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Analog Devices Inc./Maxim Integrated DS1245AB-70IND+
- Part No.:
- DS1245AB-70IND+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- 32-DIP Module (0.600", 15.24mm)
- Datasheet:
-
DS1245AB-70IND+.pdf
- Description:
- IC NVSRAM 1MBIT PARALLEL 32EDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,550
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Product details
Overview
DS1245AB-70IND+ from Maxim Integrated is a 1024k (131,072 × 8) nonvolatile static RAM with lithium backup, industrial temperature range (–40°C to +85°C), ±5% VCC tolerance (4.75V–5.25V), and 70 ns read/write access time. It replaces volatile SRAM, EEPROM, or Flash in mission-critical data logging and configuration storage applications where power loss immunity is essential.
For engineers reviewing the DS1245AB-70IND+ datasheet, DS1245AB-70IND+ pinout, DS1245AB-70IND+ application, or DS1245AB-70IND+ equivalent, key selection criteria include guaranteed 10-year data retention without external power, automatic write-protection below 4.5 V, JEDEC-standard 32-pin DIP compatibility, and industrial-grade reliability for embedded control systems.
Technical Context
The DS1245AB-70IND+ integrates self-contained lithium battery, SRAM core, and voltage-monitoring control circuitry into a single JEDEC 32-pin EDIP package. Its power-fail detection triggers unconditional write protection when VCC drops below 4.50 V, and automatically switches to battery power below ~3.0 V.
It operates as a byte-wide parallel memory with full static timing: CE/OE/WE-controlled read/write cycles, no refresh required, and unlimited write endurance. The device uses standard TTL-compatible logic levels and supports microprocessor bus interfacing without external support circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1024 kbit (131,072 × 8), directly replaces 128k × 8 SRAMs on existing 32-pin DIP footprints |
| Access Time | 70 ns - ensures compatibility with 14 MHz bus timing and eliminates wait states in legacy 8/16-bit microcontroller systems |
| VCC Range | 4.75 V to 5.25 V (±5%) - supports stable operation across industrial-grade 5 V supply rails with margin for ripple and dropouts |
| Data Retention | 10 years minimum without external power - enabled by factory-sealed lithium cell disconnected until first VCC application |
| Write Protection Threshold | 4.50 V to 4.75 V - guarantees early, deterministic lockout before system brownout corrupts memory writes |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, metering, and transportation electronics without derating |
| Package | 32-pin 740-mil Extended DIP (EDIP) - JEDEC-standard through-hole footprint with integrated battery and control logic |
Pinout & Package
DS1245AB-70IND+ uses a JEDEC-standard 32-pin Extended DIP (740-mil) package with integrated lithium battery and nonvolatile control circuitry. All pins conform to industry-standard SRAM pinout for drop-in replacement of volatile memory.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 131,072-word addressing; compatible with standard microprocessor address lines |
| DQ0–DQ7 | Data I/O | Bi-directional 8-bit data bus with TTL-compatible drive strength (IOL = 2.0 mA, IOH = –1.0 mA) |
| CE | Chip Enable | Active-low chip select; initiates read/write when low and synchronized with WE/OE; controls standby current (50–150 µA) |
| WE | Write Enable | Active-low write strobe; determines write start/stop edges with CE; disables outputs during write if OE is active |
| OE | Output Enable | Active-low output enable; enables data drivers only during reads; high during writes prevents bus contention |
| VCC | Power Supply | +5 V supply input (4.75–5.25 V); powers SRAM and control logic; monitored continuously for fail detection |
| GND | Ground | Reference return path for all signals and power; decoupling required per standard SRAM layout practice |
| NC | No Connect | Pins 1, 2, 3, 17, 33, 34 - electrically isolated; no internal connection; must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-Fail Write Protection | Hardware-enforced lockout triggered at 4.50–4.75 V; no firmware or external supervisor IC required |
| Lithium Cell Freshness Seal | Factory-disconnected battery retains full capacity until first VCC > 4.25 V application; extends usable life beyond 10 years |
| Unlimited Write Cycles | No wear-out mechanism - unlike EEPROM/Flash, supports continuous logging without endurance limits |
| Zero-Refresh Static Operation | Eliminates external refresh circuitry and timing constraints; simplifies interface design for microcontrollers and ASICs |
| Industrial Temperature Qualification | Full DC/AC specs guaranteed from –40°C to +85°C - validated for use in outdoor meters, PLCs, and rail infrastructure |
Applications
| Industrial Data Logger | Smart Meter Configuration Storage |
|---|---|
Use Scenario: Continuous timestamped sensor readings stored during mains power outages in remote environmental monitoring stations. IC Role / Device Role / Timing Role: Nonvolatile SRAM holding real-time operational data and calibration tables; maintains integrity during unpredictable blackouts. Use Value: 10-year retention and automatic write-protection ensure zero data loss across decades of intermittent grid power. | Use Scenario: Storing tariff schedules, billing registers, and cryptographic keys in electricity/water/gas meters exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary configuration memory with tamper-resistant write-lock behavior during brownouts or battery swaps. Use Value: ±5% VCC tolerance and –40°C to +85°C operation guarantee reliable retention in uncontrolled outdoor enclosures. |
| PLC I/O State Backup | Medical Device Setup Memory |
