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Analog Devices Inc./Maxim Integrated DS1245WP-100IND+
- Part No.:
- DS1245WP-100IND+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- 34-PowerCap™ Module
- Datasheet:
-
DS1245WP-100IND+.pdf
- Description:
- IC NVSRAM 1MBIT PAR 34PWRCAP
- Quantity:
- Payment:
- Shipping:
Inventory:1,823
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Product details
Overview
DS1245WP-100IND+ from Maxim Integrated is a 1024k-bit (131,072 × 8) nonvolatile SRAM with integrated lithium backup, industrial temperature rating (–40°C to +85°C), 100 ns read/write access time, and JEDEC-standard 34-pin PowerCap Module (PCM) package. It replaces volatile SRAM, EEPROM, or Flash in systems requiring automatic data retention during power loss - such as industrial PLCs, medical data loggers, and telecom base station configuration storage.
For engineers reviewing the DS1245WP-100IND+ datasheet, DS1245WP-100IND+ pinout, DS1245WP-100IND+ application, or DS1245WP-100IND+ equivalent, key selection criteria include guaranteed 10-year data retention without external power, automatic write protection at VCC < 2.8 V, unlimited write cycles, low-power CMOS operation, and compatibility with standard microprocessor bus interfaces.
Technical Context
The DS1245WP-100IND+ integrates static RAM, lithium battery, and power-fail detection circuitry into a single surface-mountable module. Its control logic monitors VCC continuously and switches to battery backup within 1.5 µs when voltage drops below 2.8 V, disabling writes and placing outputs in high-Z state.
It operates fully at 3.3 V ±0.3 V across –40°C to +85°C, supports asynchronous parallel interface with CE/WE/OE controls, and requires no external support circuitry for nonvolatility - eliminating need for external supervisors, backup capacitors, or write-protection logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1,048,576 bits (131,072 × 8), enabling byte-wide microprocessor interfacing without address multiplexing |
| Access Time | 100 ns max read/write cycle time - meets timing requirements of 10 MHz bus systems |
| Data Retention | 10 years minimum without external power - verified under industrial temperature stress conditions |
| Write Protection Threshold | VTP = 2.8–3.0 V - triggers automatic hardware write lock before VCC falls to unreliable levels |
| Supply Voltage | 3.0 V to 3.6 V - compatible with modern 3.3 V logic families and tolerant of typical rail droop |
| Standby Current | 30–250 µA - enables ultra-low-power retention in battery-backed systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, transportation, and outdoor infrastructure |
Pinout & Package
DS1245WP-100IND+ uses a 34-pin PowerCap Module (PCM) package: a surface-mount base with standardized contacts for snap-on DS9034PCI+ PowerCap. The PCM design isolates the lithium cell from reflow soldering temperatures (up to +260°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 131,072-word addressing; TTL-compatible inputs |
| DQ0–DQ7 | Data I/O | Bi-directional 8-bit data bus with 2 mA drive strength and 5–10 pF capacitance |
| CE | Chip Enable | Active-low chip select; initiates read/write when low with WE/OE asserted appropriately |
| WE | Write Enable | Active-low write strobe; falling edge defines write start; must be high ≥5 ns before next cycle |
| OE | Output Enable | Active-low output control; enables data drivers only during reads; high during writes prevents bus contention |
| VCC | Power Supply | +3.3 V primary supply; powers SRAM and control logic; disconnects battery when >2.5 V |
| GND | Ground | Reference return path for all signals and internal circuitry |
| VBAT | Battery Terminal | Direct connection to DS9034PCI+ lithium cell; electrically isolated until first VCC application |
| NC | No Connect | Unused pins (pins 1, 2, 33, 34); must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-Fail Switching | Switches to lithium backup within 1.5 µs at VCC < 2.8 V - prevents data corruption during brownouts |
| Freshness Seal | Lithium source remains electrically disconnected until first VCC application - preserves full 10-year capacity |
| Unlimited Write Cycles | No endurance limit on SRAM writes - eliminates wear-leveling firmware overhead required by Flash/EEPROM |
| Standardized PCM Pinout | Same footprint and signal mapping across Maxim's NV SRAM family - simplifies migration and BOM consolidation |
| High-Z Output During Power Loss | All DQ lines go high-impedance automatically when VCC drops - avoids bus contention in multi-device systems |
Applications
| Industrial Data Logging | Telecom Configuration Storage |
|---|---|
Use Scenario: Continuous recording of sensor readings, fault events, or operational parameters in programmable logic controllers (PLCs) deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile SRAM serving as real-time data buffer and persistent configuration store - retains critical state during unexpected AC mains failure or scheduled maintenance shutdowns. Use Value: Eliminates need for external battery-backed RAM controllers or EEPROM write-delay logic, reducing bill-of-materials and firmware complexity while guaranteeing 10-year retention at –40°C to +85°C. | Use Scenario: Storing boot images, provisioning keys, and network settings in cellular base station remote radio units (RRUs) exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary nonvolatile memory for field-upgradable configuration data - accessed directly via processor's parallel bus during boot and runtime parameter updates. Use Value: Enables zero-latency read/write access (100 ns) and unlimited rewrites without degradation - critical for frequent OTA configuration changes and secure key rotation. |
| Medical Diagnostic Equipment | Avionics Maintenance Records |
