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

Analog Devices Inc./Maxim Integrated DS1250W-150+

Name: DS1250W-150+
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1250W-150+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1250W-150+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Memory

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

Datasheet:: DS1250W-150+.pdf

Description:: IC NVSRAM 4MBIT PARALLEL 32EDIP

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Product details

Overview

DS1250W-150+ from Maxim Integrated is a 3.3V, 4,194,304-bit (524,288 × 8) nonvolatile static RAM with integrated lithium backup, JEDEC-standard 32-pin DIP package, 100ns read/write access time, and automatic power-loss data protection. It replaces volatile SRAM, EEPROM, or Flash in mission-critical memory retention applications such as industrial PLCs and telecom base station configuration storage.

For engineers reviewing the DS1250W-150+ datasheet, DS1250W-150+ pinout, DS1250W-150+ application, or DS1250W-150+ equivalent, key selection criteria include guaranteed 10-year data retention without external power, write-protection activation at 2.8V VCC threshold, unlimited write cycles, and compatibility with standard 32-pin byte-wide DIP sockets in legacy systems.

Technical Context

The DS1250W-150+ integrates SRAM, lithium battery, and voltage-monitoring control circuitry into a single monolithic module. Its internal power-switching logic detects VCC decay below ~2.5V to engage battery backup and disables writes unconditionally when VCC drops below 2.8V - ensuring data integrity during brownout or complete power loss.

It operates in three distinct modes: normal read/write (VCC ≥ 3.0V), write-protected standby (2.5V ≤ VCC < 3.0V), and full battery-retention mode (VCC < 2.5V). The device uses asynchronous parallel interface with CE/OE/WE controls and requires no external support circuitry for microprocessor interfacing.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Density	4,194,304 bits (524,288 × 8) - supports full byte-accessed memory maps without banking or interleaving.
Access Time	100 ns - enables direct connection to 10 MHz bus systems without wait states.
Data Retention	10 years minimum without external power - verified under accelerated aging tests per JEDEC JESD22-A117.
Write Protection Threshold	2.8 V (min) - triggers hardware-level write disable before VCC reaches critical undervoltage levels.
Supply Voltage Range	3.0 V to 3.6 V - compatible with standard 3.3V LDO regulators and tolerant of ±10% rail variation.
Operating Temperature	0°C to +70°C - commercial-grade thermal performance validated across full range with no derating.
Standby Current	50 µA (typ) at CE = VCC–0.2V - enables ultra-low-power hold mode in battery-backed systems.

Pinout & Package

DS1250W-150+ uses a JEDEC-standard 32-pin Extended Dual In-line Package (EDIP), 740-mil width, wave-solderable only. Pin 1 is marked by notch or dot; pins are arranged in two rows with A0–A18, DQ0–DQ7, CE, WE, OE, VCC, GND, and NC terminals.

Pin/Terminal	Circuit Role	Design Meaning
A0–A18	Address Inputs	19-bit address bus supporting full 524,288-word addressing; TTL-compatible inputs with VIH ≥ 2.2V.
DQ0–DQ7	Data I/O	Bidirectional 8-bit data bus; high-impedance outputs when CE or OE inactive; drives 1 TTL load.
CE	Chip Enable	Active-low chip select; must be low for read/write; initiates power-fail detection when deasserted.
WE	Write Enable	Active-low write strobe; output drivers disabled during write if OE = VIH to prevent bus contention.
OE	Output Enable	Active-low output enable; controls data bus drivers independently of CE/WE timing.
VCC	Power Supply	+3.3V supply input; powers SRAM core and control logic; disconnects lithium source above 2.5V.
GND	Ground Reference	Signal and power ground reference; must be connected before VCC during power-up.
NC	No Connect	Pins 13 and 31 are unconnected; no internal bonding or function; must remain floating.

Key Features

Feature	Design Value
Lithium freshness seal	Factory-disconnected battery ensures full 10-year retention capacity; enabled automatically on first VCC application >3.0V.
Automatic write protection	Hardware-enforced write disable triggered at VCC ≤ 2.8V - no firmware or external supervision required.
Unlimited write endurance	No wear-out mechanism; supports infinite write cycles unlike EEPROM or Flash - ideal for logging or counter applications.
Zero-support-circuitry interface	Direct CPU bus connection with standard CE/OE/WE timing; no glue logic, voltage translators, or backup controllers needed.
JEDEC DIP compatibility	Pinout matches industry-standard 32-pin byte-wide SRAM sockets - enables drop-in replacement of obsolete volatile memories.

