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

Analog Devices Inc./Maxim Integrated DS1250AB-70IND

Name: DS1250AB-70IND
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1250AB-70IND
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1250AB-70IND

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Memory

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

Datasheet:: DS1250AB-70IND.pdf

Description:: IC NVSRAM 4MBIT PARALLEL 32EDIP

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Product details

Overview

DS1250AB-70IND from Maxim Integrated is a 4,194,304-bit (524,288 × 8) nonvolatile static RAM with lithium backup, ±5% V_CC tolerance (4.75–5.25 V), 70 ns access time, and industrial temperature range (–40°C to +85°C). It replaces volatile SRAM, EEPROM, or Flash in battery-critical data logging systems where write endurance and instant-on retention are essential.

For engineers reviewing the DS1250AB-70IND datasheet, DS1250AB-70IND pinout, DS1250AB-70IND application, or DS1250AB-70IND equivalent, key selection criteria include guaranteed 10-year data retention without power, automatic write protection during brownout, JEDEC-standard 32-pin DIP compatibility, and self-contained lithium energy source with freshness seal activation on first power-up.

Technical Context

The DS1250AB-70IND integrates SRAM, lithium battery, and voltage-monitoring control circuitry into a single monolithic package. Its power-fail detection triggers at V_TP = 4.50–4.75 V, switching to battery backup when V_CC drops below ~3.0 V while forcing CE/WE inactive and outputs to high-Z within 1.5 µs.

It operates in three distinct modes: read (CE/OE low, WE high), write (CE/WE low), and data retention (V_CC < 3.0 V, lithium-powered, all inputs ignored). The device requires no external support circuitry and supports unlimited write cycles with full byte-wide parallel interface compliance.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	4,194,304 bits (524,288 × 8); directly replaces 512k × 8 SRAM without address decoding changes
Access Time	70 ns; enables direct interfacing with 14 MHz microprocessors without wait states
V_CC Range	4.75 V to 5.25 V (±5%); ensures stable operation across noisy industrial 5 V rails
Data Retention	10 years minimum without external power; guaranteed by sealed lithium cell and internal switch disconnect until first power-up
Operating Temp	–40°C to +85°C; qualified for industrial control, metering, and transportation electronics
Write Cycles	Unlimited; eliminates wear-out concerns in high-frequency logging or configuration storage
Package	32-pin JEDEC-standard 740-mil extended DIP; drop-in compatible with legacy 512k × 8 SRAM footprints

Pinout & Package

DS1250AB-70IND uses a 32-pin JEDEC-standard 740-mil extended DIP (EDIP) package with integrated lithium battery and control logic. All pins conform to industry-standard byte-wide SRAM pinout, enabling direct replacement of volatile memory without PCB redesign.

Pin	Circuit Role	Design Meaning
A0–A18	Address Inputs	19-bit address bus supporting full 524,288-word addressing; TTL-compatible input thresholds
DQ0–DQ7	Data I/O	Bi-directional 8-bit data bus with 2 mA sink / –1 mA source drive; high-impedance during deselect/write
CE	Chip Enable	Active-low chip select; forces high-Z output and disables internal logic when high
WE	Write Enable	Active-low write strobe; controls write timing and disables outputs during write if OE is active
OE	Output Enable	Active-low output enable; allows read data to appear only when CE and OE are both low
V_CC	Power Supply	+5 V ±5% main supply; powers SRAM and control logic; triggers lithium activation on first application >4.25 V
GND	Ground	Reference return for all signals and power; isolated from battery ground path during retention mode
NC	No Connect	Pins 1 and 32 are unconnected; no internal bonding or function; must remain floating

Key Features

Feature	Design Value
Automatic Power-Fail Protection	Monitors V_CC continuously; asserts write protect and switches to lithium backup within 1.5 µs when V_CC falls below 4.5 V
Freshness Seal Activation	Lithium cell remains electrically disconnected until first V_CC application >4.25 V, preserving full 10-year capacity
Zero-External-Support Interface	Standard parallel SRAM timing and pinout; no glue logic, regulators, or supervisors required for microprocessor integration
Industrial Temperature Qualification	Full DC/AC specs guaranteed from –40°C to +85°C; validated per Maxim's industrial reliability test flow
Unlimited Write Endurance	Eliminates write-cycle limits inherent in EEPROM/Flash; suitable for real-time event logging with sub-second updates