Use Scenario: Capturing and preserving calibration coefficients, patient session logs, and diagnostic timestamps in portable ultrasound or ECG devices requiring FDA-compliant data integrity. IC Role / Device Role / Timing Role: Fail-safe memory holding time-critical clinical data during battery swaps or AC adapter disconnection - powered exclusively by internal lithium during gaps. Use Value: Meets IEC 62304 software safety requirements by eliminating software-managed write-protection schemes - hardware-enforced write lock activates autonomously at 2.8 V. | Use Scenario: Recording flight-hour metrics, system fault codes, and maintenance history in airborne flight data recorders (FDRs) operating in pressurized cabin environments. IC Role / Device Role / Timing Role: Tamper-resistant, long-life memory storing mission-critical airworthiness data - retained across aircraft power-down cycles and extended ground storage. Use Value: Provides UL-recognized (File E99151) reliability and 10-year retention without periodic refresh or external supervision - satisfying DO-160 environmental compliance for avionics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK12C68-55I | 55 ns access time; 5 V supply; 28-pin SOIC; no integrated battery - requires external backup capacitor or battery management IC | Suitable for legacy 5 V systems with tighter timing budgets but lacks autonomous power-fail response | Select only if existing 5 V architecture prohibits 3.3 V migration and board space allows discrete backup components |
| FM24CL64-G | 64 kbit F-RAM; 3.3 V; 8-pin SOIC; 55 ns access; serial I²C interface; no battery required | Lower density and serial interface limit use to low-bandwidth configuration storage - not suitable for high-speed parallel data buffering | Prefer for cost-sensitive, low-pin-count designs where 64 kbit capacity and I²C compatibility outweigh need for 1 Mbit parallel bandwidth |
Compared with STK12C68-55I and FM24CL64-G, DS1245WP-100IND+ delivers higher density (1024 kbit), true hardware-based nonvolatility with zero software intervention, and industrial-grade thermal resilience - making it optimal for parallel-bus systems demanding deterministic power-loss response and long-term data integrity.
Availability
DS1245WP-100IND+ is available at Aetrix Electronics and suitable for industrial data logging, telecom configuration storage, and medical diagnostic equipment requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for DS1245WP-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 ICs for industrial, automotive, and communications markets.
The DS1245W family was designed specifically to eliminate external nonvolatility support circuitry in microprocessor-based systems - delivering plug-and-play data retention through monolithic integration of SRAM, lithium battery, and intelligent power monitoring.
FAQ
What is the guaranteed data retention period for DS1245WP-100IND+ under industrial temperature conditions?
The DS1245WP-100IND+ guarantees a minimum of 10 years of data retention in the absence of external power, validated across its full industrial operating range (–40°C to +85°C). This specification accounts for cumulative time spent in battery-backup mode after first power application, with the internal lithium energy source remaining fresh due to the factory-applied freshness seal.
Does DS1245WP-100IND+ require external circuitry to enable nonvolatile operation?
No, DS1245WP-100IND+ requires no external circuitry for nonvolatile operation. Its integrated power-fail detection, lithium battery, and automatic write-protection logic operate autonomously. The device only needs standard 3.3 V supply, address/data/control signals, and a DS9034PCI+ PowerCap snapped onto the PCM base - no supervisors, capacitors, or firmware intervention are needed.
How does the DS1245WP-100IND+ handle power transitions during active memory access?
During power-down, DS1245WP-100IND+ detects VCC decay below 2.8 V within 1.5 µs, immediately disables writes, places all DQ lines in high-impedance state, and switches to lithium backup. During power-up, it reconnects VCC to the SRAM once voltage exceeds ~2.5 V and resumes normal operation after VCC stabilizes above 3.0 V - ensuring seamless transition without data loss or bus conflict.
Can DS1245WP-100IND+ be used as a drop-in replacement for standard 32-pin DIP nonvolatile SRAMs?
No, DS1245WP-100IND+ uses a 34-pin PowerCap Module (PCM) package and is not pin-compatible with 32-pin DIP devices like DS1245W-100IND+. It is designed for surface-mount assembly with a separate snap-on PowerCap. For DIP-compatible industrial-grade replacement, DS1245W-100IND+ (32-pin EDIP) is the appropriate variant.
What is the role of the VBAT pin on DS1245WP-100IND+?
The VBAT pin on DS1245WP-100IND+ provides the direct electrical interface to the lithium cell inside the DS9034PCI+ PowerCap. It remains isolated from the SRAM until first VCC application, preserving battery capacity. During power loss, VBAT supplies current to retain data - the internal switching circuit ensures no backfeed occurs between VCC and VBAT under normal or fault conditions.
DS1245WP-100IND+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 34-PowerCap™ Module
- Packaging:
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- NVSRAM
- Technology:
- NVSRAM (Non-Volatile SRAM)
- Memory Size:
- 1Mbit
- Memory Organization:
- 128K 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
DS1245WP-100IND+ FAQ
1.How can I place an order for DS1245WP-100IND+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1245WP-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 DS1245WP-100IND+ reliable?
The price and inventory of DS1245WP-100IND+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1245WP-100IND+ is usually 5 days.
3.What payment methods are accepted for DS1245WP-100IND+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1245WP-100IND+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1245WP-100IND+?
DS1245WP-100IND+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1245WP-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 DS1245WP-100IND+?
For technical support, including DS1245WP-100IND+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1245WP-100IND+ requirements.
6.How does Aetrix verify that DS1245WP-100IND+ is sourced from the original manufacturer or authorized distributors?
All DS1245WP-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 DS1245WP-100IND+ meets industry standards.
7.What is the process for return or replacement of DS1245WP-100IND+?
All DS1245WP-100IND+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1245WP-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 DS1245WP-100IND+ part is unused and in its original packaging.
Return procedure for DS1245WP-100IND+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS1245WP-100IND+ Tags
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