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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:1,302
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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 JEDEC-standard 24-pin extended DIP packaging. It delivers 100 ns read/write access time, ±10% VCC tolerance (4.5 V to 5.5 V), and guarantees ≥10 years data retention without external power - deployed in industrial control memory buffers and legacy system NVRAM upgrades.
For engineers reviewing the DS1220AD-120 datasheet, DS1220AD-120 pinout, DS1220AD-120 application, or DS1220AD-120 equivalent, key selection criteria include its self-contained power-fail detection circuitry, direct replacement capability for 2k × 8 SRAM/EPROM/EEPROM, guaranteed 10-year data retention, and compatibility with microprocessor bus timing under ±10% VCC operation.
Technical Context
The DS1220AD-120 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 enforces strict timing: tACC = 100 ns, tWC = 100 ns, and tPD = 1.5 µs for power-down detection.
It operates across 0°C to +70°C (commercial grade), supports unlimited write cycles with no wear leveling required, and maintains full functionality over VCC = 4.5 V–5.5 V while consuming ≤85 mA active current and ≤10 mA standby current - eliminating need for external backup controllers or capacitors.
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 Operating Range | 4.5 V to 5.5 V (±10%) - tolerates wide supply variation in legacy industrial power rails |
| Data Retention | ≥10 years without power - enabled by sealed lithium cell and automatic VCC-monitored switchover |
| Write Protection Threshold | VTP = 4.25 V to 4.5 V - triggers immediate write lockout before data corruption occurs |
| Package | 24-pin 720-mil extended DIP - matches pinout of 2716 EPROM and 2816 EEPROM for drop-in replacement |
| Operating Temperature | 0°C to +70°C - commercial-grade thermal rating suitable for controlled-environment embedded systems |
Pinout & Package
DS1220AD-120 uses a JEDEC-standard 24-pin extended DIP (720-mil width) package with through-hole mounting and wave/hand-soldering compatibility. The encapsulated module integrates lithium battery, voltage monitor, and power-switching circuitry within the same package body.
| 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 2.0 mA sink / -1.0 mA source drive strength |
| 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 tristate drivers only during reads (tOE = 50 ns) |
| VCC | Power Supply | +5 V nominal supply with ±10% tolerance; powers RAM core and monitoring circuitry |
| GND | Ground Reference | Signal and power ground reference; must be low-impedance for reliable power-fail detection |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-Fail Response | Sub-2 µs detection (tPD = 1.5 µs) and lithium switchover at VCC ≈ 3.0 V prevents data loss during brownouts |
| Freshness Seal | Lithium source electrically disconnected until first VCC application > VTP, preserving full 10-year capacity |
| Unlimited Write Endurance | No wear-out mechanism - eliminates need for write-cycle counting or firmware wear leveling |
| Direct EPROM/EEPROM Replacement | Identical 24-pin DIP footprint and pinout to 2716 and 2816 devices, enabling hardware-level drop-in upgrade |
| Self-Contained Backup | No external capacitors, batteries, or support ICs required - reduces BOM count and board space |
Applications
| Industrial PLC Data Logging | Medical Device Configuration Storage |
|---|---|
Use Scenario: Retaining runtime parameters and calibration settings across unexpected AC mains failure in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile memory buffer interfacing directly to 8-bit microcontroller data/address buses with no glue logic. Use Value: Guarantees 10-year data integrity without external battery management, meeting IEC 61131-2 reliability requirements. | Use Scenario: Storing patient-specific therapy profiles and device configuration in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Pin-compatible NVRAM replacement for aging 2816 EEPROMs, enabling faster write cycles and elimination of erase delays. Use Value: Supports unlimited reconfiguration during clinical use without endurance degradation or timeout penalties. |
| Avionics Black Box Memory | Legacy Telecom Switch Firmware Cache |
