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

Analog Devices Inc./Maxim Integrated DS1220AB-100

Name: DS1220AB-100
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1220AB-100
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1220AB-100

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Memory

Package:: 24-DIP Module (0.600", 15.24mm)

Datasheet:: DS1220AB-100.pdf

Description:: IC NVSRAM 16KBIT PARALLEL 24EDIP

Quantity:: RFQ Add To RFQ list

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Inventory:3,165

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Product details

Overview

DS1220AB-100 from Maxim Integrated (formerly Dallas Semiconductor) is a 16k nonvolatile static RAM organized as 2048 × 8 bits, featuring lithium-backed data retention, 100 ns read/write access time, ±5% V_CC tolerance (4.75–5.25 V), and industrial temperature support (-40°C to +85°C). It directly replaces volatile 2k × 8 SRAMs in battery-backed memory systems for embedded controllers and data loggers.

For engineers reviewing the DS1220AB-100 datasheet, DS1220AB-100 pinout, DS1220AB-100 application, or DS1220AB-100 equivalent, key selection criteria include guaranteed 10-year data retention without external power, automatic write protection during V_CC decay, unlimited write cycles, JEDEC-standard 24-pin EDIP package compatibility, and seamless substitution for 2716 EPROM/2816 EEPROM footprints.

Technical Context

The DS1220AB-100 integrates on-die lithium battery switching circuitry that monitors V_CC continuously; when voltage drops below 4.5 V (V_TP), it disables inputs, places outputs in high-Z, and connects the lithium source to retain RAM contents. Power-up sequencing requires V_CC to exceed ~3.0 V before disconnecting the battery and restoring normal operation above 4.75 V.

Its timing architecture supports asynchronous parallel interface with independent CE/OE/WE control: read cycles require CE and OE low with WE high; write cycles require CE and WE low while OE is high; address setup (t_AW = 0 ns) and data hold (t_DH1 = 0 ns) impose minimal bus timing constraints, enabling direct microprocessor interfacing without glue logic.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	2048 words × 8 bits - matches standard 2k × 8 SRAM footprint and addressing scheme
Access Time	100 ns - enables direct connection to 10 MHz bus systems without wait states
V_CC Range	4.75 V to 5.25 V (±5%) - ensures stable operation across typical 5 V rail tolerances
Data Retention	10 years without power - guaranteed by internal lithium cell and automatic backup switching
Write Protection Threshold	V_TP = 4.5 V to 4.75 V - triggers unconditional write lock before data corruption occurs
Operating Temperature	-40°C to +85°C (IND grade) - qualified for industrial control and automotive under-hood environments
Package	24-pin 720-mil Extended DIP (EDIP) - JEDEC-compliant, wave-solderable, drop-in replacement for 2716/2816

Pinout & Package

DS1220AB-100 uses a 24-pin 720-mil Extended Dual In-line Package (EDIP), RoHS-compliant (indicated by '+' suffix), rated for wave or hand soldering only (lead temp ≤ +260°C for 10 s).

Pin/Terminal	Circuit Role	Design Meaning
A0–A10	Address Inputs	11-bit address bus supporting full 2048-word addressing; TTL-compatible input thresholds
DQ0–DQ7	Data I/O	Bidirectional 8-bit data bus with 2 mA sink / 1 mA source drive capability
CE	Chip Enable	Active-low chip select; controls device enable and participates in write cycle timing (t_WC, t_WR)
WE	Write Enable	Active-low write strobe; determines write start/stop edges with CE; disables outputs when asserted during reads
OE	Output Enable	Active-low output control; must be high during writes to prevent bus contention
V_CC	Power Supply	+5 V ±5% supply; powers logic and enables lithium disconnect until first power-on
GND	Ground	Reference return path for all signals and internal switching circuitry

