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Analog Devices Inc./Maxim Integrated DS1249W-150
- Part No.:
- DS1249W-150
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- 32-DIP Module (0.600", 15.24mm)
- Datasheet:
-
DS1249W-150.pdf
- Description:
- IC NVSRAM 2MBIT PARALLEL 32EDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,397
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Product details
Overview
DS1249W-150 from Maxim Integrated is a 3.3V, 2048kb (262,144 × 8) nonvolatile SRAM with lithium-backed data retention, 100ns read/write access time, automatic write protection below 2.8V, and JEDEC-standard 32-pin extended DIP package. It functions as a drop-in memory replacement in industrial control systems requiring persistent data storage during power loss.
For engineers reviewing the DS1249W-150 datasheet, DS1249W-150 pinout, DS1249W-150 application, or DS1249W-150 equivalent, key selection criteria include guaranteed 10-year data retention without external power, unlimited write cycles, CMOS-compatible 3.3V operation, and self-contained battery switchover at ~2.5V.
Technical Context
The DS1249W-150 implements fully static NV SRAM architecture with integrated lithium energy source and voltage-monitoring circuitry that triggers unconditional write protection when VCC falls below 2.8V. Its power-switching logic autonomously connects the battery to RAM when VCC drops below ~2.5V and disconnects it during power-up above ~2.5V.
It supports standard parallel microprocessor interface timing: CE/OE/WE control logic, 18-bit address bus (A0–A17), 8-bit bidirectional data bus (DQ0–DQ7), and operates across commercial (0°C to +70°C) or industrial (-40°C to +85°C) temperature ranges depending on suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2048kb (262,144 × 8 bits) - provides byte-addressable nonvolatile storage without refresh or external controller |
| Access Time | 100ns - enables direct interfacing with 10MHz microprocessors without wait states |
| VCC Operating Range | 3.0V to 3.6V - compatible with standard 3.3V logic rails and tolerant of typical supply ripple |
| Data Retention | 10 years minimum without external power - sustained by internal lithium cell activated only during power loss |
| Write Protection Threshold | 2.8V to 3.0V - ensures early, deterministic lockout before supply collapse corrupts writes |
| Temperature Range | -40°C to +85°C (IND variant) - validated for use in uncontrolled industrial environments |
| Package | 32-pin 740mil extended DIP - supports through-hole mounting and legacy board layouts |
Pinout & Package
DS1249W-150 uses a JEDEC-standard 32-pin extended dual in-line package (EDIP), 740mil width, with 0.1" lead pitch and wave/hand-solder compatible construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus enabling full 262,144-word addressing; TTL/CMOS compatible |
| DQ0–DQ7 | Data I/O | Bidirectional 8-bit data bus; high-impedance when CE/OE inactive or during write |
| CE | Chip Enable | Active-low chip select; initiates read/write when low with WE/OE conditions met |
| WE | Write Enable | Active-low write strobe; controls data latching and output disable during write |
| OE | Output Enable | Active-low output enable; places DQ lines in high-Z when high during write |
| VCC | Power Supply | +3.3V supply input; powers SRAM core and monitoring circuitry |
| GND | Ground | Reference return path for all signals and internal battery switching |
| NC | No Connect | Pin 16 is unconnected; must remain floating per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Lithium freshness seal | Lithium cell electrically disconnected until first VCC application > VTP, preserving full 10-year capacity |
| Automatic power-fail response | Sub-2.5V battery switchover occurs within 1.5µs of VCC decay detection, preventing data corruption |
| Unlimited write endurance | No wear-out mechanism - supports continuous logging or frequent configuration updates without degradation |
| Zero-support-circuitry interface | Direct connection to 3.3V microcontrollers; no external capacitors, regulators, or backup controllers required |
| High-impedance outputs on deselect | DQ lines enter high-Z state within 35ns of CE/OE deactivation, eliminating bus contention |
Applications
| Industrial PLC Data Logging | Medical Device Configuration Storage |
|---|---|
Use Scenario: Storing runtime parameters, calibration coefficients, and event logs in programmable logic controllers operating in factory-floor environments with unstable AC mains. IC Role / Device Role / Timing Role: Nonvolatile SRAM providing immediate-read/write access and guaranteed 10-year data retention during brownouts or scheduled shutdowns. Use Value: Eliminates need for EEPROM write delays or flash wear-leveling; preserves critical state across unplanned power loss without software intervention. | Use Scenario: Holding patient-specific therapy settings and device calibration data in portable infusion pumps and diagnostic monitors subject to regulatory data integrity requirements. IC Role / Device Role / Timing Role: Battery-backed memory ensuring HIPAA-compliant audit trails and configuration persistence across battery swaps and firmware updates. Use Value: Meets IEC 62304 Class C software safety requirements via deterministic, hardware-enforced write protection below 2.8V. |
| Avionics Black Box Memory | Energy Meter Firmware Parameter Storage |
