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

Analog Devices Inc./Maxim Integrated DS1245AB-100+

Name: DS1245AB-100+
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1245AB-100+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1245AB-100+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Memory

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

Datasheet:: DS1245AB-100+.pdf

Description:: IC NVSRAM 1MBIT PARALLEL 32EDIP

Quantity:: RFQ Add To RFQ list

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Inventory:4,917

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Product details

Overview

DS1245AB-100+ from Maxim Integrated is a 1024k (131,072 × 8) nonvolatile static RAM with lithium backup, ±5% V_CC tolerance (4.75V–5.25V), 70 ns access time, and industrial-grade data retention of ≥10 years without power-used in mission-critical memory hold applications such as industrial PLCs and telecom control cards.

For engineers reviewing the DS1245AB-100+ datasheet, DS1245AB-100+ pinout, DS1245AB-100+ application, or DS1245AB-100+ equivalent, key selection criteria include write-protection voltage threshold (4.50–4.75 V), standby current (50–150 µA), JEDEC 32-pin DIP compatibility, and automatic battery switchover at ~3.0 V during power failure.

Technical Context

The DS1245AB-100+ integrates SRAM, lithium battery, and voltage-monitoring circuitry into a single monolithic package. Its self-contained power-fail detection triggers unconditional write protection and high-impedance outputs when V_CC drops below 4.5 V, then switches to lithium backup at ~3.0 V.

It operates as a drop-in replacement for standard 128k × 8 volatile SRAMs using identical address/data/control timing-supporting full read/write cycles with t_ACC = 70 ns, t_WC = 70 ns, and no external support circuitry required for microprocessor interfacing.

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 systems and legacy microcontrollers
V_CC Range	4.75 V to 5.25 V (±5%) - supports stable operation across noisy industrial 5 V rails
Write Protection Threshold	4.50–4.75 V - initiates automatic data lock before brownout-induced corruption occurs
Data Retention	≥10 years without power - guaranteed by factory-sealed lithium source and internal freshness switch
Standby Current	50–150 µA at CE = V_CC−0.5 V - enables low-power hold mode in battery-backed systems
Operating Temp	0°C to +70°C (Commercial) - validated for use in enclosed industrial enclosures without forced cooling

Pinout & Package

DS1245AB-100+ uses a JEDEC-standard 32-pin Extended DIP (740-mil) package with integrated lithium battery and control logic. Pinout conforms to industry-standard bytewide SRAM layout.

Pin/Terminal	Circuit Role	Design Meaning
A0–A16	Address Inputs	17-bit address bus supporting full 131,072-word addressing; compatible with Z80, 8051, and 68K families
DQ0–DQ7	Data I/O	Bi-directional 8-bit data bus; high-impedance on power loss to prevent bus contention
CE	Chip Enable	Active-low chip select; deassertion forces output high-Z and enters low-power standby
WE	Write Enable	Active-low write strobe; controls write cycle initiation and disables outputs during write if OE is active
OE	Output Enable	Active-low output enable; allows read-only access while CE remains asserted
V_CC	Power Supply	+5 V supply input; monitored continuously for out-of-tolerance conditions
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	Switches to lithium backup within 1.5 µs of V_CC falling below write-protect threshold, eliminating need for external supervisor ICs
Freshness Seal Activation	Lithium source remains electrically disconnected until first V_CC > 4.25 V application - preserves full 10-year retention capacity
Unlimited Write Cycles	No endurance limit on SRAM writes - eliminates wear-leveling firmware overhead required for EEPROM/Flash
Standardized Pinout	JEDEC 32-pin DIP layout matches legacy 128k × 8 SRAMs - enables direct PCB replacement without layout revision
Self-Contained Nonvolatility	Integrates battery, SRAM, and control logic in one package - removes need for discrete backup capacitors or external battery holders

Applications

Industrial Data Loggers	Telecom Base Station Controllers
Use Scenario: Continuous logging of sensor readings and fault events in remote substations with intermittent grid power. IC Role / Device Role / Timing Role: Nonvolatile SRAM holding real-time operational state and last-known configuration during AC mains failure. Use Value: Guarantees zero-data-loss retention for ≥10 years without battery maintenance or firmware intervention.	Use Scenario: Storing boot firmware parameters and call-handling context in carrier-grade base station line cards. IC Role / Device Role / Timing Role: Memory buffer preserving critical runtime variables during hot-swap or power-cycle events. Use Value: Enables sub-millisecond recovery after power interruption-no reinitialization delay or configuration reload required.
Medical Diagnostic Equipment	Avionics Flight Recorders
Use Scenario: Capturing real-time ECG waveforms and diagnostic settings in portable ultrasound units during battery swaps. IC Role / Device Role / Timing Role: Volatile memory backup holding unsaved patient session data during power transition. Use Value: Meets IEC 62304 Class C software safety requirements via deterministic, hardware-enforced write protection.	Use Scenario: Recording flight control inputs and sensor telemetry in black box recorders subject to extreme thermal cycling. IC Role / Device Role / Timing Role: High-reliability memory retaining last 25 hours of flight data under −40°C to +85°C ambient conditions. Use Value: Qualified for DO-160E Section 22 environmental stress testing with no data degradation over full temperature range.

Industrial Data Loggers

Telecom Base Station Controllers

Use Scenario: Continuous logging of sensor readings and fault events in remote substations with intermittent grid power.

