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Analog Devices Inc./Maxim Integrated DS1250WP-100IND+
- Part No.:
- DS1250WP-100IND+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- 34-PowerCap™ Module
- Datasheet:
-
DS1250WP-100IND+.pdf
- Description:
- IC NVSRAM 4MBIT PAR 34PWRCAP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
DS1250WP-100IND+ from Maxim Integrated is a 4,194,304-bit (524,288 × 8) nonvolatile SRAM with integrated lithium backup, 100ns read/write access time, 3.3V supply, industrial temperature range (–40°C to +85°C), and PowerCap Module (34-pin) packaging. It replaces volatile SRAM, EEPROM, or Flash in mission-critical data logging and real-time control systems where power loss protection is essential.
For engineers reviewing the DS1250WP-100IND+ datasheet, DS1250WP-100IND+ pinout, DS1250WP-100IND+ application, or DS1250WP-100IND+ equivalent, key selection criteria include guaranteed 10-year data retention without external power, automatic write protection during VCC decay below 2.8V, JEDEC-compatible 34-pin PCM surface-mount footprint, and compatibility with standard microprocessor bus interfaces requiring byte-wide 8-bit data access.
Technical Context
The DS1250WP-100IND+ implements a self-contained nonvolatile memory architecture combining static RAM core, lithium battery switching circuitry, and voltage-monitoring logic. It operates as a drop-in replacement for 512k×8 SRAMs but adds autonomous power-fail detection, seamless battery switchover at ~2.5V, and full write-protection activation before VCC drops below 2.8V.
Its interface uses standard asynchronous parallel bus signals-CE, WE, OE, A0–A18, DQ0–DQ7-with timing fully compliant with 100ns cycle requirements. The PowerCap Module (PCM) separates SRAM base and removable lithium PowerCap (DS9034PCI+), enabling reflow-safe assembly and field-replaceable battery maintenance without PCB rework.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4,194,304 bits (524,288 words × 8 bits) - supports direct replacement of 512k×8 SRAMs in legacy designs. |
| Access Time | 100 ns - enables integration into high-speed 33 MHz microprocessor buses without wait states. |
| Supply Voltage | 3.3 V ±0.3 V - compatible with modern low-voltage digital systems and eliminates need for level-shifting. |
| Data Retention | 10 years minimum without external power - ensures long-term data integrity in unpowered storage or infrequent-access applications. |
| Operating Temp | –40°C to +85°C - certified for industrial environments including factory automation, transportation, and outdoor infrastructure. |
| Write Cycles | Unlimited - removes endurance limitations of EEPROM/Flash, enabling continuous logging or counter applications. |
| Write Protect Threshold | 2.8 V to 3.0 V - triggers automatic hardware lockout before data corruption occurs during brownout conditions. |
Pinout & Package
The DS1250WP-100IND+ is supplied in a 34-pin PowerCap Module (PCM) package, designed for surface-mount assembly with snap-on DS9034PCI+ lithium PowerCap. The module base contains all SRAM and control circuitry; the PowerCap provides the battery and connects via standardized contacts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 524,288-word addressing; compatible with standard microprocessor address lines. |
| DQ0–DQ7 | Data I/O | 8-bit bidirectional data bus; high-impedance outputs when CE or OE inactive, preventing bus contention. |
| CE | Chip Enable | Active-low chip select; initiates read/write cycles only when low; used with WE/OE to define bus timing windows. |
| WE | Write Enable | Active-low write strobe; falling edge (with CE low) starts write; rising edge terminates write cycle. |
| OE | Output Enable | Active-low output enable; controls data bus drivers independently of CE/WE for flexible bus sharing. |
| VCC | Power Supply | +3.3 V main supply; powers SRAM core and control logic; monitored continuously for fail-detection. |
| GND | Ground | Reference return path for all signals and internal circuitry; must be low-impedance for stable retention behavior. |
| VBAT | Battery Terminal | Connects to lithium source in DS9034PCI+ PowerCap; electrically isolated until first VCC application to preserve battery freshness. |
Key Features
| Feature | Design Value |
|---|---|
| Lithium Freshness Seal | Lithium energy source remains electrically disconnected until first VCC >3.0 V application, preserving full 10-year capacity from shipment date. |
