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

Analog Devices Inc./Maxim Integrated DS1249Y-70IND#

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

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Part No.:: DS1249Y-70IND#

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Memory

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

Datasheet:: DS1249Y-70IND#.pdf

Description:: IC NVSRAM 2MBIT PARALLEL 32EDIP

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Product details

Overview

DS1249Y-70IND# 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 operation (4.5V–5.5V), industrial temperature range (–40°C to +85°C), and integrated lithium battery backup for 10-year data retention without external power. It serves as drop-in SRAM replacement in mission-critical memory hold applications during power loss.

For engineers reviewing the DS1249Y-70IND# datasheet, DS1249Y-70IND# pinout, DS1249Y-70IND# application, or DS1249Y-70IND# equivalent, key selection factors include guaranteed 10-year data retention, automatic write protection at V_TP = 4.25V–4.5V, JEDEC-standard 32-pin 740-mil extended DIP package, and compatibility with standard microprocessor bus timing.

Technical Context

The DS1249Y-70IND# implements fully static NV SRAM architecture with on-chip voltage monitoring and lithium power switching circuitry that activates below ~3.0V to maintain data integrity. Its control logic enforces unconditional write protection when V_CC falls outside tolerance, forcing all inputs to "don't care" and outputs to high-impedance.

It supports standard asynchronous parallel interface timing: t_ACC = 70 ns, t_WC = 70 ns, t_OE = 35 ns, and operates across full ±10% V_CC (4.5V–5.5V) with write-protection threshold V_TP = 4.25V (min) to 4.5V (max), validated over –40°C to +85°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Density	2,097,152 bits (262,144 × 8) - provides byte-wide addressing for legacy microprocessor systems without external data-width conversion.
Access Time	70 ns - enables direct interface with 14 MHz bus clocks and meets timing margins for Intel 80C86/80C88 and Motorola 68000 families.
V_CC Range	4.5V to 5.5V (±10%) - accommodates wide-input power rails in industrial power supplies without regulation overhead.
Data Retention	10 years minimum without external power - achieved via sealed lithium cell and automatic switchover at ~3.0V, eliminating need for external backup capacitors or batteries.
Write Protection Threshold	V_TP = 4.25V (min) to 4.5V (max) - triggers unconditional write lock before system brownout corrupts memory writes.
Operating Temperature	–40°C to +85°C - qualified for deployment in uncontrolled industrial enclosures, transportation control units, and energy metering hardware.
Package	32-pin 740-mil extended DIP (MDT32#7) - compatible with through-hole PCB assembly and legacy socketed memory designs.

Pinout & Package

DS1249Y-70IND# uses a JEDEC-standard 32-pin Extended Dual In-line Package (EDIP), 740 mil width, with lead finish compliant to RoHS exemption criteria. Pin 1 is marked by notch or dot; pins are arranged in two rows with A0–A17, DQ0–DQ7, CE, WE, OE, V_CC, GND, and NC terminals.

Pin/Terminal	Circuit Role	Design Meaning
A0–A17	Address Inputs	18-bit address bus supporting full 262,144-word decoding; TTL-compatible input thresholds (V_IL ≤ 0.8V, V_IH ≥ 2.2V).
DQ0–DQ7	Data I/O	Bi-directional 8-bit data bus with 2.0 mA sink / –1.0 mA source drive; high-impedance state enforced during write or deselection.
CE	Chip Enable	Active-low chip select; must be low with WE low to initiate write; forces high-Z output if deasserted during read.
WE	Write Enable	Active-low write strobe; controls data latching and disables outputs when asserted during read to prevent bus contention.
OE	Output Enable	Active-low output enable; allows read data to appear only when CE and OE are both low; high during write prevents driver conflict.
V_CC	Power Supply	+5V supply pin; powers SRAM core and control logic; monitored continuously for V_TP violation and automatic backup activation.
GND	Ground	Reference return path for all signals and internal lithium switch circuitry; requires low-inductance connection for reliable power-down detection.
NC	No Connect	Pin 16 is unconnected internally; must remain floating or tied to ground per layout guidelines to avoid noise coupling.

