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Analog Devices Inc./Maxim Integrated DS1220AD-200
- Part No.:
- DS1220AD-200
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- 24-DIP Module (0.600", 15.24mm)
- Datasheet:
-
DS1220AD-200.pdf
- Description:
- IC NVSRAM 16KBIT PARALLEL 24EDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,593
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Product details
Overview
DS1220AD-200 from Maxim Integrated (formerly Dallas Semiconductor) is a 16k nonvolatile static RAM organized as 2048 × 8 bits, featuring integrated lithium battery backup, automatic write protection during power loss, and JEDEC-standard 24-pin DIP packaging. It delivers 100 ns read/write access time, ±10% VCC tolerance (4.5 V to 5.5 V), and guaranteed 10-year data retention without external power - deployed in industrial control memory buffers and legacy system SRAM upgrades.
For engineers reviewing the DS1220AD-200 datasheet, DS1220AD-200 pinout, DS1220AD-200 application, or DS1220AD-200 equivalent, key selection criteria include its self-contained power-fail detection circuitry, direct replacement capability for 2k × 8 volatile SRAMs and 2716/2816 EPROM/EEPROM, and compatibility with microprocessor bus timing under full ±10% VCC operation.
Technical Context
The DS1220AD-200 implements a fully static NV SRAM architecture with on-chip voltage monitoring that triggers automatic lithium source activation when VCC falls below 4.25 V (VTP), ensuring unconditional write protection and high-impedance outputs. Its control logic supports standard microprocessor bus protocols via independent CE, WE, and OE inputs with tACC = 100 ns and tWC = 100 ns.
Unlike conventional SRAMs, the DS1220AD-200 integrates a freshness-sealed lithium cell electrically disconnected until first power-up, eliminating shelf-life degradation. The device maintains data integrity across power cycles without external capacitors, regulators, or firmware intervention - critical for fail-safe logging and configuration storage in unattended systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2048 words × 8 bits - matches byte-wide 2k × 8 SRAM footprint for drop-in replacement |
| Access Time | 100 ns - enables direct interface with 10 MHz bus systems without wait states |
| VCC Operating Range | 4.5 V to 5.5 V (±10%) - supports wide-input industrial power rails without regulation |
| Data Retention | 10 years without power - sustained by internal lithium source with no external components |
| Write Protection Threshold | VTP = 4.25 V to 4.5 V - initiates automatic backup switch at defined brown-out level |
| Package | 24-pin 720-mil extended DIP - JEDEC-compliant, compatible with 2716 EPROM and 2816 EEPROM footprints |
| Operating Temperature | 0°C to +70°C (Commercial) - validated for stable operation in ambient-controlled embedded environments |
Pinout & Package
DS1220AD-200 uses a 24-pin 720-mil extended dual in-line package (EDIP) with through-hole mounting and wave/hand-soldering compatibility. Pin numbering follows standard JEDEC DIP layout with pin 1 in top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address Inputs | 11-bit address bus supporting full 2048-word addressing; TTL-compatible input thresholds |
| DQ0–DQ7 | Data I/O | Bidirectional 8-bit data bus with 2 mA sink / 1 mA source drive strength |
| CE | Chip Enable | Active-low chip select; controls device enable and write-cycle initiation timing |
| WE | Write Enable | Active-low write strobe; determines write start/stop edges with CE per AC timing specs |
| OE | Output Enable | Active-low output control; disables drivers during writes to prevent bus contention |
| VCC | Power Supply | +5 V supply with ±10% tolerance; powers logic and enables lithium disconnect circuitry |
| GND | Ground | Reference return path for all signals and internal backup switching circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-Fail Detection | Monitors VCC continuously and switches to lithium backup within 1.5 µs when falling below 4.25 V |
| Freshness-Sealed Lithium Source | Lithium cell remains electrically isolated until first VCC application > VTP, preserving full 10-year capacity |
| Unlimited Write Cycles | No endurance limit on write operations - eliminates wear-leveling firmware overhead |
| Direct 2716/2816 Pin Compatibility | Identical pinout to 2716 EPROM and 2816 EEPROM - enables hardware-level ROM-to-NVRAM upgrade |
| Full ±10% VCC Operation | Functional across 4.5–5.5 V without derating - reduces need for precision voltage regulation |
Applications
| Industrial PLC Data Logging | Legacy Computer BIOS Storage |
|---|---|
Use Scenario: Storing runtime configuration and alarm history in programmable logic controllers operating in factory-floor environments with unstable mains power. IC Role / Device Role / Timing Role: Nonvolatile memory buffer retaining critical state data during unexpected AC loss or brownouts. Use Value: Eliminates need for external battery holders, backup capacitors, or supervisory ICs - reducing BOM count and board space. | Use Scenario: Replacing obsolete 2716 EPROMs in vintage PC motherboards requiring field-updatable boot parameters without reprogramming hardware. IC Role / Device Role / Timing Role: Byte-wide NVRAM acting as drop-in ROM replacement with read/write capability and identical timing. Use Value: Enables real-time BIOS parameter updates while maintaining full compatibility with existing 24-pin DIP sockets and address decoding logic. |
| Medical Device Configuration Memory | Avionics Maintenance Log Buffer |
