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Analog Devices Inc./Maxim Integrated DS1220AD-100
- Part No.:
- DS1220AD-100
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- 24-DIP Module (0.600", 15.24mm)
- Datasheet:
-
DS1220AD-100.pdf
- Description:
- IC NVSRAM 16KBIT PARALLEL 24EDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,449
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Product details
Overview
DS1220AD-100 from Maxim Integrated (formerly Dallas Semiconductor) is a 16k nonvolatile static RAM organized as 2048 × 8 bits, featuring integrated lithium battery backup, 100 ns read/write access time, ±10% VCC tolerance (4.5V–5.5V), and industrial temperature rating (–40°C to +85°C). It directly replaces volatile 2k × 8 SRAMs in legacy memory subsystems requiring autonomous data retention during power loss.
For engineers reviewing the DS1220AD-100 datasheet, DS1220AD-100 pinout, DS1220AD-100 application, or DS1220AD-100 equivalent, key selection criteria include its self-contained lithium power switching, guaranteed 10-year data retention without external circuitry, JEDEC-standard 24-pin EDIP package compatibility with 2716 EPROM/2816 EEPROM footprints, and write-protection activation at 4.25V.
Technical Context
The DS1220AD-100 implements a fully static NV SRAM architecture with on-chip voltage monitoring and automatic lithium source switchover below ~3.0V. Its control logic enforces unconditional write protection when VCC falls below 4.25V, placing all inputs in "don't care" state and outputs in high-impedance mode.
It supports standard parallel bus timing: tACC = 100 ns, tRC = 100 ns, tWC = 100 ns, with CE/OE/WE active-low control and full compatibility with microprocessor address/data bus protocols-no wait states or support ICs required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2048 words × 8 bits (16,384-bit nonvolatile SRAM) |
| Access Time | 100 ns - enables direct interface with 10 MHz bus systems without wait states |
| VCC Range | 4.5V to 5.5V (±10%) - supports wide-input industrial power rails |
| Data Retention | 10 years minimum without external power - guaranteed by internal lithium cell and power-fail detection circuitry |
| Write Protection Threshold | 4.25V - triggers automatic write lock and lithium switchover before data corruption occurs |
| Operating Temperature | –40°C to +85°C (IND grade) - qualified for harsh industrial environments |
| Package | 24-pin 720-mil Extended DIP (EDIP) - JEDEC-standard footprint compatible with 2716/2816 sockets |
Pinout & Package
DS1220AD-100 uses a 24-pin 720-mil Extended Dual In-line Package (EDIP) with through-hole mounting and RoHS-compliant lead finish ("+" suffix). The package includes internal lithium cell, voltage monitor, and power-switching 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 when CE/OE inactive or during write |
| CE | Chip Enable | Active-low chip select; must be low with WE low for write, or with OE low for read |
| WE | Write Enable | Active-low write strobe; controls data latching and disables outputs during write |
| OE | Output Enable | Active-low output enable; kept high during writes to prevent bus contention |
| VCC | Power Supply | +5V supply (4.5–5.5V); powers logic and enables lithium disconnect until first power-up |
| GND | Ground | Reference return path for all signals and internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Integrated lithium power source | Electrically disconnected until first VCC application, preserving full 10-year capacity |
| Automatic power-fail response | Switches to lithium backup and locks writes within 1.5 µs of VCC drop below 4.25V |
| Unlimited write cycles | No endurance limit-supports continuous logging or real-time configuration updates |
| Direct EPROM/EEPROM replacement | Pins match 2716 EPROM and 2816 EEPROM, enabling drop-in upgrade without PCB change |
| Low-power CMOS design | Standby current ≤10 mA (ICCS1), operating current ≤85 mA (industrial grade) |
Applications
| Industrial PLC Data Logging | Military Avionics Configuration Storage |
|---|---|
Use Scenario: Storing runtime parameters, calibration tables, and fault logs in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile memory buffer retaining critical state data across uncontrolled power interruptions. Use Value: Eliminates need for external battery holders, backup capacitors, or EEPROM wear-leveling firmware-ensures deterministic 10-year retention at –40°C to +85°C. | Use Scenario: Holding flight-critical configuration settings and sensor calibration coefficients in airborne mission computers. IC Role / Device Role / Timing Role: Fail-safe memory element that autonomously preserves data during brownouts or emergency shutdowns. Use Value: Guarantees sub-microsecond write-protection activation and zero-cycle latency reads-meets DO-254 functional safety timing constraints. |
| Medical Diagnostic Equipment Memory | Telecom Base Station Real-Time Clock Backup |
Use Scenario: Caching patient history, device calibration, and diagnostic session data in portable ultrasound and ECG units. IC Role / Device Role / Timing Role: High-reliability SRAM replacement ensuring data integrity during battery swaps or AC mains failure. Use Value: Delivers 100 ns random-access performance while eliminating EEPROM write delays and flash erase cycles. | Use Scenario: Backing up RTC registers and network synchronization timestamps in cellular infrastructure equipment. IC Role / Device Role / Timing Role: Low-leakage memory holding time-of-day and sync state during extended AC outages. Use Value: Maintains timestamp accuracy for >10 years without external power-no periodic refresh or checksum validation required. |
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 (4.75–5.25V); higher write-protection threshold (4.5V) | Better suited for stable 5V ±5% supplies; less tolerant of brownout conditions | Select DS1220AB-100IND+ only if system VCC regulation exceeds ±5% and brownout risk is minimal |
| MAX6900A–100 | Serial I²C interface; 1k × 8 organization; no integrated battery; requires external backup power | Lower pin count, smaller footprint, but adds protocol overhead and external components | Choose MAX6900A–100 for space-constrained designs where serial interface and lower density are acceptable trade-offs |
Compared with DS1220AB-100IND+, the DS1220AD-100 offers wider supply tolerance and earlier write-lock activation-critical for field-deployed equipment with variable input rails. Against MAX6900A–100, DS1220AD-100 delivers parallel-bus speed, autonomous backup, and plug-compatible replacement-eliminating firmware changes and external power management.
