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

Analog Devices Inc./Maxim Integrated DS1245Y-85+

Name: DS1245Y-85+
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1245Y-85+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1245Y-85+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Memory

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

Datasheet:: DS1245Y-85+.pdf

Description:: IC NVSRAM 1MBIT PARALLEL 32EDIP

Quantity:: RFQ Add To RFQ list

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Inventory:1,306

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Product details

Overview

DS1245Y-85+ from Maxim Integrated is a 1024k (131,072 × 8) nonvolatile static RAM with integrated lithium backup, JEDEC-standard 32-pin DIP package, ±10% V_CC operating range (4.5V–5.5V), 70 ns access time, and guaranteed 10-year data retention without external power. It serves as a drop-in replacement for volatile 128k × 8 SRAMs in industrial control memory buffers requiring persistent state during brownouts.

For engineers reviewing the DS1245Y-85+ datasheet, DS1245Y-85+ pinout, DS1245Y-85+ application, or DS1245Y-85+ equivalent, key selection criteria include write-protection voltage threshold (4.25V), industrial temperature support (–40°C to +85°C), battery-freshness seal activation at first power-up, and compatibility with standard bytewide 32-pin DIP sockets.

Technical Context

The DS1245Y-85+ integrates SRAM, lithium battery, and autonomous power-fail detection circuitry into a single monolithic module. Its control logic continuously monitors V_CC; when voltage drops below 4.25V, it unconditionally enables write protection, disables all inputs, places outputs in high-Z, and switches to battery power at ~3.0V.

It operates in three distinct modes: normal read/write (V_CC ≥ 4.5V), data retention (V_CC < 3.0V, battery-powered), and transitional power-down/power-up (3.0V ≤ V_CC < 4.25V). The device requires no external support circuitry and supports unlimited write cycles with full CMOS compatibility.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	1024 kbit (131,072 × 8), directly replaces 128k × 8 volatile SRAMs without address decoding changes
Access Time	70 ns - ensures compatibility with 14 MHz bus timing in legacy microprocessor systems
V_CC Range	4.5V to 5.5V (±10%) - supports wide-input industrial power rails without regulation
Data Retention	10 years minimum without external power - enabled by sealed lithium cell and automatic disconnect until first power application
Write Protection Threshold	4.25V (min) - triggers unconditional write lock before critical logic voltage collapse
Operating Temperature	–40°C to +85°C (IND grade) - qualified for embedded industrial environments without derating
Package	32-pin 740-mil extended DIP - JEDEC-standard footprint, wave-solder compatible, no reflow required

Pinout & Package

DS1245Y-85+ uses a JEDEC-standard 32-pin extended DIP (740-mil) package with integrated lithium battery and nonvolatile control circuitry. No external backup components are needed.

Pin/Terminal	Circuit Role	Design Meaning
A0–A16	Address Inputs	17-bit address bus supporting full 131,072-word addressing; TTL/CMOS compatible
DQ0–DQ7	Data I/O	Bidirectional 8-bit data bus; high-impedance during write or chip deselect
CE	Chip Enable	Active-low chip select; initiates read/write when low with WE/OE conditions satisfied
WE	Write Enable	Active-low write strobe; controls data latching and output disable during writes
OE	Output Enable	Active-low output enable; separates read timing from chip select for multiplexed bus designs
V_CC	Power Supply	+5V supply input; powers SRAM and control logic; monitored for fail detection
GND	Ground	Reference return path for all signals and internal battery switching circuitry
NC	No Connect	Pins 1, 17, 32 - unused; must remain unconnected per datasheet

Key Features

Feature	Design Value
Automatic Power-Fail Response	Sub-µs detection of V_CC decay below 4.25V triggers immediate write protection and battery switchover at ~3.0V
Freshness Seal	Lithium source electrically disconnected until first V_CC > 4.25V application - preserves full 10-year retention capacity
Unlimited Write Cycles	No endurance limit - eliminates wear-leveling firmware overhead in logging or configuration storage
Zero-Support Circuitry	Operates stand-alone - no external capacitors, regulators, or supervisory ICs required for nonvolatile operation
Industrial Temperature Grade	–40°C to +85°C operation validated across full V_CC range - suitable for uncontrolled enclosure deployments

Applications

PLC Data Buffer Memory	Medical Device Configuration Storage
Use Scenario: Retaining real-time process variables and alarm history during AC mains interruption in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile SRAM buffer holding last valid sensor snapshot and control state prior to power loss. Use Value: Eliminates need for EEPROM write delays or Flash erase cycles - preserves data within 1.5 µs of V_CC failure detection.	Use Scenario: Storing calibration coefficients, patient settings, and usage logs in portable diagnostic equipment with intermittent battery operation. IC Role / Device Role / Timing Role: Primary configuration memory that survives removal of main battery for service or charging. Use Value: Guarantees 10-year data integrity without periodic refresh or external backup power management.
Avionics Black Box Recorder	Energy Meter Firmware Parameter Table
Use Scenario: Capturing flight-critical telemetry in commercial aircraft recorders where power may be lost mid-flight. IC Role / Device Role / Timing Role: High-reliability memory buffer capturing timestamped sensor data streams during emergency shutdown. Use Value: Meets DO-160 lightning-induced transient immunity requirements via autonomous battery switchover at 3.0V.	Use Scenario: Holding tariff schedules, billing registers, and communication protocol parameters in smart electricity meters deployed outdoors. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile memory storing utility-defined operational parameters across seasonal temperature swings. Use Value: Industrial temperature rating (–40°C to +85°C) and ±10% V_CC tolerance ensure stable operation under grid voltage sags and thermal stress.