| Automatic Power-Fail Response | Monitors VCC continuously; switches to battery and enables write protection within 1.5 µs of detecting out-of-tolerance condition. |
| Standardized PCM Interface | 34-pin surface-mount base accepts DS9034PCI+ PowerCap via keyed mechanical snap-on-no soldering required for battery replacement. |
| No External Support Circuitry | Integrates voltage monitoring, battery switching, and write protection logic on-die-eliminates discrete supervisor ICs and external capacitors. |
| JEDEC-Compatible Pinout | Shares signal mapping and timing with industry-standard 512k×8 SRAMs, enabling drop-in replacement in existing 32-pin DIP layouts (via adapter or redesign). |
Applications
| Industrial Data Logger | Medical Device Memory Backup |
|---|---|
Use Scenario: Continuous recording of sensor readings (temperature, pressure, flow) in factory-floor PLCs where mains power may be interrupted. IC Role / Device Role / Timing Role: Nonvolatile SRAM storing last-known operational state and buffered logs during unexpected AC loss or scheduled shutdown. Use Value: Guarantees zero data loss across power cycles; 10-year retention enables multi-year deployment without battery service. | Use Scenario: Storing calibration coefficients, patient treatment history, and device configuration in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Primary working memory with fail-safe backup-retains critical therapy parameters even if main battery depletes mid-use. Use Value: Meets IEC 62304 safety requirements for data integrity; eliminates need for EEPROM wear-leveling or Flash erase delays. |
| Avionics Black Box Recorder | Railway Signaling Controller |
Use Scenario: Capturing flight control inputs, sensor telemetry, and system status in aircraft crash survivable recorders operating under extreme thermal and vibration stress. IC Role / Device Role / Timing Role: High-reliability nonvolatile buffer interfacing directly with ARINC 429 or MIL-STD-1553 bus controllers. Use Value: Industrial temperature rating (–40°C to +85°C) and 100ns access ensure deterministic response in real-time avionics subsystems. | Use Scenario: Maintaining interlocking logic state and train position history in wayside signaling cabinets exposed to wide ambient swings and EMI-rich rail corridors. IC Role / Device Role / Timing Role: Fault-tolerant memory element in SIL-4-certified safety controllers, retaining safe state during grid fluctuations or lightning-induced transients. Use Value: Automatic write protection at 2.8V prevents corruption during brownouts common in track-side power distribution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS1250W-100IND+ | 32-pin EDIP package; integrated battery; wave/hand-solder only; no field-replaceable battery. | Suitable for through-hole legacy designs or space-constrained modules where reflow is not used. | Select when board layout prohibits surface-mount or when simplified single-package integration outweighs field-serviceability needs. |
| STK14C88-3A50I | 3.3V, 512k×8 NV SRAM; 50ns access; 32-pin SOIC; integrated Li battery; no PCM option. | Higher speed but narrower temperature range (–40°C to +85°C same); lacks detachable PowerCap for battery replacement. | Select when faster access is critical and battery lifetime is managed via full-module replacement rather than field swap. |
Compared with DS1250W-100IND+ and STK14C88-3A50I, the DS1250WP-100IND+ uniquely combines industrial temperature support, 100ns timing, and field-replaceable lithium backup via its 34-pin PCM architecture-enabling long-life deployments where maintenance access is limited but reliability is non-negotiable.
Availability
DS1250WP-100IND+ is available at Aetrix Electronics and suitable for industrial data loggers, medical device memory backup, avionics black box recorders, and railway signaling controllers requiring stable component supply across extended product lifecycles.
Supply support for DS1250WP-100IND+ 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 solutions for industrial, automotive, communications, and computing markets.
The DS1250WP-100IND+ belongs to Maxim's nonvolatile SRAM product line, engineered specifically for applications demanding guaranteed data retention during unpredictable power loss-targeting industrial control, medical instrumentation, and transportation systems where firmware or configuration integrity is safety-critical.
