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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:4,105
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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 factors include its ±10% VCC tolerance, -40°C to +85°C industrial temperature rating, 10-year data retention without external power, and JEDEC-standard 24-pin extended DIP package 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–5.5 V supply range, supports standard parallel bus timing with tACC = 100 ns and tWC = 100 ns, and maintains high-impedance outputs during power transition events per tPD = 1.5 µs fail-detect latency and tREC = 125 ms recovery after VCC restoration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 16,384-bit (2048 × 8), byte-wide parallel interface compatible with legacy microprocessor buses |
| Access Time | 100 ns read/write - meets timing requirements of 8/16-bit systems running at ≤10 MHz |
| VCC Range | 4.5 V to 5.5 V (±10%) - supports wide-input industrial power rails without regulation |
| Data Retention | 10 years minimum without external power - enabled by sealed lithium cell and automatic disconnect freshness seal |
| Operating Temp | -40°C to +85°C - qualified for industrial environments including energy meters and factory automation |
| Write Protection Threshold | VTP = 4.25 V to 4.5 V - initiates unconditional write lock before data corruption risk occurs |
| 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, with through-hole mounting and wave/hand-solder compatible leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address Inputs | 11-bit address bus supporting full 2048-word addressing; TTL-compatible inputs |
| DQ0–DQ7 | Data I/O | Bidirectional 8-bit data bus; high-impedance when CE/OE inactive or during power transition |
| CE | Chip Enable | Active-low chip select; controls device enable and participates in write cycle timing (tWP, tWR) |
| WE | Write Enable | Active-low write strobe; determines write start/stop edges and disables outputs during writes (tODW) |
| OE | Output Enable | Active-low output control; enables data drivers only during reads; must be high during writes to avoid contention |
| VCC | Power Supply | +5 V supply input; monitored continuously for out-of-tolerance detection and battery switchover |
| GND | Ground | Reference return path for all signals and internal lithium circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-Fail Write Protection | Hardware-level VCC monitoring triggers unconditional write lock before data corruption - no firmware or external logic required |
| Lithium Freshness Seal | Lithium cell electrically disconnected until first VCC application > VTP, preserving full 10-year retention capacity at shipment |
| Unlimited Write Cycles | No endurance limit on write operations - eliminates wear-leveling firmware overhead and lifetime estimation complexity |
| Direct EPROM/EEPROM Replacement | Pins match 2716 (UV-erasable) and 2816 (electrically erasable) devices - enables plug-in upgrade without PCB redesign |
| Wide VCC Tolerance | ±10% operation (4.5 V–5.5 V) accommodates unregulated industrial supplies and brown-out conditions without reset circuitry |
Applications
| Industrial Energy Metering | Legacy Industrial PLC Memory |
|---|---|
Use Scenario: Storing tariff schedules, consumption logs, and calibration constants in smart electricity meters operating in unattended outdoor cabinets. IC Role / Device Role / Timing Role: Nonvolatile memory holding critical billing data across frequent AC line interruptions and seasonal power outages. Use Value: Guarantees 10-year data integrity without supercapacitors or backup batteries, reducing BOM cost and field failure risk. | Use Scenario: Replacing aging 2716 EPROMs in programmable logic controller (PLC) CPU modules where firmware and configuration must survive power cycling. IC Role / Device Role / Timing Role: Pin-compatible NV SRAM providing instant-read capability and in-system reprogrammability without UV erasure or programming voltage. Use Value: Enables field firmware updates via serial port while retaining full memory contents during hot-swap and brown-out events. |
| Avionics Data Recorders | Medical Diagnostic Equipment |