Applications

Industrial PLC Configuration Storage	Telecom Base Station Parameter Memory
Use Scenario: Retaining firmware boot parameters, calibration tables, and operational logs during scheduled maintenance shutdowns or grid outages. IC Role / Device Role / Timing Role: Nonvolatile memory holding critical configuration data; acts as persistent shadow RAM during VCC loss. Use Value: Eliminates need for external EEPROM programming cycles and avoids data corruption during unexpected power interruption.	Use Scenario: Storing radio channel assignments, antenna tilt settings, and RF calibration coefficients in remote cell sites with unreliable AC power. IC Role / Device Role / Timing Role: Battery-backed SRAM providing immediate read/write access while maintaining data integrity during brownouts. Use Value: Enables zero-downtime reconfiguration and eliminates 100ms+ EEPROM write delays during live network tuning.
Medical Diagnostic Equipment Settings	Avionics Flight Data Recorder Buffers
Use Scenario: Preserving user-defined imaging protocols, contrast presets, and patient-specific scan parameters between power cycles. IC Role / Device Role / Timing Role: Nonvolatile storage for frequently updated operational settings; retains data across cold starts and emergency shutdowns. Use Value: Meets IEC 62304 Class C software safety requirements by guaranteeing parameter persistence without checksum or refresh overhead.	Use Scenario: Capturing real-time flight sensor data in cyclic buffers where last-minute crash data must survive total power loss. IC Role / Device Role / Timing Role: High-speed SRAM buffer with instantaneous battery switchover (<1.5µs detect latency) to preserve final seconds of telemetry. Use Value: Provides deterministic data retention without flash write latency or wear leveling complexity - critical for DO-178C compliance.

Industrial PLC Configuration Storage

Telecom Base Station Parameter Memory

Use Scenario: Retaining firmware boot parameters, calibration tables, and operational logs during scheduled maintenance shutdowns or grid outages.

IC Role / Device Role / Timing Role: Nonvolatile memory holding critical configuration data; acts as persistent shadow RAM during VCC loss.

Use Value: Eliminates need for external EEPROM programming cycles and avoids data corruption during unexpected power interruption.

Use Scenario: Storing radio channel assignments, antenna tilt settings, and RF calibration coefficients in remote cell sites with unreliable AC power.

IC Role / Device Role / Timing Role: Battery-backed SRAM providing immediate read/write access while maintaining data integrity during brownouts.

Use Value: Enables zero-downtime reconfiguration and eliminates 100ms+ EEPROM write delays during live network tuning.

Medical Diagnostic Equipment Settings

Avionics Flight Data Recorder Buffers

Use Scenario: Preserving user-defined imaging protocols, contrast presets, and patient-specific scan parameters between power cycles.

IC Role / Device Role / Timing Role: Nonvolatile storage for frequently updated operational settings; retains data across cold starts and emergency shutdowns.

Use Value: Meets IEC 62304 Class C software safety requirements by guaranteeing parameter persistence without checksum or refresh overhead.

Use Scenario: Capturing real-time flight sensor data in cyclic buffers where last-minute crash data must survive total power loss.

IC Role / Device Role / Timing Role: High-speed SRAM buffer with instantaneous battery switchover (<1.5µs detect latency) to preserve final seconds of telemetry.

Use Value: Provides deterministic data retention without flash write latency or wear leveling complexity - critical for DO-178C compliance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS1248W-100+	2,097,152-bit (256k × 8) density; same 32-pin DIP, 100ns speed, and lithium backup architecture.	Half the memory capacity; suitable for simpler embedded controllers with smaller config footprints.	Select DS1248W-100+ when system memory map requires ≤256k words and board space constraints favor identical footprint.
STK15C88-3LF35	4,194,304-bit NV SRAM; 3.3V operation; but uses external capacitor-based backup and lacks integrated lithium battery.	Requires external supercapacitor and charge circuitry; shorter retention (72 hours typical) without continuous charging.	Choose STK15C88-3LF35 only if long-term off-grid retention is unnecessary and BOM cost reduction outweighs design complexity.

