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Analog Devices Inc./Maxim Integrated DS1220AD-120+
- Part No.:
- DS1220AD-120+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- 24-DIP Module (0.600", 15.24mm)
- Datasheet:
-
DS1220AD-120+.pdf
- Description:
- IC NVSRAM 16KBIT PARALLEL 24EDIP
- Quantity:
- Payment:
- Shipping:
Inventory:103
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Product details
Overview
DS1220AD-120+ from Maxim Integrated (now Analog Devices) is a 16k nonvolatile static RAM organized as 2048 × 8 bits, featuring integrated lithium battery backup, 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 and data logging systems requiring persistent memory without external support circuitry.
For engineers reviewing the DS1220AD-120+ datasheet, DS1220AD-120+ pinout, DS1220AD-120+ application, or DS1220AD-120+ equivalent, key selection factors include its ±10% VCC tolerance (4.5V–5.5V), 10-year data retention, JEDEC-standard 24-pin extended DIP package, and seamless drop-in compatibility with 2716 EPROM and 2816 EEPROM footprints.
Technical Context
The DS1220AD-120+ 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 ensures low standby current (≤10 mA) and unlimited write cycles without wear leveling.
Unlike conventional NVSRAMs requiring external capacitors or controllers, the DS1220AD-120+ integrates the energy source and switching logic into a single 720-mil 24-pin EDIP package. Its timing conforms to standard SRAM protocols-tACC = 100 ns, tWC = 100 ns-with full compatibility for CE/OE/WE control signals and address/data bus interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2048 words × 8 bits (16,384-bit nonvolatile SRAM) |
| VCC Operating Range | 4.5 V to 5.5 V (±10% tolerance; enables robust operation across noisy industrial rails) |
| Access Time | 100 ns (matches legacy 2k × 8 SRAM timing for direct replacement without system redesign) |
| Data Retention | 10 years minimum without external power (guaranteed by design, enabled by sealed lithium cell) |
| Write Protection Threshold | VTP = 4.25 V (triggers automatic backup switch and input disable before data corruption occurs) |
| Operating Temperature | 0°C to +70°C (commercial grade; IND variant supports –40°C to +85°C) |
| Package | 24-pin extended DIP (720-mil; JEDEC-compliant, wave-solderable, RoHS-compliant "+" suffix) |
Pinout & Package
DS1220AD-120+ uses a 24-pin extended dual in-line package (EDIP), 720 mil width, with through-hole mounting and RoHS-compliant lead finish ("+" suffix). The package integrates a hermetically sealed lithium energy source and on-chip power-switching circuitry.
| 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 power-down |
| CE | Chip Enable | Active-low chip select; initiates read/write when low and synchronized with WE/OE |
| WE | Write Enable | Active-low write strobe; controls data latching and output disable during writes |
| OE | Output Enable | Active-low output enable; isolates data bus when high to prevent contention |
| VCC | Power Supply | +5 V supply (4.5–5.5 V range); 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 backup | Lithium cell electrically disconnected until first VCC application, preserving full 10-year capacity |
| Automatic power-fail response | Switches to battery backup within 1.5 µs when VCC falls below 4.25 V; no firmware or external supervision required |
| Unlimited write endurance | No wear-out mechanism-supports infinite write cycles unlike EEPROM or Flash |
| Direct EPROM/EEPROM replacement | Pins match 2716 EPROM and 2816 EEPROM, enabling hardware-level drop-in upgrade without PCB change |
| Full ±10% VCC tolerance | Operates reliably across wide supply variation-ideal for unregulated or aging power supplies |
Applications
| Industrial Data Logger | Medical Device Memory Backup |
|---|---|
Use Scenario: Continuous acquisition of sensor readings in remote environmental monitoring stations with intermittent AC power. IC Role / Device Role / Timing Role: Nonvolatile SRAM storing real-time operational logs and calibration data during mains failure. Use Value: Guarantees 10-year data integrity without supercapacitors or external battery management, reducing BOM count and field maintenance. | Use Scenario: Storing patient therapy parameters and fault history in portable infusion pumps subject to frequent battery swaps. IC Role / Device Role / Timing Role: Primary configuration memory retaining critical settings across power cycles and battery removal. Use Value: Eliminates risk of parameter loss during hot-swap events-no software-initiated save routines or checksum validation needed. |
| PLC Configuration Storage | Avionics Power-Up State Retention |
Use Scenario: Preserving ladder logic runtime variables and I/O mapping in programmable logic controllers during brownouts. IC Role / Device Role / Timing Role: Volatile SRAM replacement with embedded backup, maintaining state during <100 ms dips. Use Value: Enables deterministic restart after transient faults-no reinitialization delay or watchdog reset required. | Use Scenario: Holding flight control initialization vectors and sensor bias offsets in airborne navigation units during engine start-up sequencing. IC Role / Device Role / Timing Role: High-reliability memory buffer ensuring deterministic boot behavior under variable aircraft bus voltage. Use Value: Meets DO-160 Section 16 surge/brownout requirements via sub-3 µs fail-detect response and zero-latency backup activation. |
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 tolerance (±5%; VTP = 4.5 V); otherwise identical pinout, timing, and retention | Suitable where regulated 5 V ±5% supply is guaranteed; less tolerant of rail sag during brownouts | Select DS1220AB-100+ only if system power stability exceeds ±5% and write-protection margin above 4.5 V is acceptable |
| STK12C68-AW50I | Same 16k × 8 organization but uses external capacitor for backup; 50 ns access time; SOIC-28 package | Requires external 0.47 F capacitor and charge circuit; not pin-compatible; higher board area cost | Choose STK12C68-AW50I only when surface-mount assembly is mandatory and capacitor-based backup is already designed in |
Compared with DS1220AB-100+, the DS1220AD-120+ offers wider supply tolerance and earlier write protection-critical for unregulated environments-while STK12C68-AW50I trades integration for package flexibility but adds design complexity and component count.