Key Features

Feature	Design Value
Automatic Power-Fail Detection & Switching	Monitors V_CC continuously; switches to lithium backup within 1.5 µs of V_TP breach, eliminating need for external supervisor ICs
Unlimited Write Cycles	No endurance limit on write operations - eliminates wear-leveling firmware overhead required for EEPROM/Flash
Freshness Seal	Lithium cell electrically disconnected at shipment; full energy capacity preserved until first V_CC application > V_TP
Direct Pin Compatibility	Matches 24-pin DIP pinout of 2716 EPROM and 2816 EEPROM - enables hardware reuse without PCB redesign
Industrial Temperature Rating	Qualified from -40°C to +85°C - supports deployment in programmable logic controllers and remote telemetry units

Applications

Industrial Data Logger	PLC Configuration Memory
Use Scenario: Long-term environmental sensor data capture in unattended field deployments with intermittent power. IC Role / Device Role / Timing Role: Nonvolatile RAM storing timestamped readings; retains data across seasonal power outages. Use Value: Eliminates need for external battery management or supercapacitor circuits while guaranteeing 10-year retention.	Use Scenario: Storing ladder logic configuration and I/O mapping in programmable logic controllers subject to brownouts. IC Role / Device Role / Timing Role: System-critical configuration storage with automatic write protection triggered by V_CC sag. Use Value: Prevents corrupted configuration writes during power transitions, ensuring deterministic PLC restart behavior.
Medical Device Event Recorder	Avionics Black Box Buffer
Use Scenario: Capturing diagnostic events and fault codes in portable ultrasound or infusion pumps with no backup power infrastructure. IC Role / Device Role / Timing Role: Volatile SRAM replacement holding last 1000+ operational events; powered solely by main 5 V rail. Use Value: Provides certified data integrity without adding external power sources or increasing BOM count.	Use Scenario: Buffering flight parameter streams in aircraft monitoring systems where EMI and thermal cycling are severe. IC Role / Device Role / Timing Role: High-reliability memory buffer operating across -40°C to +85°C with zero write-cycle limits. Use Value: Meets DO-160 environmental requirements while supporting continuous high-speed logging without wear degradation.

Industrial Data Logger

PLC Configuration Memory

Use Scenario: Long-term environmental sensor data capture in unattended field deployments with intermittent power.

IC Role / Device Role / Timing Role: Nonvolatile RAM storing timestamped readings; retains data across seasonal power outages.

Use Value: Eliminates need for external battery management or supercapacitor circuits while guaranteeing 10-year retention.

Use Scenario: Storing ladder logic configuration and I/O mapping in programmable logic controllers subject to brownouts.

IC Role / Device Role / Timing Role: System-critical configuration storage with automatic write protection triggered by V_CC sag.

Use Value: Prevents corrupted configuration writes during power transitions, ensuring deterministic PLC restart behavior.

Medical Device Event Recorder

Avionics Black Box Buffer

Use Scenario: Capturing diagnostic events and fault codes in portable ultrasound or infusion pumps with no backup power infrastructure.

IC Role / Device Role / Timing Role: Volatile SRAM replacement holding last 1000+ operational events; powered solely by main 5 V rail.

Use Value: Provides certified data integrity without adding external power sources or increasing BOM count.

Use Scenario: Buffering flight parameter streams in aircraft monitoring systems where EMI and thermal cycling are severe.

IC Role / Device Role / Timing Role: High-reliability memory buffer operating across -40°C to +85°C with zero write-cycle limits.

Use Value: Meets DO-160 environmental requirements while supporting continuous high-speed logging without wear degradation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS1220AD-100IND+	Wider V_CC tolerance (±10%, 4.5–5.5 V); lower V_TP (4.25–4.5 V)	Better suited for systems with noisy or poorly regulated 5 V rails	Select DS1220AD-100IND+ if supply stability is marginal; DS1220AB-100IND+ preferred for clean, tightly regulated 5 V designs
STK12C68-AI55	Same 16k × 8 organization, 100 ns access, but uses external battery and lacks integrated switch	Requires external lithium coin cell and discrete power-fail detection circuitry	Choose STK12C68-AI55 only if legacy board layout mandates external battery placement or cost sensitivity outweighs integration benefit

Compared with DS1220AD-100IND+, the DS1220AB-100IND+ offers tighter V_CC regulation margin and higher write-protection threshold, improving noise immunity in stable power environments; versus STK12C68-AI55, DS1220AB-100IND+ reduces component count by integrating battery switching and monitoring, lowering design risk and board area.