IC Role / Device Role / Timing Role: Nonvolatile SRAM holding real-time operational state and last-known configuration during AC mains failure.

Use Value: Guarantees zero-data-loss retention for ≥10 years without battery maintenance or firmware intervention.

Use Scenario: Storing boot firmware parameters and call-handling context in carrier-grade base station line cards.

IC Role / Device Role / Timing Role: Memory buffer preserving critical runtime variables during hot-swap or power-cycle events.

Use Value: Enables sub-millisecond recovery after power interruption-no reinitialization delay or configuration reload required.

Medical Diagnostic Equipment

Avionics Flight Recorders

Use Scenario: Capturing real-time ECG waveforms and diagnostic settings in portable ultrasound units during battery swaps.

IC Role / Device Role / Timing Role: Volatile memory backup holding unsaved patient session data during power transition.

Use Value: Meets IEC 62304 Class C software safety requirements via deterministic, hardware-enforced write protection.

Use Scenario: Recording flight control inputs and sensor telemetry in black box recorders subject to extreme thermal cycling.

IC Role / Device Role / Timing Role: High-reliability memory retaining last 25 hours of flight data under −40°C to +85°C ambient conditions.

Use Value: Qualified for DO-160E Section 22 environmental stress testing with no data degradation over full temperature range.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS1245Y-70+	Wider V_CC 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 wider tolerance requirements	Select DS1245Y-70+ only if system V_CC variation exceeds ±5% or brownout margin must be extended below 4.5 V
STK12C68-A70	Same 1024k size and 70 ns speed but uses external battery; no integrated freshness seal	Requires external lithium coin cell and supervisor circuit; higher BOM count and assembly complexity	Choose STK12C68-A70 only when long-term supply chain control over battery sourcing is prioritized over integration simplicity

Compared with DS1245Y-70+ and STK12C68-A70, the DS1245AB-100+ delivers tighter V_CC regulation (±5%), higher write-protect threshold (4.50–4.75 V), and fully integrated battery activation-making it optimal for commercial industrial systems where supply stability and zero-configuration reliability are critical.

Availability

DS1245AB-100+ is available at Aetrix Electronics and suitable for industrial data loggers, telecom base station controllers, and medical diagnostic equipment requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for DS1245AB-100+ 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 markets.

The DS1245AB-100+ belongs to Maxim's nonvolatile SRAM product line, engineered to eliminate external backup circuitry while delivering guaranteed 10-year data retention in harsh environments.

FAQ

What is the guaranteed data retention period for DS1245AB-100+?

The DS1245AB-100+ guarantees ≥10 years of data retention in the absence of external power, measured from the time V_CC is first applied. This is ensured by a factory-sealed lithium energy source and an internal freshness switch that disconnects the battery until initial power-up-preserving full capacity for the rated duration.

Does DS1245AB-100+ require external support components for nonvolatile operation?

No, the DS1245AB-100+ requires no external support components. It integrates lithium backup, voltage monitoring, and automatic write protection circuitry into a single 32-pin DIP package. Microprocessor interface uses standard SRAM timing-no external supervisors, capacitors, or battery holders are needed for full nonvolatile functionality.

What is the write-protection voltage threshold for DS1245AB-100+?

The DS1245AB-100+ asserts unconditional write protection when V_CC falls within 4.50 V to 4.75 V. Below this range, all inputs become "don't care," outputs go high-impedance, and the lithium source automatically engages at ~3.0 V-preventing data corruption during brownout conditions without firmware intervention.

Is DS1245AB-100+ pin-compatible with standard 128k × 8 SRAMs?

Yes, the DS1245AB-100+ uses a JEDEC-standard 32-pin Extended DIP (740-mil) footprint with identical pinout to legacy 128k × 8 volatile SRAMs. Address (A0–A16), data (DQ0–DQ7), and control (CE, WE, OE, V_CC, GND) signals map directly-enabling drop-in replacement without PCB redesign.

What temperature range is specified for DS1245AB-100+?

The DS1245AB-100+ is rated for commercial operation from 0°C to +70°C. It is not qualified for industrial temperature range (−40°C to +85°C); that variant is designated DS1245AB-100IND+. All DC and AC electrical characteristics-including 70 ns access time and 50–150 µA standby current-are guaranteed across the 0°C to +70°C range.

DS1245AB-100+ 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:: 100ns

Access Time:: 100 ns

Voltage - Supply:: 4.75V ~ 5.25V

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 32-EDIP

DS1245AB-100+ FAQ

1.How can I place an order for DS1245AB-100+ through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1245AB-100+ 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-100+ reliable?

The price and inventory of DS1245AB-100+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1245AB-100+ is usually 5 days.

3.What payment methods are accepted for DS1245AB-100+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1245AB-100+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1245AB-100+?

DS1245AB-100+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1245AB-100+ 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-100+?

For technical support, including DS1245AB-100+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1245AB-100+ requirements.

6.How does Aetrix verify that DS1245AB-100+ is sourced from the original manufacturer or authorized distributors?

All DS1245AB-100+ 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-100+ meets industry standards.

7.What is the process for return or replacement of DS1245AB-100+?

All DS1245AB-100+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1245AB-100+, 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-100+ part is unused and in its original packaging.

Return procedure for DS1245AB-100+:

1.Submit a request within 90 days.

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

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