Availability
DS1220AD-100 is available at Aetrix Electronics and suitable for industrial PLCs, avionics subsystems, and medical diagnostics equipment requiring stable component supply, long-lifecycle assurance, and guaranteed 10-year data retention under uncontrolled power conditions.
Supply support for DS1220AD-100 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 U.S.-based semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The DS1220AD-100 belongs to Maxim's legacy nonvolatile memory product line, designed specifically for seamless, pin-compatible upgrades of aging 2k × 8 SRAM, EPROM, and EEPROM systems in mission-critical industrial and military platforms.
FAQ
What is the guaranteed data retention period for DS1220AD-100?
The DS1220AD-100 guarantees a minimum 10-year data retention period in the absence of external power, measured from the time VCC is first applied. This specification is ensured by the internal lithium energy source and power-fail detection circuitry, and is validated per design-not subject to 100% testing but backed by Maxim's reliability qualification standards.
Does DS1220AD-100 require external backup components?
No, DS1220AD-100 does not require external backup components. It integrates a lithium energy source, voltage monitor, and automatic power-switching circuitry within the 24-pin EDIP package. Once VCC is applied for the first time, the lithium cell is electrically connected and remains ready to sustain memory during power loss-no capacitors, batteries, or support ICs are needed.
Is DS1220AD-100 pin-compatible with standard 2716 EPROMs?
Yes, DS1220AD-100 is pin-compatible with the 2716 EPROM and 2816 EEPROM. Its 24-pin EDIP footprint, address/data pin mapping (A0–A10, DQ0–DQ7), and control signal assignments (CE, OE, WE) match JEDEC-standard layouts-enabling direct socket replacement without PCB modification or firmware changes.
What is the write-protection voltage threshold for DS1220AD-100?
The DS1220AD-100 activates unconditional write protection when VCC falls to 4.25V (minimum), with typical activation at 4.37V. At this threshold, all inputs become "don't care," outputs go high-impedance, and the lithium source automatically connects to preserve stored data-preventing corruption during brownout conditions.
Can DS1220AD-100 operate across the full industrial temperature range?
Yes, DS1220AD-100IND+ is rated for continuous operation from –40°C to +85°C. All DC and AC electrical specifications-including 100 ns access time, standby current, and write-protection behavior-are guaranteed across this full industrial temperature range, making it suitable for deployment in outdoor, vehicular, and factory-floor environments.
DS1220AD-100 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-EDIP
DS1220AD-100 FAQ
1.How can I place an order for DS1220AD-100 through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1220AD-100 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-100 reliable?
The price and inventory of DS1220AD-100 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1220AD-100 is usually 5 days.
3.What payment methods are accepted for DS1220AD-100?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1220AD-100 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1220AD-100?
DS1220AD-100 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1220AD-100 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-100?
For technical support, including DS1220AD-100 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1220AD-100 requirements.
6.How does Aetrix verify that DS1220AD-100 is sourced from the original manufacturer or authorized distributors?
All DS1220AD-100 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-100 meets industry standards.
7.What is the process for return or replacement of DS1220AD-100?
All DS1220AD-100 units undergo pre-shipment inspection (PSI). If there is an issue with DS1220AD-100, 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-100 part is unused and in its original packaging.
Return procedure for DS1220AD-100:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS1220AD-100 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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AT24C04C-SSHM-T
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