Use Scenario: Capturing flight-critical telemetry and fault records in airborne data acquisition units where EMI and thermal cycling demand robust, long-life memory. IC Role / Device Role / Timing Role: Self-contained NV SRAM with -40°C to +85°C IND rating and internal lithium source, operating independently of aircraft power bus transients. Use Value: Provides tamper-resistant, timestamped data retention without reliance on external backup batteries or supercapacitors. | Use Scenario: Storing tariff schedules, billing history, and metering constants in ANSI C12.20-certified smart electricity meters deployed in outdoor utility cabinets. IC Role / Device Role / Timing Role: High-reliability memory maintaining accuracy over 15+ year field life despite wide ambient temperature swings and infrequent power interruptions. Use Value: Achieves ANSI/IEEE 1373 compliance for data integrity by guaranteeing 10-year retention without periodic refresh or external supervision. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK12C68 | 5V-only operation; 70ns access time; 2048kb size; no built-in lithium - requires external battery and charge circuitry | Suitable for legacy 5V systems but adds BOM cost and layout complexity for backup power management | Select if existing 5V design prohibits voltage translation and external battery integration is acceptable |
| DS1225AD-100 | Same 3.3V supply; 1024kb size; 100ns access; identical 32-pin DIP package; older generation with lower retention spec (10 years at +25°C only) | Lower density limits use in applications requiring >1Mb NV storage; narrower temperature validation | Consider only for space-constrained retrofits where 1Mb suffices and industrial temp range is not required |
Compared with STK12C68 and DS1225AD-100, DS1249W-150 delivers higher density, integrated lithium with freshness seal, and full industrial temperature validation - reducing system-level design risk and component count while extending field life assurance.
Availability
DS1249W-150 is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, avionics data recorders, and smart utility metering requiring stable component supply and long-term lifecycle support.
Supply support for DS1249W-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 applications.
The DS1249W-150 belongs to Maxim's nonvolatile SRAM product line, engineered specifically for mission-critical systems needing zero-software, hardware-guaranteed data retention during power failure.
FAQ
What is the guaranteed data retention period for DS1249W-150 without external power?
The DS1249W-150 guarantees a minimum of 10 years of data retention in the absence of external power, measured cumulatively from the time VCC is first applied and the internal lithium cell is activated. This specification is validated across the full industrial temperature range (-40°C to +85°C) and assumes proper handling per the freshness seal protocol.
Does DS1249W-150 require external support components for battery backup operation?
No, DS1249W-150 requires no external support components. Its integrated lithium energy source and voltage-monitoring circuitry operate autonomously: the battery remains electrically disconnected until first power-up, then automatically engages during VCC decay below ~2.5V. No external capacitors, regulators, or charge controllers are needed for functional backup.
What is the meaning of the "-150" suffix in DS1249W-150?
The "-150" suffix in DS1249W-150 is a documentation artifact from earlier revision history; per the latest Maxim datasheet (Rev 11/10), this speed grade was removed from ordering. The DS1249W-150 is functionally identical to DS1249W-100, with 100ns access time and full compatibility - the "-150" reflects legacy nomenclature retained for traceability in certain distribution channels.
Can DS1249W-150 be used in a 5V system?
No, DS1249W-150 is strictly a 3.3V device with absolute maximum VCC of +3.6V. Applying 5V will exceed its voltage rating and cause permanent damage. For 5V systems, consider alternatives like STK12C68 or DS1248, which are rated for 5V operation and include appropriate backup circuitry requirements.
How does DS1249W-150 handle simultaneous CE and WE transitions during write cycles?
DS1249W-150 defines precise timing behavior for simultaneous CE/WE edges: if CE goes low simultaneously with or after WE, outputs remain high-impedance during the transition; if CE goes high before or with WE, outputs stay high-Z. These rules prevent bus contention and ensure deterministic write latching based on the later-occurring active edge and earlier-occurring inactive edge.
DS1249W-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:
- 2Mbit
- Memory Organization:
- 256K 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
DS1249W-150 FAQ
1.How can I place an order for DS1249W-150 through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1249W-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 DS1249W-150 reliable?
The price and inventory of DS1249W-150 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1249W-150 is usually 5 days.
3.What payment methods are accepted for DS1249W-150?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1249W-150 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1249W-150?
DS1249W-150 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1249W-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 DS1249W-150?
For technical support, including DS1249W-150 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1249W-150 requirements.
6.How does Aetrix verify that DS1249W-150 is sourced from the original manufacturer or authorized distributors?
All DS1249W-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 DS1249W-150 meets industry standards.
7.What is the process for return or replacement of DS1249W-150?
All DS1249W-150 units undergo pre-shipment inspection (PSI). If there is an issue with DS1249W-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 DS1249W-150 part is unused and in its original packaging.
Return procedure for DS1249W-150:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS1249W-150 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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