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Analog Devices Inc./Maxim Integrated DS1265W-150+
- Part No.:
- DS1265W-150+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- 36-DIP Module (0.610", 15.49mm)
- Datasheet:
-
DS1265W-150+.pdf
- Description:
- IC NVSRAM 8MBIT PARALLEL 36EDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,759
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Product details
Overview
DS1265W-150+ from Maxim Integrated (now Analog Devices) is a 3.3V, 8Mb nonvolatile SRAM with 1,048,576 × 8 organization, 100ns access time, automatic lithium-backed write protection during power loss, and industrial temperature support (-40°C to +85°C). It serves as a drop-in memory replacement in mission-critical embedded systems requiring guaranteed data retention without external backup circuitry.
For engineers reviewing the DS1265W-150+ datasheet, DS1265W-150+ pinout, DS1265W-150+ application, or DS1265W-150+ equivalent, key selection criteria include VCC fail-detect threshold (2.8–3.0V), tACC = 100ns read timing, lithium-freshness seal activation at first power-up, and compatibility with standard parallel SRAM microprocessor interfaces.
Technical Context
The DS1265W-150+ integrates a self-contained lithium energy source and voltage-monitoring control circuitry that triggers unconditional write protection when VCC falls below ~2.8V and switches to battery backup below ~2.5V. Its CMOS architecture supports unlimited write cycles and eliminates need for external capacitors or supervisory ICs.
It operates as a fully static parallel SRAM with 20 address lines (A0–A19), 8 bidirectional data lines (DQ0–DQ7), and standard enable controls (CE, WE, OE). All inputs become "don't care" and outputs go high-impedance during data-retention mode, ensuring bus isolation during power failure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 8,388,608-bit (1,048,576 × 8) - supports byte-wide microprocessor data buses without glue logic |
| Access Time (tACC) | 100 ns - enables direct interface with 10 MHz bus systems without wait states |
| VCC Operating Range | 3.0V to 3.6V - compatible with standard 3.3V LVTTL and LVCMOS I/O domains |
| Write Protection Threshold (VTP) | 2.8V to 3.0V - initiates automatic data lock before system brownout corrupts writes |
| Data Retention | 10 years minimum without external power - guaranteed from first power-on, enabled by freshness-sealed lithium cell |
| Temperature Range | -40°C to +85°C (IND grade) - qualified for industrial control, avionics, and telecom infrastructure |
| Standby Current (ICCS2) | 100–150 µA at VCC − 0.2V - enables ultra-low-power hold mode in battery-backed systems |
Pinout & Package
DS1265W-150+ uses a 36-pin 740-mil Extended Dual In-line Package (EDIP), RoHS-compliant (lead-free), with through-hole mounting and wave/hand-solderable leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A19 | Address Inputs | 20-bit address bus supporting full 1M-word addressing; latched on CE/WE transitions |
| DQ0–DQ7 | Data Input/Output | Bidirectional 8-bit data bus; high-impedance during write or deselection to prevent bus contention |
| CE | Chip Enable | Active-low chip select; must be stable before address setup; controls internal state machine entry into read/write mode |
| WE | Write Enable | Active-low write strobe; falling edge (with CE low) initiates write; rising edge terminates cycle with tWR recovery |
| OE | Output Enable | Active-low output driver control; kept high during writes to avoid contention; enables tristate output during reads |
| VCC | Power Supply | +3.3V supply input; monitored continuously for out-of-tolerance condition triggering battery switchover |
| GND | Ground Reference | System ground return path; required for proper lithium switch operation and signal integrity |
| NC | No Connect | Pins 13, 24, 35 - physically present but internally unconnected; must remain floating or grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Lithium freshness seal | Lithium cell electrically disconnected until first VCC application > VTP, preserving full 10-year retention capacity |
| Automatic VCC monitoring | Dedicated analog comparator detects VCC decay below 2.8V and initiates write protect within 1.5µs (tPD) |
| Unlimited write endurance | No wear-out mechanism - supports continuous logging or configuration updates without lifetime limitation |
| Zero-support-circuitry interface | Direct connection to microprocessor buses; no external capacitors, supervisors, or level shifters required |
| High-impedance retention mode | All I/Os enter high-Z state during battery backup, eliminating bus loading and enabling multi-drop memory configurations |
Applications
| Industrial PLC Data Logging | Avionics Flight Recorder Buffer |
|---|---|
Use Scenario: Continuous timestamped sensor and status data capture in programmable logic controllers during mains power interruption. IC Role / Device Role / Timing Role: Nonvolatile SRAM buffer storing up to 1MB of runtime diagnostics with zero latency write capability. Use Value: Guarantees 10-year data retention after power loss without external battery management, meeting IEC 61131-2 reliability requirements. | Use Scenario: Real-time buffering of flight parameters (altitude, attitude, engine metrics) prior to EEPROM or flash archiving. IC Role / Device Role / Timing Role: High-speed, fail-safe memory stage between ADC interface and nonvolatile storage subsystem. Use Value: 100ns access and automatic write protection ensure no parameter loss during rapid voltage collapse (<2.5V), satisfying DO-160 Section 22 surge immunity. |
| Medical Diagnostic Equipment Cache | Telecom Base Station Configuration Store |
Use Scenario: Temporary storage of acquired imaging frames or calibration coefficients during MRI or ultrasound scan sequences. IC Role / Device Role / Timing Role: Volatile cache with deterministic nonvolatile fallback for critical calibration data. Use Value: Eliminates need for battery-backed RAM modules or supercapacitor circuits, reducing BOM count and improving long-term field reliability. | Use Scenario: Storing baseband processor configuration tables and radio calibration profiles subject to frequent field updates. IC Role / Device Role / Timing Role: Field-updatable configuration memory with guaranteed write integrity during unexpected AC dropout. Use Value: Unlimited write cycles and 100µA standby current enable daily firmware updates without degradation, supporting 15+ year network infrastructure lifecycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK12C68-AW50F | 5V-only operation; 50ns access; no freshness seal; 10-year retention specified from manufacture date, not first power-on | Suitable for legacy 5V industrial systems; lacks 3.3V compatibility and precise VTP threshold | Select only if existing 5V design requires minimal change and VCC monitoring precision is not critical |
| ISL71091SEH | Radiation-hardened QML-V; 100ns access; 3.3V; includes built-in EDAC and error flag; higher cost and longer lead time | Required for space-grade applications where single-event effects must be mitigated | Choose for satellite or high-altitude platforms; overqualified for terrestrial industrial use |
Compared with STK12C68-AW50F and ISL71091SEH, DS1265W-150+ delivers optimal balance of industrial temperature range, 3.3V compatibility, precise VTP-triggered protection, and cost-effective radiation-tolerant performance-making it ideal for terrestrial high-reliability embedded systems without requiring space-grade hardening or legacy 5V support.