Availability
DS1220AD-120+ is available at Aetrix Electronics and suitable for industrial data loggers, medical device configuration storage, and PLC runtime memory applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant through-hole packaging.
Supply support for DS1220AD-120+ 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, medical, and automotive applications.
The DS1220AD-120+ belongs to Maxim's legacy NVSRAM product line, engineered specifically to eliminate external backup components while delivering plug-compatible reliability for mission-critical memory retention.
FAQ
What is the guaranteed data retention period for DS1220AD-120+?
The DS1220AD-120+ guarantees a minimum 10-year data retention period in the absence of external power, based on design qualification and lithium cell capacity modeling. This retention starts from the moment VCC is first applied-the internal freshness seal ensures full energy reserve until initial power-up. No periodic refresh or external power is required during this period.
Does DS1220AD-120+ require external components for battery backup operation?
No, the DS1220AD-120+ requires no external components for battery backup operation. It integrates a sealed lithium energy source and fully autonomous power-switching circuitry. The lithium cell remains electrically disconnected until first application of VCC, eliminating leakage and preserving shelf life. All control logic-including VCC monitoring, write protection, and output isolation-is implemented on-die.
Is DS1220AD-120+ pin-compatible with standard 2716 EPROMs?
Yes, DS1220AD-120+ is pin-compatible with the 2716 EPROM. Its 24-pin extended DIP footprint, signal assignments (A0–A10, DQ0–DQ7, CE, OE, VCC, GND), and timing parameters (tACC = 100 ns) match the 2716 specification. This allows direct hardware substitution without PCB modification-enabling immediate performance and reliability upgrades in legacy designs.
What is the write protection voltage threshold for DS1220AD-120+?
The write protection voltage threshold for DS1220AD-120+ is VTP = 4.25 V (minimum), with typical value 4.37 V and maximum 4.5 V. When VCC decays below this threshold, the device automatically disables all inputs, places outputs in high-impedance state, and connects the internal lithium source to preserve RAM contents-preventing corruption during brownout conditions.
Can DS1220AD-120+ operate across the full industrial temperature range?
The DS1220AD-120+ is specified for commercial temperature range (0°C to +70°C). For industrial operation (–40°C to +85°C), the correct variant is DS1220AD-120IND+. Both share identical electrical specifications and pinout, but only the IND-suffixed version is qualified and tested across the extended temperature range per the datasheet's Recommended Operating Conditions table.
DS1220AD-120+ 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:
- 120ns
- Access Time:
- 120 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-120+ FAQ
1.How can I place an order for DS1220AD-120+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1220AD-120+ 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-120+ reliable?
The price and inventory of DS1220AD-120+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1220AD-120+ is usually 5 days.
3.What payment methods are accepted for DS1220AD-120+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1220AD-120+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1220AD-120+?
DS1220AD-120+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1220AD-120+ 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-120+?
For technical support, including DS1220AD-120+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1220AD-120+ requirements.
6.How does Aetrix verify that DS1220AD-120+ is sourced from the original manufacturer or authorized distributors?
All DS1220AD-120+ 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-120+ meets industry standards.
7.What is the process for return or replacement of DS1220AD-120+?
All DS1220AD-120+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1220AD-120+, 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-120+ part is unused and in its original packaging.
Return procedure for DS1220AD-120+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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