Availability

DS1220AB-100 is available at Aetrix Electronics and suitable for industrial data loggers, programmable logic controllers, medical event recorders, and avionics black box buffers requiring stable component supply, long-life data retention, and drop-in compatibility with legacy 24-pin DIP memory sockets.

Supply support for DS1220AB-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 (acquired by Analog Devices in 2021) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and high-reliability power management solutions.

The DS1220AB-100 belongs to Maxim's legacy nonvolatile SRAM product line, designed specifically for mission-critical memory backup in industrial, medical, and aerospace systems where data integrity during power loss is non-negotiable.

FAQ

What is the guaranteed data retention period for DS1220AB-100 when external power is removed?

The DS1220AB-100 guarantees 10 years of data retention in the absence of external power, based on its integrated lithium energy source and internal power-switching circuitry. This specification is defined as cumulative time without V_CC, beginning after first application of power, and is ensured by design-not 100% tested per unit. The DS1220AB-100 achieves this without external capacitors or support components.

Does DS1220AB-100 require external circuitry to detect power failure and initiate backup?

No, the DS1220AB-100 contains fully integrated power-fail monitoring and lithium switching circuitry. It autonomously detects V_CC decay below 4.5 V (V_TP), disables all inputs, places outputs in high-Z, and connects the internal lithium cell within 1.5 µs-no external supervisor IC, resistors, or capacitors are needed. This self-contained behavior is intrinsic to the DS1220AB-100 design.

Can DS1220AB-100 be used as a direct replacement for 2716 EPROM or 2816 EEPROM in existing PCB layouts?

Yes, the DS1220AB-100 uses the identical 24-pin 720-mil EDIP package and matches the pinout of both the 2716 EPROM and 2816 EEPROM. Its CE/OE/WE interface and 2048 × 8 organization allow direct substitution without PCB modification, while delivering faster 100 ns access and unlimited write cycles-unlike EPROM (UV-erase limited) or EEPROM (endurance-limited).

What is the operating voltage range and tolerance specification for DS1220AB-100?

The DS1220AB-100 operates over a V_CC range of 4.75 V to 5.25 V, corresponding to a ±5% tolerance around nominal 5 V. Full functional operation-including read, write, and automatic backup switching-is guaranteed across this range. Write protection activates at V_TP = 4.5 V to 4.75 V, providing a 250 mV safety margin before data corruption risk.

Is DS1220AB-100 qualified for industrial temperature operation?

Yes, the DS1220AB-100IND+ variant is fully qualified for industrial temperature operation from -40°C to +85°C, as confirmed in the Ordering Information table and Absolute Maximum Ratings section. This rating applies to all DC and AC electrical characteristics, including 100 ns access time and 10-year data retention, making the DS1220AB-100 suitable for harsh-environment applications like factory automation and outdoor instrumentation.

DS1220AB-100 Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 24-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:: 16Kbit

Memory Organization:: 2K 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:: 24-EDIP

DS1220AB-100 FAQ

1.How can I place an order for DS1220AB-100 through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1220AB-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 DS1220AB-100 reliable?

The price and inventory of DS1220AB-100 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1220AB-100 is usually 5 days.

3.What payment methods are accepted for DS1220AB-100?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1220AB-100 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1220AB-100?

DS1220AB-100 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1220AB-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 DS1220AB-100?

For technical support, including DS1220AB-100 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1220AB-100 requirements.

6.How does Aetrix verify that DS1220AB-100 is sourced from the original manufacturer or authorized distributors?

All DS1220AB-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 DS1220AB-100 meets industry standards.

7.What is the process for return or replacement of DS1220AB-100?

All DS1220AB-100 units undergo pre-shipment inspection (PSI). If there is an issue with DS1220AB-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 DS1220AB-100 part is unused and in its original packaging.

Return procedure for DS1220AB-100:

1.Submit a request within 90 days.

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

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