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Analog Devices Inc./Maxim Integrated DS1220Y-120+
- Part No.:
- DS1220Y-120+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- 24-DIP Module (0.600", 15.24mm)
- Datasheet:
-
DS1220Y-120+.pdf
- Description:
- IC NVSRAM 16KBIT PARALLEL 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,847
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Product details
Overview
DS1220Y-120+ from Maxim Integrated is a 16k (2048 × 8) nonvolatile static RAM with integrated lithium backup, JEDEC-standard 24-pin DIP package, 120 ns read/write access time, ±10% VCC tolerance (4.5–5.5 V), and guaranteed 10-year data retention without external power. It replaces volatile 2k×8 SRAMs and EEPROMs in real-time clock, metering, and configuration storage applications.
For engineers reviewing the DS1220Y-120+ datasheet, DS1220Y-120+ pinout, DS1220Y-120+ application, or DS1220Y-120+ equivalent, key selection considerations include its automatic power-loss write protection, unlimited write cycles, direct 24-pin DIP compatibility with 2716 EPROM/2816 EEPROM footprints, and industrial-grade temperature option (IND variant).
Technical Context
The DS1220Y-120+ integrates a self-contained lithium battery and voltage-monitoring circuitry that triggers unconditional write protection when VCC drops below 4.25 V, then switches to battery power below ~3.0 V to retain data. Its control logic supports standard microprocessor bus interfacing with independent CE, WE, and OE signals.
It operates as a fully static RAM with no refresh required, supports asynchronous read/write cycles with tACC = 120 ns and tWC = 120 ns, and maintains high-impedance outputs during power transition, eliminating bus contention during brownout or power-up sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 16,384 bits (2048 words × 8 bits); matches 2k×8 SRAM/EEPROM footprint for drop-in replacement. |
| Access Time | 120 ns max tACC and tWC; enables use with 8 MHz Z80, 6502, or 8085-based systems without wait states. |
| VCC Range | 4.5 V to 5.5 V (±10%); supports legacy 5 V rails with margin for ripple and aging. |
| Data Retention | 10 years minimum without external power; enabled by internal Li battery and automatic switchover at ~3.0 V. |
| Write Protection Threshold | 4.25 V nominal VTP; ensures data integrity before VCC decay causes logic failure. |
| Operating Temp | 0°C to +70°C (commercial grade); IND variant extends to –40°C to +85°C for industrial environments. |
| Package | 24-pin 720-mil extended DIP; JEDEC-standard footprint compatible with 2716 EPROM and 2816 EEPROM sockets. |
Pinout & Package
DS1220Y-120+ uses a 24-pin 720-mil extended dual in-line package (DIP), compliant with JEDEC MS-001. The package includes internal lithium cell and power-switching circuitry; no external backup components are required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address Inputs | 11-bit address bus for 2048-word addressing; TTL-compatible inputs with VIH ≥ 2.2 V. |
| DQ0–DQ7 | Bidirectional Data I/O | 8-bit data bus; high-impedance when OE or CE inactive; supports shared microprocessor data bus. |
| CE | Chip Enable | Active-low chip select; initiates read/write when low; controls power-down detection timing (tPD = 0 μs). |
| WE | Write Enable | Active-low write strobe; determines write start/stop edges with CE; disables outputs in tODW = 35 ns. |
| 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; triggers automatic backup switchover below ~3.0 V. |
| GND | Ground Reference | Signal and power ground; all voltage specs referenced to this node; requires low-impedance connection. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-Fail Protection | Monitors VCC in real time; unconditionally enables write protection and switches to lithium backup below 4.25 V, preventing corruption during brownout. |
| Unlimited Write Cycles | No endurance limit on write operations-enables frequent configuration updates without wear-out concerns typical of EEPROM or Flash. |
| Direct Pin-Compatible Replacement | Matches 2716 EPROM and 2816 EEPROM pinouts; allows retrofit into existing sockets without PCB modification. |
| Zero External Support Circuitry | Self-contained lithium cell, voltage monitor, and power switch eliminate need for external capacitors, regulators, or backup controllers. |
| Full Static Operation | No refresh required; retains data indefinitely while powered or backed up-ideal for low-power or intermittently powered systems. |
Applications
| Industrial Metering | Real-Time Clock (RTC) Backup |
|---|---|
|
Use Scenario: Electricity/water/gas meters storing billing data, tariff tables, and event logs across power outages. IC Role / Device Role / Timing Role: Nonvolatile configuration and usage history storage with guaranteed 10-year retention. Use Value: Eliminates need for supercapacitors or external battery management; survives grid instability and long-term blackouts. |
Use Scenario: Embedded RTC modules retaining time/date, alarm settings, and calibration constants during main power loss. IC Role / Device Role / Timing Role: Battery-backed RAM holding volatile RTC registers and user preferences. Use Value: Maintains accurate timekeeping without drift or reset; no firmware overhead for save/restore routines. |
| Legacy System Configuration Storage | Medical Device Parameter Retention |
|
Use Scenario: Industrial PLCs and CNC controllers preserving setup parameters, tool offsets, and calibration coefficients. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 2k×8 SRAMs in socketed designs using 24-pin DIP layout. Use Value: Enables life-extension of legacy equipment without redesign; supports same address/data bus timing as original SRAM. |