Use Scenario: Holding calibration coefficients and user preferences in portable diagnostic equipment subject to frequent power cycling and transport-induced voltage drops. IC Role / Device Role / Timing Role: Self-protected SRAM ensuring zero data corruption during battery swaps or adapter disconnection. Use Value: Guarantees 10-year data retention without periodic refresh or external supervision - meeting IEC 62304 software lifecycle requirements. | Use Scenario: Capturing flight-hour counters and fault codes in aircraft maintenance recorders where power interruption during ground servicing must not erase logs. IC Role / Device Role / Timing Role: Fail-safe memory node activated only during VCC decay, isolating RAM from bus noise during transition. Use Value: Prevents partial writes and bit flips during power-down sequences - satisfying DO-160 Section 22 transient immunity compliance. |
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 VCC range (4.75–5.25 V); higher write-protection threshold (4.5 V) | Better suited for tightly regulated 5 V systems; less tolerant of brown-out conditions | Select DS1220AB-100+ when power supply ripple is < ±2.5% and brown-out risk is low |
| STK12C68-AW50 | Same 16k × 8 organization but 50 ns access time; requires external capacitor for backup | Higher speed but adds external component dependency and reduces reliability margin | Choose STK12C68-AW50 only if sub-100 ns timing is mandatory and capacitor sourcing is controlled |
Compared with DS1220AB-100+ and STK12C68-AW50, the DS1220AD-200 provides broader supply tolerance and integrated battery management - simplifying design validation for industrial systems with variable input voltage and eliminating capacitor aging concerns in long-lifecycle deployments.
Availability
DS1220AD-200 is available at Aetrix Electronics and suitable for industrial PLC data logging, legacy computer BIOS storage, and medical device configuration memory requiring stable component supply, long-term obsolescence mitigation, and RoHS-compliant through-hole packaging.
Supply support for DS1220AD-200 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) designs precision analog, mixed-signal, and nonvolatile memory solutions for industrial, automotive, and computing applications.
The DS1220AD-200 belongs to Maxim's legacy nonvolatile SRAM product line, engineered specifically for seamless replacement of aging EPROM, EEPROM, and volatile SRAM in mission-critical systems where data integrity during power failure is non-negotiable.
FAQ
What is the guaranteed data retention period for DS1220AD-200 when powered off?
The DS1220AD-200 guarantees 10 years of data retention in the absence of external power, based on its integrated lithium energy source and internal power-switching circuitry. This retention period begins after first application of VCC and assumes proper handling per the freshness seal specification. The DS1220AD-200 does not require periodic refresh or external backup components to maintain this rating.
Does DS1220AD-200 require external components for battery backup operation?
No, the DS1220AD-200 requires no external components for battery backup operation. Its self-contained lithium cell is electrically disconnected until first power-up, and internal monitoring circuitry automatically engages the backup source when VCC falls below 4.25 V. The DS1220AD-200 integrates all necessary switching, protection, and control logic on-die.
Can DS1220AD-200 directly replace a 2716 EPROM in an existing design?
Yes, the DS1220AD-200 has identical pinout, voltage levels, and timing characteristics to the 2716 EPROM, enabling direct socket replacement without PCB modification. Its read cycle behavior matches EPROM timing, and write cycles are disabled by default - making the DS1220AD-200 functionally transparent as ROM until actively written.
What is the minimum VCC level at which DS1220AD-200 initiates write protection?
The DS1220AD-200 initiates automatic write protection when VCC falls to 4.25 V (VTP min), as specified in its DC electrical characteristics. At this threshold, the device disables all inputs, places outputs in high-impedance state, and connects the internal lithium source to preserve RAM contents - a hardwired behavior independent of software or external control.
Is DS1220AD-200 compatible with industrial temperature requirements?
The base DS1220AD-200 variant operates from 0°C to +70°C (Commercial grade). For industrial temperature range (-40°C to +85°C), the correct ordering part is DS1220AD-100IND+, which shares identical electrical specifications and pinout but is screened and qualified for extended thermal operation. DS1220AD-200 itself is not rated for industrial temperatures.
DS1220AD-200 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-EDIP
DS1220AD-200 FAQ
1.How can I place an order for DS1220AD-200 through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1220AD-200 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-200 reliable?
The price and inventory of DS1220AD-200 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1220AD-200 is usually 5 days.
3.What payment methods are accepted for DS1220AD-200?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1220AD-200 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1220AD-200?
DS1220AD-200 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1220AD-200 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-200?
For technical support, including DS1220AD-200 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1220AD-200 requirements.
6.How does Aetrix verify that DS1220AD-200 is sourced from the original manufacturer or authorized distributors?
All DS1220AD-200 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-200 meets industry standards.
7.What is the process for return or replacement of DS1220AD-200?
All DS1220AD-200 units undergo pre-shipment inspection (PSI). If there is an issue with DS1220AD-200, 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-200 part is unused and in its original packaging.
Return procedure for DS1220AD-200:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS1220AD-200 Tags
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