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Analog Devices Inc./Maxim Integrated DS1220AD-200IND+
- Part No.:
- DS1220AD-200IND+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- 24-DIP Module (0.600", 15.24mm)
- Datasheet:
-
DS1220AD-200IND+.pdf
- Description:
- IC NVSRAM 16KBIT PARALLEL 24EDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,736
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Product details
Overview
DS1220AD-200IND+ from Maxim Integrated (now Analog Devices) is a 16k nonvolatile static RAM organized as 2048 × 8 bits, featuring lithium-backed data retention, automatic write protection during power loss, and 100 ns read/write access time. It directly replaces volatile 2k × 8 SRAMs and EEPROMs in industrial control, metering, and legacy system memory upgrades.
For engineers reviewing the DS1220AD-200IND+ datasheet, DS1220AD-200IND+ pinout, DS1220AD-200IND+ application, or DS1220AD-200IND+ equivalent, key selection criteria include ±10% VCC tolerance, -40°C to +85°C operation, 10-year data retention without external power, and JEDEC-standard 24-pin extended DIP compatibility with 2716 EPROM and 2816 EEPROM footprints.
Technical Context
The DS1220AD-200IND+ integrates a self-contained lithium battery and voltage-monitoring circuitry that triggers automatic write protection when VCC falls below 4.25 V and switches to battery backup below ~3.0 V. Its CMOS architecture enables unlimited write cycles and eliminates need for external support circuitry.
It operates across full 4.5 V to 5.5 V supply range, supports standard microprocessor bus timing with tACC = 100 ns and tWC = 100 ns, and maintains high-impedance outputs during power transition events per UL E99151 recognition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 16,384-bit (2048 × 8), byte-wide parallel interface compatible with legacy 2k × 8 SRAM/EPROM designs |
| Access Time | 100 ns read/write - meets timing requirements of 8-bit and 16-bit microcontrollers running at ≤10 MHz |
| VCC Range | 4.5 V to 5.5 V (±10%) - accommodates wide-input industrial power rails without regulation |
| Data Retention | 10 years minimum without external power - guaranteed by internal lithium cell and freshness seal activation on first power-up |
| Operating Temp | -40°C to +85°C (IND grade) - qualified for uncontrolled industrial environments including energy meters and PLC modules |
| Write Cycles | Unlimited - no wear-out mechanism; eliminates EEPROM endurance limitations in frequent-write applications |
| Package | 24-pin 720-mil extended DIP - direct drop-in replacement for 2716 EPROM and 2816 EEPROM sockets |
Pinout & Package
DS1220AD-200IND+ uses a JEDEC-standard 24-pin extended dual in-line package (EDIP), 720 mil width, RoHS-compliant with lead-free finish (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address Inputs | 11-bit address bus for selecting one of 2048 memory locations; TTL-compatible inputs |
| DQ0–DQ7 | Data I/O | Bidirectional 8-bit data bus; high-impedance when CE or OE inactive |
| CE | Chip Enable | Active-low chip select; disables outputs and reduces standby current when high |
| WE | Write Enable | Active-low write strobe; controls write cycle initiation and output disable timing (tODW = 35 ns) |
| OE | Output Enable | Active-low output enable; allows read access while WE is high to prevent bus contention |
| VCC | Power Supply | +5 V supply input; powers logic and enables lithium disconnect circuitry on first power application |
| GND | Ground | Reference return path for all signals and internal battery switching circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-Fail Protection | Monitors VCC continuously; triggers unconditional write protect and battery switchover below ~3.0 V to prevent corruption |
| Freshness Seal Activation | Lithium source remains electrically disconnected until first VCC > VTP (4.25 V), preserving full 10-year retention capacity |
| Direct EPROM/EEPROM Replacement | Pins match 2716 EPROM and 2816 EEPROM - no PCB redesign needed for memory upgrades |
| Wide VCC Tolerance | ±10% operating range (4.5 V–5.5 V) - supports brownout-prone industrial supplies without external regulators |
| UL Recognition | Recognized under UL File E99151 - validates safety compliance for use in certified industrial equipment |
Applications
| Industrial Energy Metering | Legacy PLC Memory Backup |
|---|---|
Use Scenario: Storing tariff tables, consumption logs, and firmware configuration in electricity meters exposed to wide ambient temperature swings and intermittent grid power. IC Role / Device Role / Timing Role: Nonvolatile memory holding critical calibration and billing data; retains content during grid outages without supercapacitor or external battery. Use Value: Eliminates need for external backup power management circuitry while guaranteeing 10-year data integrity per ANSI C12.1 and IEC 62056 standards. | Use Scenario: Replacing aging 2716 EPROMs in programmable logic controller CPU modules where firmware updates occur infrequently but data must survive power cycling. IC Role / Device Role / Timing Role: Pin-compatible nonvolatile program/data storage with SRAM-speed access and zero write endurance limit. Use Value: Enables field firmware patching via standard microcontroller bus without requiring socket adapters or layout changes. |
| Medical Device Configuration Storage | Avionics Data Logger Buffer |
