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Analog Devices Inc./Maxim Integrated DS1220AD-100IND
- Part No.:
- DS1220AD-100IND
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- 24-DIP Module (0.600", 15.24mm)
- Datasheet:
-
DS1220AD-100IND.pdf
- Description:
- IC NVSRAM 16KBIT PARALLEL 24EDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,764
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Product details
Overview
DS1220AD-100IND 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% VCC tolerance (4.5V–5.5V), and industrial temperature operation (–40°C to +85°C). It directly replaces volatile 2k × 8 SRAMs and EEPROMs in battery-backed memory applications such as real-time clock storage and configuration backup.
For engineers reviewing the DS1220AD-100IND datasheet, DS1220AD-100IND pinout, DS1220AD-100IND application, or DS1220AD-100IND equivalent, key selection criteria include guaranteed 10-year data retention without external power, automatic write protection during VCC dropout, JEDEC-standard 24-pin DIP compatibility, and seamless substitution for 2716 EPROM/2816 EEPROM footprints.
Technical Context
The DS1220AD-100IND integrates a self-contained lithium energy source with voltage-monitoring circuitry that triggers automatic switchover when VCC falls below 4.25 V (VTP), enabling uninterrupted data retention. Its CMOS architecture supports unlimited write cycles and requires no external support circuitry for microprocessor interfacing.
It operates across full ±10% VCC range (4.5V–5.5V), features tACC = 100 ns and tWC = 100 ns timing, and maintains high-impedance outputs and "don't care" inputs during power-down-ensuring system-level data integrity without software intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2048 words × 8 bits (16,384-bit NV SRAM) |
| Access Time | 100 ns - enables direct replacement of legacy 2k × 8 SRAMs in 80Cxx/68xxx bus systems |
| VCC Range | 4.5 V to 5.5 V (±10%) - accommodates wide-input power rails without regulation |
| Data Retention | ≥10 years without power - achieved via sealed lithium cell activated only on first power-up |
| Operating Temp | –40°C to +85°C (IND grade) - qualified for industrial control, metering, and telecom infrastructure |
| Write Protection Threshold | VTP = 4.25 V min - initiates automatic write lock before VCC reaches critical failure level |
| Package | 24-pin 720-mil extended DIP - JEDEC-compliant, compatible with 2716 EPROM and 2816 EEPROM sockets |
Pinout & Package
DS1220AD-100IND uses a 24-pin, 720-mil extended dual in-line package (EDIP) with through-hole mounting. The package includes internal lithium battery and voltage-monitoring circuitry sealed within the epoxy body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address Inputs | 11-bit address bus for selecting one of 2048 memory locations |
| DQ0–DQ7 | Data I/O | Bidirectional 8-bit data bus; high-impedance during write or deselection |
| CE | Chip Enable | Active-low chip select; controls device activation and output enable timing |
| WE | Write Enable | Active-low write strobe; determines write cycle start/termination with CE |
| OE | Output Enable | Active-low output control; disables drivers during writes to prevent bus contention |
| VCC | Power Supply | +5 V supply input; monitored continuously for write-protection triggering |
| GND | Ground | Reference return path for all signals and internal lithium circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-Fail Write Protection | Hardware-triggered at VTP = 4.25 V; eliminates need for external supervisor IC or firmware polling |
| Lithium Freshness Seal | Energy source electrically disconnected until first VCC application > VTP, preserving full 10-year retention capacity |
| Unlimited Write Cycles | No endurance limit - supports continuous logging, counter updates, or configuration writes without wear-out |
| Direct EPROM/EEPROM Replacement | PIN-compatible with 2716 (2K×8 EPROM) and 2816 (2K×8 EEPROM); same 24-pin DIP footprint and control logic |
| Zero-Support-Circuitry Interface | Standard TTL/CMOS levels; no external capacitors, regulators, or backup controllers required |
Applications
| Industrial Programmable Logic Controllers (PLCs) | Smart Electricity Meters |
|---|---|
Use Scenario: Storing calibration constants, tariff tables, and event logs across frequent power interruptions. IC Role / Device Role / Timing Role: Nonvolatile memory module retaining critical firmware parameters and usage history during mains dropout. Use Value: Eliminates supercapacitor or external battery management while guaranteeing ≥10-year data retention per ANSI C12.20 standards. | Use Scenario: Holding tamper-detection timestamps, meter serial numbers, and cryptographic keys in revenue-grade meters. IC Role / Device Role / Timing Role: Secure, self-powered memory node ensuring data persistence during battery replacement or grid failure. Use Value: Meets IEC 62056-21 requirements for unattended data integrity without external supervision circuitry. |
| Telecom Base Station Control Cards | Medical Diagnostic Equipment Configuration Storage |
