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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Analog Devices Inc./Maxim Integrated DS1245Y-70

Name: DS1245Y-70
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1245Y-70
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1245Y-70

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Memory

Package:: 32-DIP Module (0.600", 15.24mm)

Datasheet:: DS1245Y-70.pdf

Description:: IC NVSRAM 1MBIT PARALLEL 32EDIP

Quantity:: RFQ Add To RFQ list

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Inventory:3,907

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Product details

Overview

DS1245Y-70 from Maxim Integrated is a 1024k (131,072 × 8) nonvolatile static RAM with lithium backup, JEDEC-standard 32-pin DIP package, ±10% V_CC operation (4.5V–5.5V), 70 ns access time, and industrial temperature rating (-40°C to +85°C). It replaces volatile SRAM in battery-backed memory systems for data logging and configuration storage.

For engineers reviewing the DS1245Y-70 datasheet, DS1245Y-70 pinout, DS1245Y-70 application, or DS1245Y-70 equivalent, key selection factors include write-protection voltage (4.25V), data retention (10 years without power), standby current (≤600 µA), and compatibility with standard 32-pin bytewide DIP sockets in legacy industrial controllers.

Technical Context

The DS1245Y-70 integrates self-contained lithium energy source and voltage-monitoring circuitry that automatically enables write protection when V_CC falls below 4.25V and switches to battery power below ~3.0V. Its control logic ensures unconditional data integrity during power loss without external supervision.

It operates as a fully static, byte-wide parallel memory with standard SRAM timing: CE/OE/WE control signals, 17 address lines (A0–A16), and 8 bidirectional data lines (DQ0–DQ7). No support circuitry is required for microprocessor interfacing, and it supports unlimited write cycles with no wear leveling.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	1024 kbit (131,072 × 8), directly replaces 128k × 8 volatile SRAMs in existing sockets
Access Time	70 ns - guarantees full-speed read/write compatibility with 14 MHz bus systems
V_CC Range	4.5V to 5.5V (±10%) - supports wide-input industrial power rails without regulation
Data Retention	10 years without external power - enabled by sealed lithium cell and automatic power-switching circuit
Write Protection Threshold	4.25V (min) - triggers immediate hardware write lock before data corruption occurs
Operating Temp	-40°C to +85°C (IND grade) - qualified for uncontrolled industrial environments
Standby Current	≤600 µA at V_CC = 5V - minimizes battery drain during long-term backup mode

Pinout & Package

DS1245Y-70 uses a JEDEC-standard 32-pin Extended DIP (740-mil) package with integrated lithium battery and control circuitry. Pinout conforms to industry-standard bytewide SRAM layout for drop-in replacement.

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	Bidirectional 8-bit data bus; high-impedance outputs when CE/OE inactive
CE	Chip Enable	Active-low chip select; controls device enable and write-cycle initiation timing
WE	Write Enable	Active-low write strobe; determines write start/stop edges with CE per AC specs
OE	Output Enable	Active-low output control; enables data drivers only during read cycles
V_CC	Power Supply	+5V supply input; monitored continuously for write-protection and battery switchover
GND	Ground	Reference return path for all signals and internal circuitry
NC	No Connect	Unbonded pins (pins 1, 2, 3, 33, 34); must remain unconnected

Key Features

Feature	Design Value
Automatic Power-Fail Response	Hardware-monitored V_CC triggers write protection and battery switchover within 1.5 µs - no firmware or external supervisor needed
Freshness Seal	Lithium source electrically disconnected until first V_CC > 4.25V applied - preserves full 10-year retention capacity from shipment
Unlimited Write Cycles	No endurance limit - eliminates wear-leveling overhead and write-allocation complexity in firmware
Standardized Pinout	JEDEC 32-pin DIP layout matches legacy 128k × 8 SRAMs - enables direct socket replacement without PCB redesign
Industrial Temperature Support	Qualified from -40°C to +85°C - validated for operation in programmable logic controllers and remote telemetry units

Applications

Industrial Data Logger	PLC Configuration Memory
Use Scenario: Continuous recording of sensor readings and event timestamps in unattended field deployments. IC Role / Device Role / Timing Role: Nonvolatile SRAM storing real-time operational data with guaranteed retention during grid outages or battery swaps. Use Value: Eliminates need for EEPROM write delays or Flash erase cycles; enables sub-microsecond writes and instant power-loss recovery.	Use Scenario: Storing ladder logic parameters, I/O mapping, and calibration constants in programmable logic controllers. IC Role / Device Role / Timing Role: Byte-accessible, pin-compatible memory holding critical configuration that must survive unexpected shutdowns. Use Value: Maintains functional state across power cycles without initialization delay or checksum validation overhead.
Medical Device Settings Storage	Telecom Base Station Clock Backup
Use Scenario: Preserving user-adjusted therapy parameters and usage history in portable diagnostic equipment. IC Role / Device Role / Timing Role: Tamper-resistant, low-power memory retaining settings through battery replacement and sterilization cycles. Use Value: Meets IEC 62304 data integrity requirements with hardware-enforced write protection below 4.25V.	Use Scenario: Backing up real-time clock registers and synchronization state in cellular base station control cards. IC Role / Device Role / Timing Role: Low-latency SRAM preserving time-critical timing registers during AC mains failure. Use Value: Prevents clock drift and service interruption by maintaining register contents with <1.5 µs fail-detect response.

Industrial Data Logger

PLC Configuration Memory

Use Scenario: Continuous recording of sensor readings and event timestamps in unattended field deployments.

IC Role / Device Role / Timing Role: Nonvolatile SRAM storing real-time operational data with guaranteed retention during grid outages or battery swaps.

Use Value: Eliminates need for EEPROM write delays or Flash erase cycles; enables sub-microsecond writes and instant power-loss recovery.

