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Analog Devices Inc./Maxim Integrated DS1265W-100IND
- Part No.:
- DS1265W-100IND
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- 36-DIP Module (0.610", 15.49mm)
- Datasheet:
-
DS1265W-100IND.pdf
- Description:
- IC NVSRAM 8MBIT PARALLEL 36EDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,365
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Product details
Overview
DS1265W-100IND from Maxim Integrated (now Analog Devices) is an 8Mb nonvolatile SRAM with lithium-backed data retention, organized as 1,048,576 × 8 bits, operating at 3.3V with 100ns read/write access time and industrial temperature range (–40°C to +85°C). It provides automatic write protection during power loss and guarantees ≥10 years data retention without external power.
For engineers reviewing the DS1265W-100IND datasheet, DS1265W-100IND pinout, DS1265W-100IND application, or DS1265W-100IND equivalent, key selection considerations include its self-contained lithium backup, zero-write-cycle limit, 3.3V CMOS interface timing, industrial-grade VCC monitoring threshold (2.8V), and 36-pin 740mil EDIP package compatibility with standard microprocessor buses.
Technical Context
The DS1265W-100IND integrates a lithium battery, voltage monitor, and power-switching circuit in a monolithic 36-pin EDIP package. Its VCC supervision logic triggers automatic write protection when supply drops below 2.8V and switches to battery backup below ~2.5V - no external components required.
It supports standard asynchronous SRAM protocols: CE/OE/WE control enables read cycles (CE&OE low, WE high) and write cycles (CE&WE low), with tACC = tRC = tWC = 100ns, tOE = 50ns, and tCO = 100ns at VCC = 3.3V ±0.3V across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 8,388,608-bit (1,048,576 × 8) nonvolatile SRAM |
| Supply Voltage | 3.3V ±0.3V - operates fully functional above 3.0V, write-protects at ≤2.8V |
| Access Time | 100ns - defines minimum cycle time for reliable read/write under worst-case industrial temp |
| Data Retention | ≥10 years without power - enabled by internal lithium cell and automatic power-switching |
| Write Cycles | Unlimited - no endurance degradation due to battery-backed architecture |
| Operating Temp | –40°C to +85°C - qualified for industrial environments without derating |
| Standby Current | 100–250µA - ultra-low ICCS2 enables long-term battery-backed standby |
Pinout & Package
DS1265W-100IND uses a 36-pin 740mil Extended Dual In-line Package (EDIP) with through-hole mounting and RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A19 | Address Inputs | 20-bit address bus supporting full 1M-word addressing; TTL/CMOS compatible |
| DQ0–DQ7 | Data I/O | 8-bit bidirectional data bus; high-impedance when CE/OE inactive or during write |
| CE | Chip Enable | Active-low chip select; initiates read/write when low with OE/WE appropriately asserted |
| WE | Write Enable | Active-low write strobe; controls data latching and output disable during writes |
| OE | Output Enable | Active-low output enable; disables outputs when high to prevent bus contention |
| VCC | Power Supply | +3.3V primary supply; powers logic and enables lithium disconnect until first power-up |
| GND | Ground | Reference return path for all signals and internal switching circuitry |
| NC | No Connect | Pins 13, 24, 35 - physically present but internally unconnected; must remain floating |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-Fail Protection | Monitors VCC continuously; asserts unconditional write protection and high-Z outputs when VCC < 2.8V |
| Freshness Seal | Lithium source electrically disconnected until first VCC application > VTP (2.8V), preserving full 10-year capacity |
| Zero External Support Circuitry | Integrated battery switch, voltage detector, and backup controller eliminate need for external capacitors, diodes, or supervisors |
| Asynchronous Bus Interface | Standard CE/OE/WE timing compatible with legacy 8051, Z80, and 68K microprocessor buses without glue logic |
| Industrial Temperature Qualification | Full DC/AC specs guaranteed over –40°C to +85°C, including tACC = 100ns and ICCS2 ≤ 150µA |
Applications
| Industrial Data Logger | Medical Device Memory |
|---|---|
Use Scenario: Standalone environmental sensor node logging timestamped readings every 5 seconds, powered intermittently via solar charger. IC Role / Device Role / Timing Role: Nonvolatile SRAM storing last 10,000 records; retains data during multi-day power outages between charge cycles. Use Value: Eliminates need for EEPROM wear-leveling or flash programming delays; enables instant resume after power restoration with no data loss. | Use Scenario: Portable ECG monitor capturing real-time waveform buffers before wireless transmission to base station. IC Role / Device Role / Timing Role: High-speed buffer memory holding up to 32 seconds of raw 1ksps analog samples; preserves critical diagnostic data during sudden battery swap. Use Value: Guarantees zero data corruption during hot-swap events via sub-2µs VCC-fail detection and immediate write protect activation. |
| Avionics Black Box Recorder | Railway Signaling Controller |
