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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:771
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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 integrated lithium battery backup, automatic power-loss write protection, and 100 ns read/write access time. It directly replaces volatile 2k × 8 SRAMs and EEPROMs in industrial control memory retention applications requiring data integrity across power cycles.
For engineers reviewing the DS1220AD-100IND+ datasheet, DS1220AD-100IND+ pinout, DS1220AD-100IND+ application, or DS1220AD-100IND+ equivalent, key selection criteria include its ±10% VCC tolerance, -40°C to +85°C industrial temperature rating, JEDEC-standard 24-pin extended DIP package, and guaranteed 10-year data retention without external power.
Technical Context
The DS1220AD-100IND+ implements a self-contained power-fail detection circuit that monitors VCC continuously; when voltage drops below 4.25 V (VTP), it disables all inputs, places outputs in high-impedance state, and switches to internal lithium power within 1.5 µs. Its CMOS architecture supports unlimited write cycles with no wear leveling or erase overhead.
It maintains full compatibility with standard microprocessor bus timing: CE and OE active-low enable read access, while WE and CE active-low initiate writes. The device matches the pinout of 2716 EPROM and 2816 EEPROM, enabling drop-in replacement in legacy systems without layout changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 16,384-bit (2048 × 8), directly substituting 2k × 8 SRAM/EEPROM in existing designs |
| Access Time | 100 ns read/write - meets real-time embedded system timing budgets for 8-bit microcontrollers |
| VCC Range | 4.5 V to 5.5 V (±10%) - accommodates wide-input industrial power rails without regulation |
| Data Retention | 10 years minimum without power - ensures long-term firmware or calibration storage in unpowered equipment |
| Operating Temp | -40°C to +85°C - qualified for industrial automation, metering, and transportation electronics |
| Write Cycles | Unlimited - eliminates endurance concerns in high-frequency logging or configuration update scenarios |
| Package | 24-pin 720-mil extended DIP - compatible with through-hole PCB assembly and legacy socket footprints |
Pinout & Package
DS1220AD-100IND+ uses a JEDEC-standard 24-pin encapsulated extended DIP (720-mil width) package with gold-plated leads and RoHS-compliant finish.
| 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 when CE or OE inactive |
| CE | Chip Enable | Active-low global chip select; initiates read/write when low with valid address |
| WE | Write Enable | Active-low write strobe; controls data latching during write cycle |
| OE | Output Enable | Active-low output driver control; enables data bus drivers only during reads |
| VCC | Power Supply | +5 V supply input; powers logic and triggers lithium source activation on first power-up |
| GND | Ground | Reference return path for all signals and internal switching circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-Fail Protection | Switches to lithium backup within 1.5 µs when VCC falls below 4.25 V, preventing corruption during brownouts |
| Freshness Seal | Lithium cell remains electrically disconnected until first VCC application > VTP, preserving full 10-year capacity |
| Full VCC Tolerance | Operates across ±10% VCC (4.5–5.5 V), eliminating need for tight-regulation power supplies |
| Pinout Compatibility | Matches 2716 EPROM and 2816 EEPROM pin assignments, enabling direct hardware substitution |
| Industrial Temperature Rating | Qualified from -40°C to +85°C per JEDEC JESD22-A108, supporting harsh-environment deployments |
Applications
| Industrial Data Logger | Energy Meter Firmware Storage |
|---|---|
Use Scenario: Continuous recording of sensor readings in remote substations with intermittent grid power. IC Role / Device Role / Timing Role: Nonvolatile memory holding last-valid measurement and timestamp during AC loss. Use Value: Guarantees 10-year data retention without supercapacitors or external battery management circuitry. | Use Scenario: Storing tariff tables, calibration coefficients, and billing history in smart electricity meters. IC Role / Device Role / Timing Role: Direct-replacement NV SRAM interfacing with 8-bit MCU via standard parallel bus. Use Value: Eliminates EEPROM write delays and endurance limits while maintaining pin-compatible upgrade path. |
