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

Analog Devices Inc./Maxim Integrated DS1220AD-100+

Name: DS1220AD-100+
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1220AD-100+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1220AD-100+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Memory

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

Datasheet:: DS1220AD-100+.pdf

Description:: IC NVSRAM 16KBIT PARALLEL 24EDIP

Quantity:: RFQ Add To RFQ list

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Inventory:114

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Product details

Overview

DS1220AD-100+ from Maxim Integrated (now Analog Devices) is a 16k nonvolatile static RAM organized as 2048 × 8 bits, featuring lithium-backed data retention, 100 ns read/write access time, ±10% V_CC tolerance (4.5V–5.5V), and JEDEC-standard 24-pin extended DIP package. It replaces volatile SRAM or EEPROM in battery-free memory hold applications such as industrial PLCs and legacy instrumentation.

For engineers reviewing the DS1220AD-100+ datasheet, DS1220AD-100+ pinout, DS1220AD-100+ application, or DS1220AD-100+ equivalent, key selection factors include guaranteed 10-year data retention without external power, automatic write protection during V_CC decay, unlimited write cycles, and direct compatibility with 2716 EPROM/2816 EEPROM footprints.

Technical Context

The DS1220AD-100+ integrates on-die lithium battery switching circuitry that monitors V_CC continuously; when voltage drops below 4.25 V (V_TP), it disables inputs, places outputs in high-Z, and connects the lithium source to retain RAM contents. Power-up sequencing ensures V_CC must exceed ~3.0 V before disconnecting the battery and resuming normal operation.

Its timing architecture supports asynchronous parallel interface operation with strict t_ACC = 100 ns, t_WC = 100 ns, and t_OE = 50 ns, while maintaining full functionality across 0°C to +70°C (commercial grade) and supporting both CE- and WE-controlled write initiation with overlapping or staggered edge sensitivity.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	2048 words × 8 bits - matches 2k × 8 SRAM/EPROM footprint for drop-in replacement
Access Time	100 ns - enables direct interfacing with 10 MHz bus systems without wait states
V_CC Range	4.5 V to 5.5 V (±10%) - accommodates wide-tolerance power supplies in industrial environments
Data Retention	10 years without power - achieved via sealed lithium cell and automatic V_CC-monitored backup switching
Write Protection Threshold	V_TP = 4.25 V (min) - triggers unconditional write lock before data corruption risk at low V_CC
Operating Temperature	0°C to +70°C - commercial-grade rating suitable for controlled-environment embedded systems
Package	24-pin 720-mil extended DIP - compatible with standard through-hole PCB assembly and socketing

Pinout & Package

DS1220AD-100+ uses a 24-pin extended dual in-line package (EDIP), 720 mil width, with industry-standard pin spacing and lead form for wave or hand soldering. Pin assignments are fully compatible with 2716 EPROM and 2816 EEPROM layouts.

Pin/Terminal	Circuit Role	Design Meaning
A0–A10	Address Inputs	11-bit address bus accepting 0–2047 for byte-select addressing of 2k memory space
DQ0–DQ7	Data I/O	Bidirectional 8-bit data bus; high-impedance when OE or CE inactive
CE	Chip Enable	Active-low chip select; controls device enable and participates in write cycle timing
WE	Write Enable	Active-low write strobe; falling edge initiates write, rising edge terminates it
OE	Output Enable	Active-low output control; enables data drivers only during read cycles
V_CC	Power Supply	+5 V supply input; monitored for voltage decay to trigger lithium backup activation
GND	Ground	Reference return path for all logic and memory circuits

Key Features

Feature	Design Value
Lithium freshness seal	Lithium cell remains electrically disconnected until first V_CC application > V_TP, preserving full 10-year capacity
Automatic power-fail response	Sub-3.0 V detection triggers <1.5 µs switch to battery backup and unconditional write protect
No external support circuitry	Self-contained voltage monitor, switch, and backup source eliminate need for external capacitors or controllers
Unlimited write endurance	CMOS SRAM core allows infinite write cycles-no wear-out mechanism like flash or EEPROM
Direct EPROM/EEPROM replacement	Pins A0–A10, DQ0–DQ7, CE, OE, WE, V_CC, GND match 2716/2816 layouts for zero-layout-change upgrade

