package. The DS1249Y-70 is preferred in brown-out-prone environments.

Is DS1249Y-70 compatible with standard 8-bit microprocessors?

Yes, the DS1249Y-70 is directly compatible with 8-bit microprocessors such as the 80C86, Z80, and 68000 families. Its TTL-compatible address/data/control signals (A0–A17, DQ0–DQ7, CE, WE, OE), 70 ns access time, and no-wait-state operation enable seamless integration without glue logic. The DS1249Y-70 supports standard read/write protocols and requires no initialization sequence.

What does the "IND" suffix mean in DS1249Y-70IND#?

The "IND" suffix in DS1249Y-70IND# denotes qualification for the industrial temperature range of –40°C to +85°C, with full electrical performance and timing compliance across that range. The DS1249Y-70IND# retains all features of the DS1249Y-70 - including ±10% V_CC, 70 ns access, and 10-year retention - while extending operational reliability to extreme ambient conditions.

DS1249Y-70 Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 32-DIP Module (0.600", 15.24mm)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: NVSRAM

Technology:: NVSRAM (Non-Volatile SRAM)

Memory Size:: 2Mbit

Memory Organization:: 256K x 8

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 70ns

Access Time:: 70 ns

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 32-EDIP

DS1249Y-70 FAQ

1.How can I place an order for DS1249Y-70 through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1249Y-70 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for DS1249Y-70 reliable?

The price and inventory of DS1249Y-70 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1249Y-70 is usually 5 days.

3.What payment methods are accepted for DS1249Y-70?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1249Y-70 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1249Y-70?

DS1249Y-70 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1249Y-70 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for DS1249Y-70?

For technical support, including DS1249Y-70 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1249Y-70 requirements.

6.How does Aetrix verify that DS1249Y-70 is sourced from the original manufacturer or authorized distributors?

All DS1249Y-70 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS1249Y-70 meets industry standards.

7.What is the process for return or replacement of DS1249Y-70?

All DS1249Y-70 units undergo pre-shipment inspection (PSI). If there is an issue with DS1249Y-70, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The DS1249Y-70 part is unused and in its original packaging.

Return procedure for DS1249Y-70:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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