Use Scenario: Portable diagnostic devices (e.g., ECG monitors, infusion pumps) storing patient-specific therapy profiles and device settings. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory for critical operational parameters requiring regulatory compliance. Use Value: Meets IEC 62304 data retention requirements; lithium integration avoids external battery certification burden. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS1225Y-120+ | Same architecture and pinout; 64k (8k×8) capacity; higher standby current (ICCS1 = 10 mA vs. 7 mA). | Used where larger configuration space is needed; not suitable for strict 16k footprint constraints. | Select DS1225Y-120+ only if memory expansion is required and board layout accommodates identical 24-pin DIP. |
| STK12C68-AW50 | 50 ns access time; 8k×8 organization; different VTP (4.0 V); RoHS-compliant but lacks U.L. recognition. | Preferred for new designs needing faster timing or lower power; not validated for safety-critical backup roles. | Choose STK12C68-AW50 for cost-sensitive, non-certified applications; DS1220Y-120+ remains preferred for UL-recognized systems. |
Compared with DS1220Y-120+, DS1225Y-120+ offers greater density at the cost of higher quiescent draw, while STK12C68-AW50 trades retention assurance and safety certification for speed and RoHS compliance-making DS1220Y-120+ optimal for legacy-replacement and regulated environments.
Availability
DS1220Y-120+ is available at Aetrix Electronics and suitable for industrial metering, real-time clock backup, and legacy system configuration storage requiring stable component supply, long-life data retention, and JEDEC-standard DIP compatibility.
Supply support for DS1220Y-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 (now part of Analog Devices) is a semiconductor company specializing in analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The DS1220Y-120+ belongs to Maxim's nonvolatile SRAM product line, designed specifically for seamless replacement of volatile memory in legacy systems where data integrity during power loss is mission-critical.
FAQ
What is the guaranteed data retention period for DS1220Y-120+ without external power?
The DS1220Y-120+ guarantees a minimum of 10 years of data retention without external power, measured from the date code stamped on the device. This is achieved via an integrated lithium energy source and automatic power-fail switchover circuitry that activates when VCC falls below ~3.0 V. The DS1220Y-120+ does not require external batteries or capacitors to meet this specification.
Is DS1220Y-120+ pin-compatible with standard 2716 EPROMs?
Yes, DS1220Y-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 socket replacement in legacy designs without PCB changes. The DS1220Y-120+ retains full read/write functionality while adding nonvolatility and unlimited write cycles.
Does DS1220Y-120+ require external circuitry for battery backup operation?
No, DS1220Y-120+ requires no external circuitry for battery backup operation. It integrates a lithium energy source, voltage monitor, and power-switching circuitry within the 24-pin DIP package. The DS1220Y-120+ automatically detects VCC decay, enables write protection at 4.25 V, and switches to internal lithium power below ~3.0 V-fully autonomous operation.
What is the maximum operating temperature range for DS1220Y-120+?
The DS1220Y-120+ is rated for commercial temperature operation from 0°C to +70°C. An industrial-grade variant, DS1220Y-120IND+, is available for –40°C to +85°C operation. The DS1220Y-120+ itself is not specified for extended temperature ranges; using it outside 0°C–70°C may compromise data retention or reliability.
How does DS1220Y-120+ handle write cycles during power transitions?
DS1220Y-120+ disables write capability and places all outputs in high-impedance state when VCC falls below 4.25 V, preventing partial writes or bus contention. During power-up, it remains write-protected until VCC exceeds 4.5 V and stabilizes. The DS1220Y-120+ ensures no unintended writes occur during brownout or startup-critical for maintaining configuration integrity.
DS1220Y-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-DIP
DS1220Y-120+ FAQ
1.How can I place an order for DS1220Y-120+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1220Y-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 DS1220Y-120+ reliable?
The price and inventory of DS1220Y-120+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1220Y-120+ is usually 5 days.
3.What payment methods are accepted for DS1220Y-120+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1220Y-120+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1220Y-120+?
DS1220Y-120+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1220Y-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 DS1220Y-120+?
For technical support, including DS1220Y-120+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1220Y-120+ requirements.
6.How does Aetrix verify that DS1220Y-120+ is sourced from the original manufacturer or authorized distributors?
All DS1220Y-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 DS1220Y-120+ meets industry standards.
7.What is the process for return or replacement of DS1220Y-120+?
All DS1220Y-120+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1220Y-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 DS1220Y-120+ part is unused and in its original packaging.
Return procedure for DS1220Y-120+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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