Use Scenario: Capturing flight-critical sensor snapshots and fault logs in aircraft data acquisition units where power interruption is frequent. IC Role / Device Role / Timing Role: Self-powered SRAM acting as crash-data buffer with deterministic write-protection activation at 4.25 V threshold. Use Value: Meets DO-160 Section 21 Category A power-interruption immunity without auxiliary hold-up capacitors. | Use Scenario: Caching boot firmware and routing tables in telecom central office switches requiring hot-swap capability and zero-downtime updates. IC Role / Device Role / Timing Role: High-speed (100 ns) NVRAM replacing volatile SRAM + battery combo, simplifying thermal design and service logistics. Use Value: Enables field firmware updates with guaranteed rollback integrity after power restoration. |
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 (4.5–4.75 V); same 100 ns speed and 24-pin DIP | Better suited for stable 5 V ±5% supplies; less tolerant of brownout conditions than DS1220AD-120 | Select DS1220AB-100+ only if system VCC regulation meets tighter tolerance and higher VTP improves noise margin |
| STK12C68-AV10 | Same 16k × 8 organization and 100 ns access; requires external capacitor for backup; different pinout (28-pin SOJ) | Not pin-compatible; demands PCB redesign; lacks integrated lithium and automatic switchover logic | Choose STK12C68-AV10 only if cost sensitivity outweighs design effort and long-term reliability requirements |
Compared with DS1220AB-100+, DS1220AD-120 offers wider supply tolerance and earlier write protection - critical for unregulated industrial rails. Against STK12C68-AV10, DS1220AD-120 provides true plug-and-play integration with no external components or layout changes.
Availability
DS1220AD-120 is available at Aetrix Electronics and suitable for industrial PLC data logging, medical device configuration storage, and avionics black box memory requiring stable component supply, long-lifecycle support, and guaranteed 10-year data retention.
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 power-management ICs for industrial, automotive, and communications applications.
The DS1220AD-120 belongs to Maxim's nonvolatile SRAM product line, engineered specifically to replace volatile memory and early-generation EEPROMs in systems demanding zero-write-endurance limits, deterministic power-loss response, and minimal board-level support circuitry.
FAQ
What is the guaranteed data retention period for DS1220AD-120?
The DS1220AD-120 guarantees ≥10 years of data retention in the absence of external power, measured from the time VCC is first applied and the internal lithium energy source is activated. This specification is design-guaranteed and applies across the full commercial temperature range (0°C to +70°C), with no derating required for typical operating conditions.
Does DS1220AD-120 require external backup components?
No, DS1220AD-120 does not require external backup components. It integrates a sealed lithium energy source, voltage-monitoring circuitry, and automatic power-switching logic within the 24-pin DIP package. Once VCC is applied for the first time, the lithium cell is electrically connected - no capacitors, batteries, or support ICs are needed for nonvolatile operation.
Is DS1220AD-120 pin-compatible with standard EPROMs or EEPROMs?
Yes, DS1220AD-120 is pin-compatible with the 2716 EPROM and 2816 EEPROM, sharing identical 24-pin DIP pinout and signal assignments (A0–A10, DQ0–DQ7, CE, OE, WE, VCC, GND). This allows direct hardware substitution without PCB modification, while delivering faster access times and unlimited write cycles compared to those legacy devices.
What is the write protection voltage threshold for DS1220AD-120?
The DS1220AD-120 activates unconditional write protection when VCC falls below its write protection threshold (VTP) of 4.25 V to 4.5 V. At this point, all inputs become "don't care," outputs go high-impedance, and the lithium source automatically powers the RAM - preventing corruption during brownout or power-fail events.
Can DS1220AD-120 operate across the full industrial temperature range?
No, DS1220AD-120 is specified for the commercial temperature range (0°C to +70°C). For industrial operation (-40°C to +85°C), the variant DS1220AD-100IND+ must be used - it shares identical electrical specifications and pinout but is screened and qualified for extended temperature performance.
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:
- 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:
- 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.
DS1220AD-120 Tags
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