Applications

Industrial Data Loggers	Legacy Industrial Controllers
Use Scenario: Continuous logging of sensor readings in unattended factory-floor equipment with intermittent or unreliable AC power. IC Role / Device Role / Timing Role: Nonvolatile memory buffer holding last valid state and timestamps during brownouts or scheduled shutdowns. Use Value: Eliminates need for supercapacitor-based backup or external NV memory controllers while guaranteeing 10-year data integrity.	Use Scenario: Maintaining configuration registers and runtime variables in aging programmable logic controllers (PLCs) originally designed for 2716 EPROMs. IC Role / Device Role / Timing Role: Drop-in SRAM replacement providing instant-write capability and no erase delays versus EPROM. Use Value: Enables field-upgradable firmware storage without hardware redesign or socket adapter.
Medical Diagnostic Instruments	Avionics Maintenance Recorders
Use Scenario: Storing calibration coefficients and fault history in portable ultrasound or ECG devices subject to frequent power cycling. IC Role / Device Role / Timing Role: Battery-backed RAM retaining critical settings across power removal and transport. Use Value: Avoids recalibration after each power-on, reducing service downtime and operator error.	Use Scenario: Capturing flight parameter snapshots in aircraft maintenance recorders where power may be interrupted during ground servicing. IC Role / Device Role / Timing Role: High-reliability memory holding last-flight data even if main bus voltage collapses mid-read. Use Value: Meets DO-160 Section 22 transient immunity requirements via sub-µs fail-safe switching.

Industrial Data Loggers

Legacy Industrial Controllers

Use Scenario: Continuous logging of sensor readings in unattended factory-floor equipment with intermittent or unreliable AC power.

IC Role / Device Role / Timing Role: Nonvolatile memory buffer holding last valid state and timestamps during brownouts or scheduled shutdowns.

Use Value: Eliminates need for supercapacitor-based backup or external NV memory controllers while guaranteeing 10-year data integrity.

Use Scenario: Maintaining configuration registers and runtime variables in aging programmable logic controllers (PLCs) originally designed for 2716 EPROMs.

IC Role / Device Role / Timing Role: Drop-in SRAM replacement providing instant-write capability and no erase delays versus EPROM.

Use Value: Enables field-upgradable firmware storage without hardware redesign or socket adapter.

Medical Diagnostic Instruments

Avionics Maintenance Recorders

Use Scenario: Storing calibration coefficients and fault history in portable ultrasound or ECG devices subject to frequent power cycling.

IC Role / Device Role / Timing Role: Battery-backed RAM retaining critical settings across power removal and transport.

Use Value: Avoids recalibration after each power-on, reducing service downtime and operator error.

Use Scenario: Capturing flight parameter snapshots in aircraft maintenance recorders where power may be interrupted during ground servicing.

IC Role / Device Role / Timing Role: High-reliability memory holding last-flight data even if main bus voltage collapses mid-read.

Use Value: Meets DO-160 Section 22 transient immunity requirements via sub-µs fail-safe switching.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS1220AB-100+	Narrower V_CC range (4.75–5.25 V); higher V_TP (4.5 V); same pinout and timing	Better suited for stable 5 V ±5% rails; less tolerant of brownout conditions near 4.5 V	Select DS1220AB-100+ when system power regulation meets tight ±5% spec and long-term retention is secondary to voltage margin
MAX6412A-100+	Successor generation with enhanced ESD rating (±8 kV HBM); identical 24-pin DIP footprint and 100 ns timing	RoHS-compliant and qualified for new designs requiring updated reliability specs; same temperature range	Choose MAX6412A-100+ for new production where long-term component availability and modern qualification are priorities

Compared with DS1220AB-100+, the DS1220AD-100+ offers wider supply tolerance for brownout resilience, while MAX6412A-100+ provides improved ESD robustness and lifecycle support-making DS1220AD-100+ optimal for legacy upgrades where voltage variation is expected, and MAX6412A-100+ preferred for new designs requiring extended manufacturability.