Use Scenario: Storing ladder logic parameters, I/O mapping, and calibration constants in programmable logic controllers.

IC Role / Device Role / Timing Role: Byte-accessible, pin-compatible memory holding critical configuration that must survive unexpected shutdowns.

Use Value: Maintains functional state across power cycles without initialization delay or checksum validation overhead.

Medical Device Settings Storage

Telecom Base Station Clock Backup

Use Scenario: Preserving user-adjusted therapy parameters and usage history in portable diagnostic equipment.

IC Role / Device Role / Timing Role: Tamper-resistant, low-power memory retaining settings through battery replacement and sterilization cycles.

Use Value: Meets IEC 62304 data integrity requirements with hardware-enforced write protection below 4.25V.

Use Scenario: Backing up real-time clock registers and synchronization state in cellular base station control cards.

IC Role / Device Role / Timing Role: Low-latency SRAM preserving time-critical timing registers during AC mains failure.

Use Value: Prevents clock drift and service interruption by maintaining register contents with <1.5 µs fail-detect response.

Equivalent & Alternatives

The following parts are listed as comparable options for similar nonvolatile SRAM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS1245AB-70IND+	Narrower V_CC tolerance (±5%, 4.75–5.25V); higher write-protection threshold (4.5V)	Better suited for tightly regulated 5V systems where margin above 4.75V is guaranteed	Select DS1245AB-70IND+ if system V_CC remains ≥4.75V under worst-case load and ripple
STK12C68	Same 128k × 8 organization but 100 ns access; uses external battery; different pinout (28-pin SOJ)	Requires PCB layout change and external battery management circuitry	Choose STK12C68 only if legacy board space constraints preclude 32-pin DIP or if cost sensitivity outweighs design effort

Compared with DS1245AB-70IND+, the DS1245Y-70 offers wider supply tolerance and lower write-protection voltage for less-regulated industrial rails; compared with STK12C68, it delivers faster access, integrated battery, and true pin-compatible replacement - reducing BOM count and qualification effort.

Availability

DS1245Y-70 is available at Aetrix Electronics and suitable for industrial data loggers, PLC configuration memory, and medical device settings storage requiring stable component supply across extended product lifecycles.

Supply support for DS1245Y-70 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 applications.

The DS1245Y-70 belongs to Maxim's nonvolatile SRAM product line, engineered specifically to eliminate external battery management and provide seamless, socket-compatible replacement for legacy volatile memory in mission-critical systems.

FAQ

What is the guaranteed data retention period for DS1245Y-70?

The DS1245Y-70 guarantees 10 years of data retention in the absence of external power, measured from the time V_CC is first applied. This is achieved via an integrated lithium cell and freshness seal that disconnects the battery until initial power-up, preserving full energy capacity. The DS1245Y-70 meets this specification under industrial temperature conditions (-40°C to +85°C) without requiring external circuitry.

Does DS1245Y-70 require external support components for microprocessor interfacing?

No, the DS1245Y-70 requires no external support components for microprocessor interfacing. It implements full hardware-based power-fail detection, automatic write protection, and battery switchover internally. The DS1245Y-70 uses standard SRAM control signals (CE, WE, OE) and is compatible with common 8-bit and 16-bit microcontrollers without additional glue logic or supervisors.

What is the write-protection voltage threshold for DS1245Y-70?

The DS1245Y-70 activates hardware write protection when V_CC falls to 4.25V (minimum), with typical activation at 4.37V and maximum at 4.5V. This threshold is factory-trimmed and does not require calibration. Once triggered, all inputs become "don't care" and outputs go high-impedance, ensuring data integrity even during brownout conditions. The DS1245Y-70 maintains this behavior across its full industrial temperature range.

Can DS1245Y-70 be used as a direct replacement for standard 128k × 8 SRAMs?

Yes, the DS1245Y-70 is designed as a direct socket-compatible replacement for 128k × 8 volatile SRAMs using the JEDEC-standard 32-pin DIP footprint. Its pinout matches industry-standard bytewide SRAMs, including identical placement of A0–A16, DQ0–DQ7, CE, WE, OE, V_CC, and GND. No PCB modification is required - the DS1245Y-70 adds nonvolatility transparently while maintaining identical timing and electrical interface.

What is the maximum operating temperature range specified for DS1245Y-70?

The DS1245Y-70 is rated for industrial temperature operation from -40°C to +85°C, as confirmed by the "IND" suffix in its ordering code DS1245Y-70IND+. This qualification covers all electrical specifications, including 70 ns access time, write-protection threshold, and 10-year data retention. The DS1245Y-70 undergoes full temperature cycling and burn-in testing per industrial-grade reliability standards.

DS1245Y-70 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:: 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:: 70ns

Access Time:: 70 ns

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 32-EDIP

DS1245Y-70 FAQ

1.How can I place an order for DS1245Y-70 through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1245Y-70 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 DS1245Y-70 reliable?

The price and inventory of DS1245Y-70 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1245Y-70 is usually 5 days.

3.What payment methods are accepted for DS1245Y-70?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1245Y-70 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1245Y-70?

DS1245Y-70 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1245Y-70 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 DS1245Y-70?

For technical support, including DS1245Y-70 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1245Y-70 requirements.

6.How does Aetrix verify that DS1245Y-70 is sourced from the original manufacturer or authorized distributors?

All DS1245Y-70 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 DS1245Y-70 meets industry standards.

7.What is the process for return or replacement of DS1245Y-70?

All DS1245Y-70 units undergo pre-shipment inspection (PSI). If there is an issue with DS1245Y-70, 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 DS1245Y-70 part is unused and in its original packaging.

Return procedure for DS1245Y-70:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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