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Analog Devices Inc./Maxim Integrated DS1245WP-150+
- Part No.:
- DS1245WP-150+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- 34-PowerCap™ Module
- Datasheet:
-
DS1245WP-150+.pdf
- Description:
- IC NVSRAM 1MBIT PAR 34PWRCAP
- Quantity:
- Payment:
- Shipping:
Inventory:2,830
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Product details
Overview
DS1245WP-150+ from Maxim Integrated is a 3.3V, 1024k-bit (131,072 × 8) nonvolatile static RAM with integrated lithium backup, JEDEC-standard 34-pin PowerCap Module (PCM) package, 100ns read/write access time, and industrial-grade -40°C to +85°C operation. It replaces volatile SRAM, EEPROM, or Flash in battery-backed memory applications requiring data retention during power loss.
For engineers reviewing the DS1245WP-150+ datasheet, DS1245WP-150+ pinout, DS1245WP-150+ application, or DS1245WP-150+ equivalent, key selection criteria include nonvolatile write protection threshold (2.8V), unlimited write cycles, automatic VCC-fail detection (<1.5µs response), surface-mount compatibility without reflow exposure to lithium, and standardized PCM pinout for drop-in replacement across Maxim's NV SRAM family.
Technical Context
The DS1245WP-150+ integrates SRAM, lithium battery, and autonomous power-fail control circuitry into a modular base that mates with DS9034PC+ or DS9034PCI+ snap-on PowerCap. Its internal voltage monitor triggers write protection when VCC falls below 2.8V and switches to battery power within 1.5µs, ensuring zero-cycle data corruption.
It operates as a byte-wide parallel memory with full static timing: CE/WE/OE-controlled read/write cycles, 100ns tACC/tWC, and high-impedance outputs during deselect or write. The PCM architecture isolates the lithium cell from reflow soldering by separating module base (surface-mountable) and PowerCap (mechanically attached post-reflow).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1,048,576 bits (131,072 × 8), enabling direct replacement of 128k×8 volatile SRAM without address decoding changes. |
| Access Time | 100ns tACC and tWC - supports high-speed microprocessor bus interfacing at up to 10 MHz sustained throughput. |
| Write Protection Threshold | 2.8V to 3.0V VTP - guarantees deterministic, glitch-free switch to battery backup before VCC drops below functional SRAM supply minimum (3.0V). |
| Data Retention | 10 years minimum in battery-backup mode - verified under continuous absence of VCC after first power-up, with lithium source electrically disconnected until initial VCC application. |
| Operating Voltage | 3.0V to 3.6V VCC - compatible with standard 3.3V logic systems and tolerant of ±0.3V supply variation. |
| Temperature Range | -40°C to +85°C - qualified for industrial environments including factory automation, instrumentation, and telecom infrastructure. |
| Package Type | 34-pin PowerCap Module (PCM) - surface-mountable base with keyed mechanical interface for DS9034PC+ PowerCap; avoids thermal damage to lithium during reflow. |
Pinout & Package
The DS1245WP-150+ uses a 34-pin PowerCap Module (PCM) package: a surface-mountable module base with contacts for mating to DS9034PC+ or DS9034PCI+, enabling lithium isolation during PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 131,072-word addressing; TTL-compatible inputs with 0.4V/2.2V logic thresholds. |
| DQ0–DQ7 | Data I/O | Bi-directional 8-bit data bus; outputs enter high-impedance state when CE or OE is inactive, preventing bus contention. |
| CE | Chip Enable | Active-low chip select; initiates read/write when low and synchronizes with WE/OE to define cycle type and timing boundaries. |
| WE | Write Enable | Active-low write control; falling edge (with CE low) starts write cycle; rising edge terminates it; disables outputs within 35ns (tODW). |
| OE | Output Enable | Active-low output control; enables data drivers only during reads; must be high during writes to avoid contention. |
| VCC | Power Supply | +3.3V primary supply; powers SRAM and control logic; monitored continuously for fail detection and automatic battery switchover. |
| GND | Ground | Reference return path for all signals and power; required for stable operation and accurate voltage threshold detection. |
| VBAT | Lithium Backup Terminal | Connects to DS9034PC+ PowerCap; isolated from VCC until first power-up, preserving full battery capacity for 10-year retention. |
| NC | No Connect | Unbonded pins (pins 1, 2, 33, 34); no internal connection; must remain unconnected on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-Fail Response | Detects VCC decay below 2.8V and switches to lithium backup within 1.5µs, disabling writes and placing all I/O in safe high-Z state. |
| Freshness Seal | Lithium energy source remains electrically disconnected until first VCC application >3.0V, guaranteeing full 10-year retention capacity from shipment. |
| Surface-Mountable PCM Architecture | Module base withstands 260°C reflow; DS9034PC+ PowerCap snaps on post-assembly, eliminating thermal stress on lithium cell. |
| Standardized Pinout | 34-pin PCM layout matches Maxim's nonvolatile SRAM family, enabling hardware reuse across densities and speed grades without layout change. |
| Unlimited Write Cycles | No endurance limit on SRAM writes - eliminates wear-leveling firmware overhead and supports real-time logging applications. |
Applications
| Industrial Data Logger | Telecom Base Station Control |
|---|---|
Use Scenario: Continuous timestamped sensor readings stored during mains failure and recovered on reboot. IC Role / Device Role / Timing Role: Nonvolatile SRAM buffer holding critical operational logs and configuration state between power cycles. Use Value: Guarantees zero-data-loss logging with 10-year retention and 100ns access for real-time capture at 10MHz bus rates. | Use Scenario: Storing boot firmware, calibration tables, and alarm history in cellular infrastructure equipment operating in remote cabinets. IC Role / Device Role / Timing Role: Battery-backed memory retaining configuration integrity during grid fluctuations or battery-swaps. Use Value: Eliminates need for external backup controllers or EEPROM wear management; operates reliably from -40°C to +85°C without derating. |
| Medical Diagnostic Equipment | Factory Automation PLC |