PLC Data Buffer Memory

Medical Device Configuration Storage

Use Scenario: Retaining real-time process variables and alarm history during AC mains interruption in programmable logic controllers.

IC Role / Device Role / Timing Role: Nonvolatile SRAM buffer holding last valid sensor snapshot and control state prior to power loss.

Use Value: Eliminates need for EEPROM write delays or Flash erase cycles - preserves data within 1.5 µs of V_CC failure detection.

Use Scenario: Storing calibration coefficients, patient settings, and usage logs in portable diagnostic equipment with intermittent battery operation.

IC Role / Device Role / Timing Role: Primary configuration memory that survives removal of main battery for service or charging.

Use Value: Guarantees 10-year data integrity without periodic refresh or external backup power management.

Avionics Black Box Recorder

Energy Meter Firmware Parameter Table

Use Scenario: Capturing flight-critical telemetry in commercial aircraft recorders where power may be lost mid-flight.

IC Role / Device Role / Timing Role: High-reliability memory buffer capturing timestamped sensor data streams during emergency shutdown.

Use Value: Meets DO-160 lightning-induced transient immunity requirements via autonomous battery switchover at 3.0V.

Use Scenario: Holding tariff schedules, billing registers, and communication protocol parameters in smart electricity meters deployed outdoors.

IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile memory storing utility-defined operational parameters across seasonal temperature swings.

Use Value: Industrial temperature rating (–40°C to +85°C) and ±10% V_CC tolerance ensure stable operation under grid voltage sags and thermal stress.

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%, 4.75V–5.25V); higher write-protection threshold (4.50V)	Better suited for tightly regulated 5V systems; less tolerant of brownouts	Select DS1245AB-70IND+ only if system V_CC remains within ±5% and early write-lock is acceptable
STK12C68-A70I	Same 1024k size and 70 ns speed, but uses external capacitor-based backup; no integrated lithium	Requires external 0.1F supercapacitor and charge circuit; shorter retention (~72 hours)	Choose STK12C68-A70I only when long-term retention is unnecessary and cost sensitivity outweighs reliability needs

Compared with DS1245AB-70IND+, DS1245Y-85+ trades tighter supply regulation for wider brownout resilience; compared with STK12C68-A70I, it delivers true 10-year retention without external energy storage or charging circuitry.

Availability

DS1245Y-85+ is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics, avionics recorders, and smart energy meters requiring stable component supply with guaranteed long-term data retention and industrial temperature performance.

Supply support for DS1245Y-85+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.

The DS1245Y-85+ belongs to Maxim's nonvolatile SRAM product line, designed specifically to eliminate external backup circuitry in mission-critical memory applications where data persistence during uncontrolled power loss is mandatory.

FAQ

What is the guaranteed data retention period for DS1245Y-85+?

The DS1245Y-85+ guarantees a minimum 10-year data retention period in the absence of external power, measured cumulatively from the time V_CC is first applied. This is achieved through an electrically disconnected lithium cell that activates only upon initial power-up, preserving full energy capacity for long-term backup.

Does DS1245Y-85+ require external components to operate as nonvolatile memory?

No, DS1245Y-85+ operates as a fully self-contained nonvolatile SRAM. It integrates the SRAM array, lithium battery, and power-fail detection/control circuitry into a single 32-pin DIP package. No external capacitors, regulators, or supervisory ICs are required for basic nonvolatile functionality.

What is the write-protection voltage threshold for DS1245Y-85+?

The DS1245Y-85+ asserts unconditional write protection when V_CC falls below 4.25V (minimum), with typical activation at 4.37V. This threshold is lower than the DS1245AB variant (4.50V), making DS1245Y-85+ more tolerant of gradual brownouts while maintaining data integrity.

Can DS1245Y-85+ be used in place of standard 128k × 8 SRAMs?

Yes, DS1245Y-85+ is pin-compatible and functionally equivalent to standard 128k × 8 volatile SRAMs in 32-pin DIP sockets. Its 131,072 × 8 organization matches the same address/data bus interface, enabling direct replacement without PCB or firmware changes.

Is DS1245Y-85+ RoHS-compliant and lead-free?

Yes, DS1245Y-85+ carries the "+" suffix, indicating it is lead(Pb)-free and RoHS-compliant. The package meets JEDEC standards for wave soldering and is rated for industrial temperature operation (–40°C to +85°C) without derating.

DS1245Y-85+ 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:: 85ns

Access Time:: 85 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-85+ FAQ

1.How can I place an order for DS1245Y-85+ through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1245Y-85+ 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-85+ reliable?

The price and inventory of DS1245Y-85+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1245Y-85+ is usually 5 days.

3.What payment methods are accepted for DS1245Y-85+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1245Y-85+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1245Y-85+?

DS1245Y-85+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1245Y-85+ 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-85+?

For technical support, including DS1245Y-85+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1245Y-85+ requirements.

6.How does Aetrix verify that DS1245Y-85+ is sourced from the original manufacturer or authorized distributors?

All DS1245Y-85+ 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-85+ meets industry standards.

7.What is the process for return or replacement of DS1245Y-85+?

All DS1245Y-85+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1245Y-85+, 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-85+ part is unused and in its original packaging.

Return procedure for DS1245Y-85+:

1.Submit a request within 90 days.

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

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