Key Features

Feature	Design Value
Automatic Power-Fail Write Protection	Hardware-enforced lockout triggered at V_TP = 4.25V–4.5V, eliminating firmware dependency and guaranteeing data integrity during brownout.
Lithium Energy Source Freshness Seal	Factory-disconnected Li cell ensures full 10-year retention capacity; activated only on first V_CC application above V_TP, preventing shelf-life degradation.
Unlimited Write Cycles	No endurance limit on SRAM core - supports continuous logging, configuration storage, and real-time data buffering without wear leveling.
Low-Power CMOS Operation	Standby current as low as 100 µA (ICCS2) and operating current 85 mA - reduces thermal load in sealed industrial housings.
Full ±10% V_CC Tolerance	Operates across 4.5V–5.5V without external regulators - simplifies power design in variable-input environments like solar-powered telemetry nodes.

Applications

Industrial Data Loggers	Medical Device Configuration Storage
Use Scenario: Continuous acquisition of sensor readings in oil-field downhole tools where mains power is intermittent and battery replacement is impossible. IC Role / Device Role / Timing Role: Nonvolatile SRAM holding last valid calibration, timestamped event logs, and fault history during multi-hour power outages. Use Value: Guarantees 10-year data retention without refresh or external backup; eliminates risk of log corruption during sudden V_CC collapse.	Use Scenario: Storing patient-specific therapy parameters and device calibration constants in portable infusion pumps certified to IEC 60601-1. IC Role / Device Role / Timing Role: Fail-safe memory buffer retaining critical settings across battery swaps and AC power interruptions. Use Value: Meets medical regulatory requirements for deterministic data preservation; write protection activates before brownout-induced bit flips occur.
Energy Meter Firmware Patch Storage	Railway Signaling Controller State Backup
Use Scenario: Holding firmware patch images and metering algorithm updates in ANSI C12.22-compliant smart meters deployed in remote substations. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory partition for verified code segments awaiting safe execution after power restoration. Use Value: Enables field-upgradable firmware without requiring EEPROM wear leveling or flash erase cycles; 70 ns access supports real-time metering interrupt response.	Use Scenario: Preserving interlocking logic state and signal aspect history in EN 5012x-certified railway signaling cabinets exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Volatile-but-persistent memory node maintaining fail-safe operational context during grid voltage sags and generator transitions. Use Value: Industrial temperature rating (–40°C to +85°C) and automatic lithium switchover ensure uninterrupted state retention across rail infrastructure environments.

Industrial Data Loggers

Medical Device Configuration Storage

Use Scenario: Continuous acquisition of sensor readings in oil-field downhole tools where mains power is intermittent and battery replacement is impossible.

IC Role / Device Role / Timing Role: Nonvolatile SRAM holding last valid calibration, timestamped event logs, and fault history during multi-hour power outages.

Use Value: Guarantees 10-year data retention without refresh or external backup; eliminates risk of log corruption during sudden V_CC collapse.

Use Scenario: Storing patient-specific therapy parameters and device calibration constants in portable infusion pumps certified to IEC 60601-1.

IC Role / Device Role / Timing Role: Fail-safe memory buffer retaining critical settings across battery swaps and AC power interruptions.

Use Value: Meets medical regulatory requirements for deterministic data preservation; write protection activates before brownout-induced bit flips occur.

Energy Meter Firmware Patch Storage

Railway Signaling Controller State Backup

Use Scenario: Holding firmware patch images and metering algorithm updates in ANSI C12.22-compliant smart meters deployed in remote substations.

IC Role / Device Role / Timing Role: Secure, tamper-resistant memory partition for verified code segments awaiting safe execution after power restoration.

Use Value: Enables field-upgradable firmware without requiring EEPROM wear leveling or flash erase cycles; 70 ns access supports real-time metering interrupt response.

Use Scenario: Preserving interlocking logic state and signal aspect history in EN 5012x-certified railway signaling cabinets exposed to wide ambient temperature swings.