Use Scenario: Crash-protected flight data recorder capturing engine parameters, attitude, and control inputs at 100Hz. IC Role / Device Role / Timing Role: Primary nonvolatile storage for last 25 hours of telemetry; survives extreme thermal shock and vibration. Use Value: Meets DO-160 Section 22 Category S requirements via –40°C to +85°C operation and 10-year retention without refresh. | Use Scenario: Wayside interlocking system logging signal state transitions and fault events for SIL-4 safety certification. IC Role / Device Role / Timing Role: Tamper-proof event log memory with deterministic 100ns write latency and fail-safe power-down behavior. Use Value: Enables EN 50129-compliant audit trail generation with guaranteed integrity even during grid brownouts or lightning-induced surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK12C68-AW50I | 5V-only supply; 50ns access; 64K × 8 organization; no integrated lithium (requires external battery) | Limited to 5V systems; requires external supervisor and backup diode network | Choose only if legacy 5V design mandates pin-compatible upgrade with minimal layout change |
| ISL71091SEH | Radiation-hardened QML-V; 16Mb density; 150ns access; MIL-PRF-38535 Class V qualified | Targeted for space-grade applications; higher cost and longer lead times; not industrial-temperature optimized | Select when radiation tolerance, extended reliability testing, or space qualification outweighs cost and speed trade-offs |
Compared with STK12C68-AW50I and ISL71091SEH, DS1265W-100IND uniquely delivers 3.3V operation, 100ns timing, and fully integrated lithium backup in a commercial-industrial dual-qualified package - making it optimal for cost-sensitive, high-reliability terrestrial embedded systems requiring zero external support components.
Availability
DS1265W-100IND is available at Aetrix Electronics and suitable for industrial data loggers, medical device buffers, avionics recorders, and railway signaling controllers requiring stable component supply, long-term lifecycle assurance, and guaranteed industrial temperature performance.
Supply support for DS1265W-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
Analog Devices (via acquisition of Maxim Integrated) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The DS1265W-100IND belongs to Maxim's legacy nonvolatile SRAM product line, engineered specifically for mission-critical data retention in systems where power interruption is frequent or unpredictable.
FAQ
What is the guaranteed data retention period for DS1265W-100IND without external power?
The DS1265W-100IND guarantees ≥10 years of data retention in the absence of external power, measured cumulatively from the time VCC is first applied and the internal lithium energy source is activated. This specification is validated under industrial temperature conditions (–40°C to +85°C) and accounts for self-discharge characteristics of the integrated lithium cell.
Does DS1265W-100IND require external circuitry for battery backup operation?
No, DS1265W-100IND requires no external circuitry for battery backup operation. It integrates a lithium energy source, voltage monitor, and power-switching circuit. The lithium cell remains electrically disconnected until first VCC application exceeds 2.8V, ensuring full capacity retention at shipment.
What happens to DS1265W-100IND outputs during power failure?
During power failure, DS1265W-100IND automatically places all outputs in high-impedance state within 1.5µs of VCC falling below the detection threshold. Simultaneously, write protection is unconditionally enabled, address/data inputs become "don't care," and the lithium source powers the SRAM core to preserve data.
Can DS1265W-100IND be used in a 5V system?
No, DS1265W-100IND is strictly a 3.3V device with absolute maximum VCC of +4.6V. Operation at 5V violates Absolute Maximum Ratings and risks permanent damage. For 5V systems, consider legacy alternatives like STK12C68-AW50I - but note they lack integrated lithium and require external support components.
Is DS1265W-100IND pin-compatible with other DS1265W speed grades?
Yes, DS1265W-100IND shares identical 36-pin EDIP pinout and signal assignments with DS1265W-100+ (commercial grade) and DS1265W-120IND+, differing only in AC timing specifications and temperature qualification. All variants use the same footprint, address/data/control mapping, and power sequencing behavior.
DS1265W-100IND Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 36-DIP Module (0.610", 15.49mm)
- Packaging:
- Tube
- 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:
- 100ns
- Access Time:
- 100 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 36-EDIP
DS1265W-100IND FAQ
1.How can I place an order for DS1265W-100IND through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1265W-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 DS1265W-100IND reliable?
The price and inventory of DS1265W-100IND are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1265W-100IND is usually 5 days.
3.What payment methods are accepted for DS1265W-100IND?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1265W-100IND transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1265W-100IND?
DS1265W-100IND orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1265W-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 DS1265W-100IND?
For technical support, including DS1265W-100IND datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1265W-100IND requirements.
6.How does Aetrix verify that DS1265W-100IND is sourced from the original manufacturer or authorized distributors?
All DS1265W-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 DS1265W-100IND meets industry standards.
7.What is the process for return or replacement of DS1265W-100IND?
All DS1265W-100IND units undergo pre-shipment inspection (PSI). If there is an issue with DS1265W-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 DS1265W-100IND part is unused and in its original packaging.
Return procedure for DS1265W-100IND:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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