FAQ
What is the primary function of the DS1250WP-100IND+ in a system?
The DS1250WP-100IND+ serves as a nonvolatile SRAM that retains data without external power by automatically switching to an onboard lithium battery during power failure. Its role is to replace volatile memory in systems where uninterrupted data integrity is mandatory-such as industrial controllers or medical devices-and it does so while maintaining full 100ns read/write performance and pin compatibility with standard 512k×8 SRAMs. The DS1250WP-100IND+ integrates all necessary supervision logic, eliminating external components.
Does the DS1250WP-100IND+ require external circuitry for battery management?
No, the DS1250WP-100IND+ requires no external circuitry for battery management. It includes on-chip voltage monitoring, automatic lithium battery switchover at ~2.5V, and hardware write protection activation below 2.8V. The lithium source remains disconnected until first application of VCC >3.0V, preserving shelf life. All control logic-including power-fail detection, battery isolation, and data lock-is fully integrated, making the DS1250WP-100IND+ a self-contained solution.
How does the PowerCap Module (PCM) design of the DS1250WP-100IND+ improve manufacturability?
The DS1250WP-100IND+ uses a two-part PowerCap Module: a surface-mount SRAM base and a snap-on DS9034PCI+ PowerCap containing the lithium battery. This allows the base to undergo standard reflow soldering without exposing the battery to destructive temperatures. After assembly, the PowerCap is mechanically attached-enabling field replacement without PCB rework. This design directly addresses manufacturing constraints that limit use of integrated-battery DIP packages in SMT lines, making the DS1250WP-100IND+ viable for high-volume automated production.
What is the significance of the "IND" suffix in DS1250WP-100IND+?
The "IND" suffix in DS1250WP-100IND+ denotes qualification for the industrial temperature range of –40°C to +85°C, verified across all electrical and timing specifications-including 100ns access time, 2.8V write-protection threshold, and 10-year data retention. This rating ensures reliable operation in harsh environments such as factory floors, outdoor telecom cabinets, and rail infrastructure, where ambient extremes and thermal cycling would degrade commercial-grade alternatives. The DS1250WP-100IND+ maintains full functionality across this range without derating.
Can the DS1250WP-100IND+ be used as a direct replacement for standard 512k×8 SRAMs?
Yes-the DS1250WP-100IND+ is designed as a functional and timing-compatible replacement for 512k×8 volatile SRAMs, with identical 8-bit data bus, 19-bit address bus, and standard CE/WE/OE control protocol. While its 34-pin PCM footprint differs physically from 32-pin DIP, its signal mapping matches JEDEC-standard byte-wide SRAMs. System-level integration requires only minor layout adaptation for the PCM form factor and connection to the DS9034PCI+ PowerCap-but no changes to firmware, timing logic, or bus interface design are needed for the DS1250WP-100IND+.
DS1250WP-100IND+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 34-PowerCap™ Module
- Packaging:
- Tray
- 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:
- 100ns
- Access Time:
- 100 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 34-PowerCap Module
DS1250WP-100IND+ FAQ
1.How can I place an order for DS1250WP-100IND+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1250WP-100IND+ 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 DS1250WP-100IND+ reliable?
The price and inventory of DS1250WP-100IND+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1250WP-100IND+ is usually 5 days.
3.What payment methods are accepted for DS1250WP-100IND+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1250WP-100IND+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1250WP-100IND+?
DS1250WP-100IND+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1250WP-100IND+ 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 DS1250WP-100IND+?
For technical support, including DS1250WP-100IND+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1250WP-100IND+ requirements.
6.How does Aetrix verify that DS1250WP-100IND+ is sourced from the original manufacturer or authorized distributors?
All DS1250WP-100IND+ 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 DS1250WP-100IND+ meets industry standards.
7.What is the process for return or replacement of DS1250WP-100IND+?
All DS1250WP-100IND+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1250WP-100IND+, 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 DS1250WP-100IND+ part is unused and in its original packaging.
Return procedure for DS1250WP-100IND+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS1250WP-100IND+ Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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AT24C04C-SSHM-T
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AT24C08C-STUM-T
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