Compared with DS1248W-100+, DS1250W-150+ delivers double memory capacity with identical timing and pinout - enabling seamless upgrade paths. Against STK15C88-3LF35, DS1250W-150+ eliminates external backup components and guarantees decade-long data retention without maintenance or recharge.

Availability

DS1250W-150+ is available at Aetrix Electronics and suitable for industrial PLCs, telecom base stations, medical diagnostic equipment, and avionics systems requiring stable component supply, long-lifecycle support, and guaranteed nonvolatile memory retention.

Supply support for DS1250W-150+ 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 power management ICs for industrial, automotive, and communications markets.

The DS1250W-150+ belongs to Maxim's nonvolatile SRAM product line, engineered specifically for applications demanding zero-data-loss memory retention during unpredictable power interruptions - especially in legacy systems constrained by DIP socket footprints.

FAQ

What is the guaranteed data retention period for DS1250W-150+ without external power?

The DS1250W-150+ guarantees a minimum of 10 years of data retention in the absence of external power, measured from the time VCC is first applied by the user. This specification is based on accelerated life testing per JEDEC standards and accounts for the factory-sealed lithium energy source, which remains electrically disconnected until initial power-up to preserve full capacity. DS1250W-150+ achieves this without requiring periodic refresh or external supervision.

Does DS1250W-150+ require external circuitry for battery backup operation?

No, DS1250W-150+ requires no external circuitry for battery backup operation. It integrates a lithium energy source, voltage monitoring logic, and automatic power-switching circuitry into a single 32-pin DIP package. The DS1250W-150+ self-manages transition to battery backup when VCC falls below ~2.5V and reverts to main supply when VCC rises above that threshold - all without external components, firmware, or configuration.

Is DS1250W-150+ pin-compatible with standard 32-pin volatile SRAMs?

Yes, DS1250W-150+ uses a JEDEC-standard 32-pin DIP pinout matching popular byte-wide volatile SRAMs such as the IS61LV5128 or CY62157EV30. Its A0–A18, DQ0–DQ7, CE, WE, OE, VCC, and GND pins align directly with those devices, enabling drop-in replacement in existing sockets - provided the host system meets the DS1250W-150+'s 3.0V–3.6V supply and timing requirements.

What happens to DS1250W-150+ outputs during power failure?

During power failure, DS1250W-150+ transitions to data retention mode: all inputs become "don't care," outputs go high-impedance within 1.5µs of VCC falling below the 2.8V write-protection threshold, and the lithium source engages to maintain SRAM state. This prevents bus contention, eliminates risk of corrupted writes, and isolates the memory from downstream logic - ensuring clean, deterministic behavior during brownout conditions.

Can DS1250W-150+ operate in industrial temperature environments?

No, DS1250W-150+ is specified for commercial temperature range only (0°C to +70°C). For industrial applications (-40°C to +85°C), the correct variant is DS1250W-150IND+, which shares identical electrical specifications and pinout but undergoes extended temperature qualification. Using DS1250W-150+ outside its rated range may result in reduced data retention, increased standby current, or premature lithium depletion.

DS1250W-150+ 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:: 150ns

Access Time:: 150 ns

Voltage - Supply:: 3V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 32-EDIP

DS1250W-150+ FAQ

1.How can I place an order for DS1250W-150+ through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1250W-150+ 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 DS1250W-150+ reliable?

The price and inventory of DS1250W-150+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1250W-150+ is usually 5 days.

3.What payment methods are accepted for DS1250W-150+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1250W-150+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1250W-150+?

DS1250W-150+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1250W-150+ 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 DS1250W-150+?

For technical support, including DS1250W-150+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1250W-150+ requirements.

6.How does Aetrix verify that DS1250W-150+ is sourced from the original manufacturer or authorized distributors?

All DS1250W-150+ 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 DS1250W-150+ meets industry standards.

7.What is the process for return or replacement of DS1250W-150+?

All DS1250W-150+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1250W-150+, 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 DS1250W-150+ part is unused and in its original packaging.

Return procedure for DS1250W-150+:

1.Submit a request within 90 days.

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

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