Use Scenario: Preserving digital I/O state and ladder logic variables during brief AC line dips in factory automation controllers. IC Role / Device Role / Timing Role: Volatile SRAM replacement that retains critical process state without external backup capacitors or supercaps. Use Value: 70 ns access time enables direct CPU bus attachment; automatic switch to lithium power occurs within 1.5 µs of VCC failure. | Use Scenario: Holding user-configured therapy parameters and calibration offsets in portable infusion pumps and diagnostic equipment. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory ensuring treatment continuity after accidental power removal or battery replacement. Use Value: UL-recognized module (E99151) and guaranteed 10-year data retention meet IEC 62304 software safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS1245Y-70IND+ | Wider VCC range (±10%, 4.5–5.5 V); lower write-protection threshold (4.25–4.5 V) | Better suited for systems with unstable 5 V supplies or tighter brownout margins | Select DS1245Y-70IND+ only if supply variation exceeds ±5%; otherwise DS1245AB-70IND+ offers tighter regulation and higher noise immunity |
| STK12C68-A70I | Same 1024k size and 70 ns speed but uses external capacitor-based backup; no integrated lithium | Requires external 0.1–1 F supercapacitor and charge circuit; shorter retention (up to 72 hours) | Choose STK12C68-A70I only when long-term retention is unnecessary and cost sensitivity outweighs board space and reliability needs |
Compared with DS1245Y-70IND+, the DS1245AB-70IND+ provides superior voltage noise margin and deterministic write-lock behavior; compared with STK12C68-A70I, it delivers true 10-year retention without external components or recharge management overhead.
Availability
DS1245AB-70IND+ is available at Aetrix Electronics and suitable for industrial data loggers, smart metering systems, and programmable logic controller (PLC) I/O backup requiring stable component supply, long-lifecycle assurance, and RoHS-compliant through-hole packaging.
Supply support for DS1245AB-70IND+ 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 power management ICs for industrial, automotive, and communications applications.
The DS1245AB-70IND+ belongs to Maxim's nonvolatile SRAM product line, engineered specifically for seamless replacement of volatile memory in systems demanding guaranteed data integrity during power interruption.
FAQ
What is the guaranteed data retention period for DS1245AB-70IND+?
The DS1245AB-70IND+ guarantees a minimum 10-year data retention period in the absence of external power, measured cumulatively from the time VCC is first applied. This is achieved via a factory-sealed lithium cell disconnected until initial power-up, ensuring full energy capacity and verified through component selection, process control, and design validation-not production testing.
Does DS1245AB-70IND+ require external support circuitry for microprocessor interfacing?
No, DS1245AB-70IND+ requires no external support circuitry for microprocessor interfacing. It features fully static operation, TTL-compatible inputs/outputs, and built-in voltage monitoring with automatic write protection and battery switchover-enabling direct connection to standard 8-bit or 16-bit bus architectures without refresh controllers, supervisors, or backup capacitors.
What is the function of the NC pins on DS1245AB-70IND+?
The NC (No Connect) pins on DS1245AB-70IND+-pins 1, 2, 3, 17, 33, and 34-are electrically isolated with no internal connection. They must remain unconnected in the PCB layout. These pins exist for mechanical compatibility and package standardization but carry no signal or power function in the DS1245AB-70IND+ device.
How does DS1245AB-70IND+ handle power-down and power-up transitions?
During power-down, DS1245AB-70IND+ detects VCC decay below 4.5 V and activates write protection within 1.5 µs; below ~3.0 V, it switches to lithium power. During power-up, it reconnects VCC and disconnects the battery once VCC exceeds ~3.0 V, resuming normal operation after VCC stabilizes above 4.75 V-ensuring glitch-free transition without data corruption.
Is DS1245AB-70IND+ RoHS-compliant and UL-recognized?
Yes, DS1245AB-70IND+ is RoHS-compliant (indicated by the '+' suffix) and UL-recognized under file E99151. Its construction meets lead-free soldering requirements, and its nonvolatile module architecture has been evaluated by Underwriters Laboratories for safety compliance in industrial end equipment.
DS1245AB-70IND+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-DIP Module (0.600", 15.24mm)
- 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:
- 70ns
- Access Time:
- 70 ns
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-EDIP
DS1245AB-70IND+ FAQ
1.How can I place an order for DS1245AB-70IND+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1245AB-70IND+ 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 DS1245AB-70IND+ reliable?
The price and inventory of DS1245AB-70IND+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1245AB-70IND+ is usually 5 days.
3.What payment methods are accepted for DS1245AB-70IND+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1245AB-70IND+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1245AB-70IND+?
DS1245AB-70IND+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1245AB-70IND+ 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 DS1245AB-70IND+?
For technical support, including DS1245AB-70IND+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1245AB-70IND+ requirements.
6.How does Aetrix verify that DS1245AB-70IND+ is sourced from the original manufacturer or authorized distributors?
All DS1245AB-70IND+ 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 DS1245AB-70IND+ meets industry standards.
7.What is the process for return or replacement of DS1245AB-70IND+?
All DS1245AB-70IND+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1245AB-70IND+, 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 DS1245AB-70IND+ part is unused and in its original packaging.
Return procedure for DS1245AB-70IND+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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