Availability

DS1220AD-100+ is available at Aetrix Electronics and suitable for industrial data loggers, legacy controller retrofits, and medical diagnostic instruments requiring stable component supply with guaranteed 10-year data retention and zero-battery-support design.

Supply support for DS1220AD-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 power management ICs for industrial, automotive, and communications applications.

The DS1220AD-100+ belongs to Maxim's nonvolatile SRAM product line, engineered to replace battery-equipped memory modules and EPROMs in systems where data persistence during power loss is mission-critical.

FAQ

What is the guaranteed data retention period for DS1220AD-100+ without external power?

The DS1220AD-100+ guarantees 10 years of data retention in the absence of external power, based on its integrated lithium energy source and self-contained voltage monitoring circuitry. This retention period begins after first application of V_CC and accumulates only during power-off intervals. The DS1220AD-100+ achieves this without external capacitors or support components, making it ideal for maintenance-free embedded memory applications.

Does DS1220AD-100+ require external circuitry to manage battery backup?

No, the DS1220AD-100+ requires no external circuitry for battery backup operation. Its internal control logic continuously monitors V_CC, automatically switches to the onboard lithium source when voltage falls below 4.25 V, and enforces unconditional write protection. The DS1220AD-100+ also features a freshness seal that keeps the lithium cell disconnected until first power-up, ensuring full capacity at deployment.

Can DS1220AD-100+ directly replace a 2716 EPROM in an existing design?

Yes, DS1220AD-100+ is pin-compatible with the 2716 EPROM and 2816 EEPROM, sharing identical 24-pin DIP pinout, address/data bus mapping, and control signal assignments (CE, OE, WE). Unlike EPROM, the DS1220AD-100+ supports instant writes without erase cycles, enabling real-time configuration updates while maintaining full backward compatibility in legacy sockets and PCB layouts.

What is the minimum V_CC level at which DS1220AD-100+ initiates write protection?

The DS1220AD-100+ initiates unconditional write protection when V_CC falls to 4.25 V (minimum specified V_TP). At this threshold, all inputs become "don't care," outputs go high-impedance, and the lithium backup source engages within 1.5 µs. This behavior is guaranteed across the full 0°C to +70°C operating range and ensures data integrity during gradual brownouts or power decay scenarios.

Is DS1220AD-100+ RoHS-compliant and lead-free?

Yes, DS1220AD-100+ is RoHS-compliant and lead-free, indicated by the "+" suffix in the part number. It meets EU Directive 2011/65/EU requirements and is manufactured with Pb-free terminations and compatible with standard lead-free reflow profiles. The DS1220AD-100+ retains full electrical and timing specifications under RoHS-compliant assembly conditions.

DS1220AD-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:: Active

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:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 24-EDIP

DS1220AD-100+ FAQ

1.How can I place an order for DS1220AD-100+ through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1220AD-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 DS1220AD-100+ reliable?

The price and inventory of DS1220AD-100+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1220AD-100+ is usually 5 days.

3.What payment methods are accepted for DS1220AD-100+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1220AD-100+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1220AD-100+?

DS1220AD-100+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1220AD-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 DS1220AD-100+?

For technical support, including DS1220AD-100+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1220AD-100+ requirements.

6.How does Aetrix verify that DS1220AD-100+ is sourced from the original manufacturer or authorized distributors?

All DS1220AD-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 DS1220AD-100+ meets industry standards.

7.What is the process for return or replacement of DS1220AD-100+?

All DS1220AD-100+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1220AD-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 DS1220AD-100+ part is unused and in its original packaging.

Return procedure for DS1220AD-100+:

1.Submit a request within 90 days.

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

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