Use Scenario: Preserving patient session data, calibration offsets, and fault logs during emergency shutdown or transport. IC Role / Device Role / Timing Role: Fail-safe memory storing mission-critical runtime parameters with deterministic power-loss response. Use Value: Meets IEC 62304 safety requirements via sub-µs VCC-fail detection and automatic write-protection activation. | Use Scenario: Holding ladder logic state, I/O mapping, and production counters across unexpected line interruptions in robotic cells. IC Role / Device Role / Timing Role: Real-time nonvolatile storage synchronized to PLC scan cycles without software intervention. Use Value: Enables seamless recovery within one scan cycle; supports unlimited writes for high-frequency counter updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS1245W-150IND+ | 32-pin JEDEC DIP package; integrated lithium; same 1024k density, 100ns speed, and -40°C to +85°C rating. | Through-hole mounting; no separate PowerCap required; not surface-mountable; unsuitable for automated SMT lines. | Select for legacy board upgrades or hand-soldered prototypes where DIP footprint is retained. |
| STK12C68-E25I | 128k × 8 (1Mbit) nvSRAM; 25ns access; 5V operation; SOIC-32 package; no PCM option. | Higher speed but lower density; incompatible voltage domain; lacks industrial PCM modularity and freshness seal. | Select only if 5V system compatibility and <25ns timing are mandatory; requires redesign for voltage translation and layout. |
Compared with DS1245W-150IND+ and STK12C68-E25I, the DS1245WP-150+ uniquely combines industrial temperature range, surface-mount readiness, modular lithium integration, and guaranteed 10-year retention - making it the sole choice for new SMT-based industrial designs requiring zero-layout-change scalability across Maxim's nvSRAM portfolio.
Availability
DS1245WP-150+ is available at Aetrix Electronics and suitable for industrial data loggers, telecom base station control units, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for DS1245WP-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 nonvolatile memory solutions for industrial, automotive, and communications markets.
The DS1245WP-150+ belongs to Maxim's nonvolatile SRAM product line, engineered specifically for applications demanding deterministic power-loss immunity, extended data retention, and surface-mount manufacturability without compromising lithium cell integrity.
FAQ
What is the guaranteed data retention period for DS1245WP-150+ in battery-backup mode?
The DS1245WP-150+ guarantees a minimum of 10 years of data retention in the absence of external power, measured from the time VCC is first applied - thanks to its freshness-sealed lithium energy source that remains electrically disconnected until initial power-up. This specification is validated under worst-case industrial temperature conditions (-40°C to +85°C) and accounts for cumulative backup time only.
Does DS1245WP-150+ require external support circuitry for microprocessor interfacing?
No, the DS1245WP-150+ requires no external support circuitry for microprocessor interfacing. Its fully static design, TTL-compatible control signals (CE, WE, OE), and built-in power-fail monitoring eliminate the need for external supervisors, backup controllers, or write-protection logic. The DS1245WP-150+ handles all nonvolatile functions autonomously, including lithium switching and write disable.
How does the PowerCap Module (PCM) architecture of DS1245WP-150+ protect the lithium battery during PCB assembly?
The DS1245WP-150+ separates the SRAM/control module base (reflow-solderable at 260°C) from the lithium-containing DS9034PC+ PowerCap, which is snapped on mechanically after reflow. This ensures the lithium cell never experiences thermal stress, preserving its capacity and safety certification. The keyed PCM interface prevents misalignment and guarantees reliable electrical contact without soldering.
What is the write protection voltage threshold for DS1245WP-150+, and how quickly does it activate?
The DS1245WP-150+ activates write protection when VCC falls below 2.8V (typical 2.9V), with guaranteed response within 1.5µs (tPD). During this transition, all inputs become "don't care," outputs go high-impedance, and the lithium source is connected to retain data - preventing any partial or corrupted writes during brownout conditions.
Is DS1245WP-150+ pin-compatible with other Maxim nonvolatile SRAMs in the PCM package family?
Yes, the DS1245WP-150+ uses Maxim's standardized 34-pin PCM pinout, ensuring mechanical and electrical compatibility across the DS12xxW PCM family (e.g., DS1225, DS1230). This allows direct substitution of different densities or speed grades on the same PCB footprint, provided the host system supports the required address/data bus width and timing.
DS1245WP-150+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 34-PowerCap™ Module
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 150ns
- Access Time:
- 150 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 34-PowerCap Module
DS1245WP-150+ FAQ
1.How can I place an order for DS1245WP-150+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1245WP-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 DS1245WP-150+ reliable?
The price and inventory of DS1245WP-150+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1245WP-150+ is usually 5 days.
3.What payment methods are accepted for DS1245WP-150+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1245WP-150+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1245WP-150+?
DS1245WP-150+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1245WP-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 DS1245WP-150+?
For technical support, including DS1245WP-150+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1245WP-150+ requirements.
6.How does Aetrix verify that DS1245WP-150+ is sourced from the original manufacturer or authorized distributors?
All DS1245WP-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 DS1245WP-150+ meets industry standards.
7.What is the process for return or replacement of DS1245WP-150+?
All DS1245WP-150+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1245WP-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 DS1245WP-150+ part is unused and in its original packaging.
Return procedure for DS1245WP-150+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS1245WP-150+ Tags
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