Applications

Industrial Data Logger	Smart Electricity Meter
Use Scenario: Continuous timestamped recording of voltage, current, and energy consumption in utility-grade meters operating unattended for 15+ years. IC Role / Device Role / Timing Role: Nonvolatile SRAM storing last-read values, calibration constants, and tamper logs with guaranteed 10-year retention during grid outages. Use Value: Eliminates need for external EEPROM write-delay management and avoids flash wear leveling complexity while ensuring deterministic data integrity.	Use Scenario: Storing billing cycle data, tariff tables, and firmware update staging in ANSI C12.22-compliant meters deployed in outdoor substations. IC Role / Device Role / Timing Role: Primary configuration and event memory with automatic brownout capture during lightning-induced sags or transformer faults. Use Value: Maintains accurate kWh accumulation and outage records even during repeated short-duration power interruptions common in rural grids.
Railway Signaling Controller	Programmable Logic Controller (PLC)
Use Scenario: Capturing fault codes, sensor history, and interlocking state snapshots in EN 5012x-certified signaling hardware exposed to wide ambient swings. IC Role / Device Role / Timing Role: Fail-safe memory holding critical safety state prior to controlled shutdown during loss of track power. Use Value: Meets SIL-2 data retention requirements without external capacitors or backup supplies, reducing BOM count and failure modes.	Use Scenario: Preserving ladder logic runtime variables, I/O mapping, and diagnostic counters in DIN-rail mounted PLCs used in factory automation. IC Role / Device Role / Timing Role: Volatile memory replacement that retains process state across unexpected AC loss or emergency stop events. Use Value: Enables immediate resumption of control sequences after power restoration-no re-homing or warm-up delay required.

Industrial Data Logger

Smart Electricity Meter

Use Scenario: Continuous timestamped recording of voltage, current, and energy consumption in utility-grade meters operating unattended for 15+ years.

IC Role / Device Role / Timing Role: Nonvolatile SRAM storing last-read values, calibration constants, and tamper logs with guaranteed 10-year retention during grid outages.

Use Value: Eliminates need for external EEPROM write-delay management and avoids flash wear leveling complexity while ensuring deterministic data integrity.

Use Scenario: Storing billing cycle data, tariff tables, and firmware update staging in ANSI C12.22-compliant meters deployed in outdoor substations.

IC Role / Device Role / Timing Role: Primary configuration and event memory with automatic brownout capture during lightning-induced sags or transformer faults.

Use Value: Maintains accurate kWh accumulation and outage records even during repeated short-duration power interruptions common in rural grids.

Railway Signaling Controller

Programmable Logic Controller (PLC)

Use Scenario: Capturing fault codes, sensor history, and interlocking state snapshots in EN 5012x-certified signaling hardware exposed to wide ambient swings.

IC Role / Device Role / Timing Role: Fail-safe memory holding critical safety state prior to controlled shutdown during loss of track power.

Use Value: Meets SIL-2 data retention requirements without external capacitors or backup supplies, reducing BOM count and failure modes.

Use Scenario: Preserving ladder logic runtime variables, I/O mapping, and diagnostic counters in DIN-rail mounted PLCs used in factory automation.

IC Role / Device Role / Timing Role: Volatile memory replacement that retains process state across unexpected AC loss or emergency stop events.

Use Value: Enables immediate resumption of control sequences after power restoration-no re-homing or warm-up delay required.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS1250Y-70IND+	Wider V_CC tolerance (±10%, 4.5–5.5 V); lower write-protection threshold (4.25 V vs. 4.50 V)	Better suited for systems with unstable 5 V rails or legacy designs requiring looser regulation	Select DS1250Y-70IND+ only if system V_CC variation exceeds ±5% or brownout sensitivity must be earlier
STK12C68-70I	Same 512k × 8 organization and 70 ns speed but uses external capacitor-based backup; no integrated lithium	Requires external 0.1–0.47 F supercapacitor and charging circuit; shorter retention (~1–5 years)	Choose STK12C68-70I only when lithium-free design is mandated or cost sensitivity outweighs retention/reliability needs

Compared with DS1250Y-70IND+, the DS1250AB-70IND offers tighter supply regulation and higher write-protection voltage-critical for noise-immune industrial environments-while STK12C68-70I trades integrated reliability for component-level flexibility and RoHS lithium exemption.