Use Scenario: Holding device-specific calibration coefficients, user preferences, and audit trails in portable diagnostic instruments operating in clinical environments with variable AC/DC power sources. IC Role / Device Role / Timing Role: Industrial-grade NV SRAM providing tamper-resistant, low-power configuration storage with guaranteed retention across thermal cycling. Use Value: Meets IEC 62304 Class B software requirements for persistent data integrity without battery maintenance or periodic refresh. | Use Scenario: Capturing flight parameter snapshots in black-box recorders where transient power interruptions are common during engine start or electrical fault conditions. IC Role / Device Role / Timing Role: High-reliability buffer memory that autonomously preserves last valid data frame upon voltage collapse. Use Value: Ensures crash data recovery even after complete main bus failure, satisfying DO-178C traceability for critical flight data retention. |
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 V–5.25 V); higher write-protection threshold (4.5 V vs. 4.25 V) | Better suited for stable 5 V ±5% supplies; less tolerant of brownout conditions | Select when system regulation ensures tight VCC stability and higher VTP improves noise immunity |
| MAX6900AEE+T | Serial I²C interface; 16 kbit EEPROM architecture; no internal battery; 1M write cycles | Requires software-driven protocol handling; slower random access; no autonomous power-fail response | Choose for space-constrained designs needing serial interface and lower pin count, accepting trade-offs in speed and fail-safe behavior |
Compared with DS1220AB-100IND+, the DS1220AD-200IND+ offers wider supply tolerance and earlier write-protection activation, improving robustness in fluctuating industrial rails; versus MAX6900AEE+T, it delivers parallel-bus speed, unlimited writes, and hardware-level power-loss immunity-critical for real-time data capture.
Availability
DS1220AD-200IND+ is available at Aetrix Electronics and suitable for industrial energy metering, legacy PLC memory upgrades, and medical device configuration storage requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for DS1220AD-200IND+ 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-200IND+ belongs to Maxim's nonvolatile memory product line, engineered specifically for systems requiring autonomous, battery-backed SRAM functionality without external supervision or firmware intervention.
FAQ
What is the guaranteed data retention period for DS1220AD-200IND+ without external power?
The DS1220AD-200IND+ guarantees a minimum 10-year data retention period in the absence of external power, based on its integrated lithium energy source and freshness seal that preserves full battery capacity until first power application. This retention time is defined as cumulative time without VCC, starting from initial power-up, and is validated by design-not 100% tested per unit.
Does DS1220AD-200IND+ require external circuitry to manage battery backup?
No, DS1220AD-200IND+ requires no external circuitry for battery backup operation. Its internal control circuitry automatically monitors VCC, disconnects the lithium source until first power application, and switches to battery power when VCC drops below ~3.0 V. Write protection engages unconditionally below 4.25 V, ensuring data integrity without host intervention.
Is DS1220AD-200IND+ pin-compatible with standard 2716 EPROMs?
Yes, DS1220AD-200IND+ matches the pinout of the 2716 EPROM and 2816 EEPROM, enabling direct substitution in existing 24-pin DIP sockets. Its A0–A10, DQ0–DQ7, CE, OE, WE, VCC, and GND assignments align exactly-no PCB modification or adapter is required for retrofitting legacy systems.
What is the operating temperature range specified for DS1220AD-200IND+?
The DS1220AD-200IND+ is rated for industrial temperature operation from -40°C to +85°C, as indicated by the "IND" suffix. All DC and AC electrical characteristics-including 100 ns access time, ±10% VCC tolerance, and write protection thresholds-are fully specified and guaranteed across this full range.
How does DS1220AD-200IND+ handle power-up and power-down transitions?
During power-down, DS1220AD-200IND+ detects VCC decay via internal monitoring, activates write protection at 4.25 V, and switches to lithium backup below ~3.0 V within 1.5 µs. At power-up, it reconnects VCC to the RAM array and isolates the battery once VCC exceeds ~3.0 V, resuming normal operation after VCC stabilizes above 4.5 V.
DS1220AD-200IND+ 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:
- 200ns
- Access Time:
- 200 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-200IND+ FAQ
1.How can I place an order for DS1220AD-200IND+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1220AD-200IND+ 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-200IND+ reliable?
The price and inventory of DS1220AD-200IND+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1220AD-200IND+ is usually 5 days.
3.What payment methods are accepted for DS1220AD-200IND+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1220AD-200IND+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1220AD-200IND+?
DS1220AD-200IND+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1220AD-200IND+ 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-200IND+?
For technical support, including DS1220AD-200IND+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1220AD-200IND+ requirements.
6.How does Aetrix verify that DS1220AD-200IND+ is sourced from the original manufacturer or authorized distributors?
All DS1220AD-200IND+ 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-200IND+ meets industry standards.
7.What is the process for return or replacement of DS1220AD-200IND+?
All DS1220AD-200IND+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1220AD-200IND+, 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-200IND+ part is unused and in its original packaging.
Return procedure for DS1220AD-200IND+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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