IC Role / Device Role / Timing Role: Volatile-but-persistent memory node maintaining fail-safe operational context during grid voltage sags and generator transitions.

Use Value: Industrial temperature rating (–40°C to +85°C) and automatic lithium switchover ensure uninterrupted state retention across rail infrastructure environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS1248Y-70IND#	1024k density (131,072 × 8), same 70 ns speed, identical V_CC range and industrial temp grade.	Half the memory capacity; suitable where firmware/config footprint fits within 128 KB.	Select when board space or BOM cost reduction outweighs need for 256 KB memory map.
STK12C68-E6F	2048k NV SRAM, 70 ns access, but ±5% V_CC (4.75V–5.25V) and commercial temp only (0°C to +70°C).	Lacks industrial temperature qualification and wider V_CC tolerance; no freshness seal guarantee.	Acceptable for benign environments with stable regulated 5V supplies; not recommended for field-deployed industrial equipment.

Compared with DS1249Y-70IND#, DS1248Y-70IND# offers identical reliability and interface but reduced density, while STK12C68-E6F trades industrial qualification and voltage flexibility for lower unit cost in controlled lab or benchtop systems.

Availability

DS1249Y-70IND# is available at Aetrix Electronics and suitable for industrial data loggers, medical device configuration storage, and energy meter firmware patch storage requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for DS1249Y-70IND# 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, automotive, and communications markets.

The DS1249Y-70IND# belongs to Maxim's nonvolatile SRAM product line, engineered specifically for zero-maintenance, long-retention memory hold in systems where power interruption is frequent and external backup is impractical.

FAQ

What is the guaranteed data retention period for DS1249Y-70IND# under zero-power conditions?

The DS1249Y-70IND# guarantees a minimum 10-year data retention period when powered off, based on built-in lithium cell capacity, hermetic sealing, and automatic power-switching circuitry. This value is assured by component selection and process control-not production-tested per unit-but applies cumulatively from first V_CC application onward.

Does DS1249Y-70IND# require external circuitry to manage battery backup or write protection?

No, DS1249Y-70IND# requires no external components for backup operation or write protection. Its integrated control circuitry monitors V_CC continuously, switches to lithium power below ~3.0V, and enforces unconditional write lock at V_TP = 4.25V–4.5V-eliminating need for supervisor ICs, diodes, or capacitors.

What is the meaning of "IND" in DS1249Y-70IND# and how does it affect operation?

The "IND" suffix in DS1249Y-70IND# denotes qualification for the industrial temperature range (–40°C to +85°C), with all DC and AC specifications-including t_ACC, V_TP, and standby current-guaranteed across this full range. It also confirms RoHS compliance with applicable exemptions.

Can DS1249Y-70IND# be used as a direct replacement for standard 256 KB SRAMs like the AS6C4008?

Yes, DS1249Y-70IND# is pin-compatible and functionally equivalent to standard 262,144 × 8 SRAMs such as the AS6C4008 in read/write timing and bus interface, but adds nonvolatility and automatic write protection. No PCB changes are required, though V_CC tolerance (±10%) and industrial temp rating exceed those of commodity SRAMs.

How does the "Freshness Seal" mechanism work in DS1249Y-70IND#?

The DS1249Y-70IND# ships with its internal lithium cell electrically disconnected. On first application of V_CC > V_TP, an on-chip switch permanently connects the cell, preserving full energy capacity for the full 10-year retention window-preventing self-discharge during storage or distribution.

DS1249Y-70IND# 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:: Active

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:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 32-EDIP

DS1249Y-70IND# FAQ

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

Please submit a Request for Quotation (RFQ) for DS1249Y-70IND# 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-70IND# reliable?

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

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

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1249Y-70IND#?

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

Once your DS1249Y-70IND# 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-70IND#?

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

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

All DS1249Y-70IND# 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-70IND# meets industry standards.

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

All DS1249Y-70IND# units undergo pre-shipment inspection (PSI). If there is an issue with DS1249Y-70IND#, 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-70IND# part is unused and in its original packaging.

Return procedure for DS1249Y-70IND#:

1.Submit a request within 90 days.

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

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