| PLC Configuration Memory | Medical Device Calibration Storage |
Use Scenario: Retaining ladder logic parameters and I/O mapping in programmable logic controllers after shutdown. IC Role / Device Role / Timing Role: Parallel-interface nonvolatile RAM accessed during boot initialization and runtime updates. Use Value: Supports unlimited field reconfiguration without degradation, critical for maintenance-intensive factory automation. | Use Scenario: Preserving sensor offset/gain values and safety-critical calibration data in portable diagnostic equipment. IC Role / Device Role / Timing Role: Battery-backed memory ensuring traceable calibration persistence across sterilization cycles and battery swaps. Use Value: Meets IEC 62304 software lifecycle requirements for data integrity without external supervision. |
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+ | ±5% VCC tolerance (4.75–5.25 V); higher write-protection threshold (4.5 V) | Better suited for tightly regulated 5 V systems where voltage stability is guaranteed | Select DS1220AB-100IND+ when power supply ripple is < ±2.5% and system cannot tolerate lower VTP |
| STK12C68-55I | 55 ns access time; 32k × 8 organization; different pinout (28-pin SOIC) | Requires PCB redesign; targets higher-speed, higher-density applications with surface-mount constraints | Choose STK12C68-55I only if faster access and larger capacity outweigh footprint and layout change costs |
Compared with DS1220AB-100IND+, the DS1220AD-100IND+ offers wider VCC tolerance for less-regulated industrial rails, while STK12C68-55I provides speed and density at the cost of mechanical and electrical incompatibility.
Availability
DS1220AD-100IND+ is available at Aetrix Electronics and suitable for industrial data loggers, energy meter firmware storage, and PLC configuration memory requiring stable component supply across extended product lifecycles.
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 DS1220 family was engineered specifically for mission-critical nonvolatile memory replacement in legacy 8-bit systems where data integrity during power interruption is non-negotiable.
FAQ
What is the guaranteed data retention period for DS1220AD-100IND+?
The DS1220AD-100IND+ guarantees a minimum of 10 years of data retention in the absence of external power, measured from the time VCC is first applied. This specification is design-guaranteed and applies across the full -40°C to +85°C operating range, with the lithium energy source remaining sealed until initial power-up to preserve capacity.
Does DS1220AD-100IND+ require external circuitry for battery backup operation?
No, DS1220AD-100IND+ requires no external circuitry for battery backup operation. Its integrated lithium cell and power-fail detection circuitry automatically switch to backup power when VCC drops below 4.25 V, and disconnect the battery during normal operation to prevent self-discharge - all functions are fully self-contained within the DS1220AD-100IND+ package.
Is DS1220AD-100IND+ pin-compatible with standard 24-pin EPROMs?
Yes, DS1220AD-100IND+ is pin-compatible with the 2716 EPROM and 2816 EEPROM, sharing identical pin assignments for address, data, CE, OE, WE, VCC, and GND. This allows direct hardware substitution in existing sockets without PCB modification, preserving legacy system compatibility while upgrading to nonvolatile SRAM functionality.
What is the write protection voltage threshold for DS1220AD-100IND+?
The write protection voltage threshold (VTP) for DS1220AD-100IND+ is specified as 4.25 V (min) to 4.5 V (max). When VCC falls below this threshold during power-down, the DS1220AD-100IND+ immediately disables write capability, places all outputs in high-impedance state, and activates lithium backup - ensuring zero risk of data corruption during brownout conditions.
Can DS1220AD-100IND+ operate across the full industrial temperature range?
Yes, DS1220AD-100IND+ is fully qualified for continuous operation from -40°C to +85°C, as confirmed by JEDEC JESD22-A108 testing. All DC and AC electrical specifications - including 100 ns access time, ±10% VCC tolerance, and 10-year data retention - are guaranteed across this full industrial temperature range.
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:
- 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:
- -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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