Use Scenario: Preserving FPGA configuration bitstreams and alarm thresholds during scheduled maintenance outages. IC Role / Device Role / Timing Role: Fail-safe memory buffer maintaining operational state between hot-swap events and firmware updates. Use Value: Enables zero-downtime field upgrades by eliminating boot-time reinitialization of critical settings. | Use Scenario: Archiving user-defined scan protocols, calibration offsets, and regulatory compliance flags across equipment shutdowns. IC Role / Device Role / Timing Role: FDA-compliant nonvolatile storage for audit-trail-critical configuration data with deterministic retention. Use Value: Satisfies 21 CFR Part 11 electronic record requirements without adding external FRAM or EEPROM controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS1220AB-100IND+ | Narrower VCC range (4.75–5.25 V); higher write-protection threshold (4.5 V) | Better suited for stable 5 V regulated supplies; less tolerant of brownout conditions | Select DS1220AB-100IND+ only if system VCC remains tightly regulated above 4.75 V during all operating modes |
| MAX6900A–100IND+ | Serial I²C interface; 1 kbit EEPROM-based; no integrated lithium; external battery required | Lower pin count but requires host MCU firmware for write sequencing and voltage monitoring | Choose MAX6900A–100IND+ only when board space is constrained and I²C bus is available for memory access |
Compared with DS1220AB-100IND+, the DS1220AD-100IND offers wider supply tolerance and earlier write protection-critical for unregulated industrial rails. Against MAX6900A–100IND+, DS1220AD-100IND provides parallel interface speed, hardware autonomy, and guaranteed 10-year retention without external components.
Availability
DS1220AD-100IND is available at Aetrix Electronics and suitable for industrial programmable logic controllers, smart electricity meters, and telecom base station control cards requiring stable component supply, long-lifecycle assurance, and RoHS-compliant through-hole packaging.
Supply support for DS1220AD-100IND 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-100IND belongs to Maxim's nonvolatile SRAM product line, engineered to eliminate external backup circuitry while delivering deterministic data retention in harsh, intermittently powered environments.
FAQ
What is the guaranteed data retention period for DS1220AD-100IND?
The DS1220AD-100IND guarantees ≥10 years of data retention in the absence of external power, measured from the time VCC is first applied and the internal lithium cell is activated. This specification is design-guaranteed and applies across the full –40°C to +85°C industrial temperature range without derating.
Does DS1220AD-100IND require external circuitry to manage its lithium backup source?
No, DS1220AD-100IND requires no external circuitry. Its internal power-switching circuit automatically connects the lithium cell when VCC drops below 4.25 V and disconnects it during normal operation. The lithium source ships electrically isolated and activates only on first application of VCC > VTP.
Can DS1220AD-100IND be used as a drop-in replacement for 2716 EPROMs?
Yes, DS1220AD-100IND is pin-compatible and functionally compatible with the 2716 EPROM: identical 24-pin DIP footprint, matching A0–A10, DQ0–DQ7, CE, OE, and VCC/GND assignments, and compatible read timing. Unlike the 2716, DS1220AD-100IND supports unlimited writes and retains data without UV erasure.
What is the minimum VCC level at which DS1220AD-100IND initiates write protection?
The DS1220AD-100IND initiates automatic write protection when VCC falls to 4.25 V (VTP min), as specified in the DC Electrical Characteristics table. At this threshold, all inputs become "don't care," outputs go high-impedance, and the lithium source engages to preserve RAM contents.
Is DS1220AD-100IND RoHS-compliant and lead-free?
Yes, DS1220AD-100IND is RoHS-compliant and lead-free, indicated by the "+" suffix in the ordering code. It meets EU Directive 2011/65/EU and is manufactured with Pb-free terminations and halogen-free molding compound per Maxim's standard environmental compliance program.
DS1220AD-100IND 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-EDIP
DS1220AD-100IND FAQ
1.How can I place an order for DS1220AD-100IND through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1220AD-100IND 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-100IND reliable?
The price and inventory of DS1220AD-100IND are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1220AD-100IND is usually 5 days.
3.What payment methods are accepted for DS1220AD-100IND?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1220AD-100IND transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1220AD-100IND?
DS1220AD-100IND orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1220AD-100IND 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-100IND?
For technical support, including DS1220AD-100IND datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1220AD-100IND requirements.
6.How does Aetrix verify that DS1220AD-100IND is sourced from the original manufacturer or authorized distributors?
All DS1220AD-100IND 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-100IND meets industry standards.
7.What is the process for return or replacement of DS1220AD-100IND?
All DS1220AD-100IND units undergo pre-shipment inspection (PSI). If there is an issue with DS1220AD-100IND, 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-100IND part is unused and in its original packaging.
Return procedure for DS1220AD-100IND:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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