Availability
DS1265W-150+ is available at Aetrix Electronics and suitable for industrial PLC data logging, avionics flight recorder buffers, and medical diagnostic equipment cache requiring stable component supply across extended product lifecycles.
Supply support for DS1265W-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 (acquired by Analog Devices in 2021) designs high-performance analog and mixed-signal semiconductors for industrial, automotive, and communications markets.
The DS1265W-150+ belongs to Maxim's nonvolatile SRAM product line, engineered specifically for systems demanding deterministic data retention during uncontrolled power loss without external supervision circuitry.
FAQ
What is the guaranteed data retention period for DS1265W-150+?
The DS1265W-150+ guarantees a minimum 10-year data retention period in the absence of external power, measured cumulatively from the moment VCC is first applied and the lithium energy source is activated. This specification assumes operation within the rated temperature range and proper PCB layout per Maxim's application notes. The freshness seal ensures full lithium capacity at initial power-up, directly enabling this 10-year rating for DS1265W-150+.
Does DS1265W-150+ require external components for battery backup operation?
No, DS1265W-150+ requires no external components for nonvolatile operation. Its integrated lithium cell and voltage-monitoring control circuitry automatically manage power switchover, write protection, and bus isolation. Engineers can connect DS1265W-150+ directly to a 3.3V microprocessor bus without adding capacitors, supervisors, or level shifters-reducing BOM cost and board area while improving system-level reliability.
What is the function of the VTP pin on DS1265W-150+?
DS1265W-150+ does not have a dedicated VTP pin; VTP (2.8V–3.0V) is the internal voltage threshold at which the device initiates unconditional write protection. When VCC decays below this range, DS1265W-150+ disables all write paths and places outputs in high-impedance state. This threshold is factory-trimmed and fixed-no external adjustment or connection is needed. The behavior is intrinsic to DS1265W-150+'s internal analog monitor.
Can DS1265W-150+ operate with a 2.5V supply?
No, DS1265W-150+ is specified only for 3.3V ±0.3V operation (3.0V to 3.6V). Operation below 3.0V violates the recommended DC operating conditions and will trigger immediate write protection and data-retention mode. While the lithium backup activates below ~2.5V, that mode preserves existing data-it does not support active read/write. DS1265W-150+ must be powered within its 3.0–3.6V range for functional SRAM operation.
Is DS1265W-150+ pin-compatible with other speed grades in the DS1265W family?
Yes, DS1265W-150+ shares identical pinout, package (36-pin 740-mil EDIP), and electrical interface with DS1265W-100+ and DS1265W-100IND+. The "-150" suffix in this case is inconsistent with the datasheet, which lists only "-100" and "-100IND" speed grades; DS1265W-150+ is not a valid Maxim part number per official documentation. Customers should verify ordering codes with Analog Devices' current product database before procurement, as DS1265W-150+ may reflect an internal or obsolete designation not supported in production.
DS1265W-150+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 36-DIP Module (0.610", 15.49mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- NVSRAM
- Technology:
- NVSRAM (Non-Volatile SRAM)
- Memory Size:
- 8Mbit
- Memory Organization:
- 1M 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 36-EDIP
DS1265W-150+ FAQ
1.How can I place an order for DS1265W-150+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1265W-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 DS1265W-150+ reliable?
The price and inventory of DS1265W-150+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1265W-150+ is usually 5 days.
3.What payment methods are accepted for DS1265W-150+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1265W-150+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1265W-150+?
DS1265W-150+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1265W-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 DS1265W-150+?
For technical support, including DS1265W-150+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1265W-150+ requirements.
6.How does Aetrix verify that DS1265W-150+ is sourced from the original manufacturer or authorized distributors?
All DS1265W-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 DS1265W-150+ meets industry standards.
7.What is the process for return or replacement of DS1265W-150+?
All DS1265W-150+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1265W-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 DS1265W-150+ part is unused and in its original packaging.
Return procedure for DS1265W-150+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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