Availability

DS1250AB-70IND is available at Aetrix Electronics and suitable for industrial data loggers, smart electricity meters, railway signaling controllers, and programmable logic controllers requiring stable component supply with guaranteed 10-year data retention and industrial temperature performance.

Supply support for DS1250AB-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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.

The DS1250AB-70IND belongs to Maxim's nonvolatile SRAM product line, engineered specifically for mission-critical data retention in infrastructure equipment where power interruption resilience and long-term reliability are non-negotiable.

FAQ

What is the guaranteed data retention period for DS1250AB-70IND?

The DS1250AB-70IND guarantees a minimum of 10 years of data retention in the absence of external power. This specification is assured by component selection, process control, and design-not measured per unit-and begins counting from the moment V_CC is first applied above 4.25 V, which activates the sealed lithium energy source inside the DS1250AB-70IND.

Does DS1250AB-70IND require external circuitry for battery backup operation?

No, the DS1250AB-70IND requires no external circuitry for battery backup operation. It integrates a lithium energy source, voltage monitor, and power-switching logic into a single 32-pin DIP package. The DS1250AB-70IND automatically detects V_CC decay, disables writes, and switches to lithium power without any external components or firmware intervention.

Is DS1250AB-70IND pin-compatible with standard 512k × 8 SRAMs?

Yes, the DS1250AB-70IND uses a JEDEC-standard 32-pin 740-mil extended DIP footprint with identical pinout to conventional 512k × 8 volatile SRAMs. Its A0–A18, DQ0–DQ7, CE, WE, OE, V_CC, and GND assignments match industry-standard byte-wide SRAM layouts, enabling direct replacement without PCB modification.

What happens to DS1250AB-70IND during a rapid power-down event?

During rapid power-down, the DS1250AB-70IND detects V_CC falling below its 4.50–4.75 V write-protection threshold within 1.5 µs, immediately disabling CE and WE, placing outputs in high-Z, and switching to lithium backup before V_CC reaches 3.0 V. This prevents partial writes and ensures atomic data preservation for the DS1250AB-70IND.

Can DS1250AB-70IND be used in surface-mount designs?

The DS1250AB-70IND itself is a through-hole 32-pin DIP and is not surface-mountable. For SMT applications, use the pin-compatible DS1250ABP-70IND+ PowerCap Module variant, which mates with the DS9034PCI+ snap-on PowerCap. The DS1250AB-70IND is intended for wave-soldered or hand-soldered industrial boards where long-term serviceability and field-replaceability are prioritized.

DS1250AB-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:: Obsolete

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: NVSRAM

Technology:: NVSRAM (Non-Volatile SRAM)

Memory Size:: 4Mbit

Memory Organization:: 512K x 8

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 70ns

Access Time:: 70 ns

Voltage - Supply:: 4.75V ~ 5.25V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 32-EDIP

DS1250AB-70IND FAQ

1.How can I place an order for DS1250AB-70IND through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1250AB-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 DS1250AB-70IND reliable?

The price and inventory of DS1250AB-70IND are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1250AB-70IND is usually 5 days.

3.What payment methods are accepted for DS1250AB-70IND?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1250AB-70IND transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1250AB-70IND?

DS1250AB-70IND orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1250AB-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 DS1250AB-70IND?

For technical support, including DS1250AB-70IND datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1250AB-70IND requirements.

6.How does Aetrix verify that DS1250AB-70IND is sourced from the original manufacturer or authorized distributors?

All DS1250AB-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 DS1250AB-70IND meets industry standards.

7.What is the process for return or replacement of DS1250AB-70IND?

All DS1250AB-70IND units undergo pre-shipment inspection (PSI). If there is an issue with DS1250AB-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 DS1250AB-70IND part is unused and in its original packaging.

Return procedure for DS1250AB-70IND:

1.Submit a request within 90 days.

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

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