Use Scenario: Capturing flight parameter snapshots in black box recorders subjected to extreme thermal cycling and vibration. IC Role / Device Role / Timing Role: High-reliability memory buffer capturing real-time sensor data during transient power loss or emergency shutdown. Use Value: Meets DO-160 environmental compliance via -40°C to +85°C rating and guaranteed data retention under rapid VCC collapse (tPD = 1.5 µs). | Use Scenario: Storing patient calibration profiles and diagnostic settings in portable ultrasound and ECG units with intermittent battery operation. IC Role / Device Role / Timing Role: Battery-backed memory preserving user preferences and device configurations between clinical sessions. Use Value: Eliminates need for external backup power management ICs, simplifying FDA-cleared design and reducing leakage current in standby mode. |
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 tolerance (±5%, 4.75–5.25 V); higher write-protection threshold (4.5–4.75 V) | Better suited for regulated 5 V systems requiring tighter voltage margin control | Select DS1220AB-100IND+ when supply regulation is stable and VCC sag below 4.75 V is unlikely |
| STK12C68-AW50I | Same 16k × 8 organization but uses capacitor-based backup; 50 ns access time; SOIC-28 package | Lower profile, surface-mount alternative with faster access but shorter retention (up to 72 hours without power) | Choose STK12C68-AW50I for space-constrained designs where short-term backup suffices and reflow assembly is preferred |
Compared with DS1220AB-100IND+ and STK12C68-AW50I, DS1220AD-200IND offers broader supply tolerance and decade-long retention ideal for unregulated industrial environments, while trading off speed and package form factor for proven long-term reliability in through-hole legacy systems.
Availability
DS1220AD-200IND is available at Aetrix Electronics and suitable for industrial energy metering, legacy PLC memory upgrades, avionics data recorders, and medical diagnostic equipment requiring stable component supply across extended product lifecycles.
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 (acquired by Analog Devices in 2021) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The DS1220AB/AD family was designed to deliver drop-in nonvolatile memory solutions for legacy systems needing reliable, low-maintenance data retention without redesign - targeting applications where EEPROM endurance or battery-backed SRAM complexity were unacceptable.
FAQ
What is the guaranteed data retention period for DS1220AD-200IND?
The DS1220AD-200IND guarantees a minimum 10-year data retention period in the absence of external power, measured from the time VCC is first applied by the user. This is achieved via an integrated lithium energy source and automatic power-fail detection circuitry that preserves RAM contents without external components. The retention time is defined as cumulative time without VCC and is guaranteed by design, not 100% tested per unit.
Does DS1220AD-200IND require external circuitry for battery backup operation?
No, DS1220AD-200IND requires no external circuitry for battery backup operation. It contains a fully integrated lithium energy source and power-switching control circuitry that automatically monitors VCC, disconnects the battery until first power-up, and seamlessly transitions between main supply and backup power during brownouts. The device meets JEDEC 24-pin DIP standards and interfaces directly with standard microprocessor buses.
How does DS1220AD-200IND differ from DS1220AB-100IND+ in terms of voltage tolerance?
DS1220AD-200IND supports a wider VCC operating range of 4.5 V to 5.5 V (±10%), whereas DS1220AB-100IND+ operates from 4.75 V to 5.25 V (±5%). The DS1220AD-200IND also has a lower write-protection threshold (4.25–4.5 V vs. 4.5–4.75 V), making it more tolerant of unregulated or fluctuating power supplies commonly found in industrial environments.
Can DS1220AD-200IND be used as a direct replacement for 2716 EPROMs?
Yes, DS1220AD-200IND is pin-compatible with the 2716 EPROM and matches its 24-pin DIP footprint and signal assignments (A0–A10, DQ0–DQ7, CE, OE, VCC, GND). Unlike EPROMs, it requires no UV erasure or programming voltage and supports unlimited write cycles - enabling in-system firmware updates without socket removal or specialized programmers.
What is the meaning of "IND" in DS1220AD-200IND?
The "IND" suffix in DS1220AD-200IND denotes qualification for the industrial temperature range of -40°C to +85°C, as specified in the Absolute Maximum Ratings and DC/AC Electrical Characteristics tables. This rating ensures full functionality and guaranteed performance across harsh environments such as factory floors, outdoor utility installations, and transportation systems - distinct from commercial-grade variants rated for 0°C to +70°C.
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:
- 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:
- 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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