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Analog Devices Inc./Maxim Integrated DS28EC20+
- Part No.:
- DS28EC20+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
DS28EC20+.pdf
- Description:
- IC EEPROM 20KBIT 1-WIRE TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,015
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Product details
Overview
DS28EC20+ from Analog Devices is a 20480-bit, single-conductor 1-Wire® EEPROM in TO-92 package, organized as 80 pages × 256 bits with one dedicated control page. It features factory-programmed 64-bit ROM for unique device identification, 256-bit scratchpad with verify-before-copy write protocol, and per-block (8-page) write protection or EPROM-emulation mode. Used in ink/toner cartridge authentication and IEEE 1451.4 TEDS calibration storage.
For engineers reviewing the DS28EC20+ datasheet, DS28EC20+ pinout, DS28EC20+ application, or DS28EC20+ equivalent, this page delivers verified electrical specs (4V–5.25V operation, -40°C to +85°C), true 1-Wire timing parameters (tRSTL = 480–640µs, tSLOT = 65µs), memory architecture details (80×32-byte pages, register page at 0A00h), and confirmed alternatives for device authentication and calibration data storage.
Technical Context
The DS28EC20+ implements a parasitic-power 1-Wire interface with strict timing compliance to standard-speed (15.4kbps) and overdrive-speed (90kbps) protocols. Its memory subsystem includes volatile 32-byte scratchpad, 20480-bit EEPROM array partitioned into ten 2048-bit blocks, and a dedicated register page (0A00h–0A3Fh) containing block protection controls, user EEPROM, and lock bytes.
Write operations require two-phase execution: first write to scratchpad with CRC-verified integrity, then copy to EEPROM with self-timed 10ms programming cycle. Block-level security is enforced via programmable protection bytes (55h = write-protect, AAh = EPROM mode), and copy protection is activated by locking memory block or register page registers - both irreversible once set to 55h or AAh.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 20480 bits (80 × 256-bit pages), plus 256-bit scratchpad and control register page |
| 1-Wire Interface | Parasitic-powered, single-conductor bus; supports standard (15.4kbps) and overdrive (90kbps) speeds |
| Operating Voltage | 4.0V–5.25V at -40°C to +85°C; 3.135V–3.465V at 0°C to +70°C |
| Endurance & Retention | 200k write/erase cycles at +25°C; 40-year data retention at +85°C |
| Unique ID | Factory-programmed, unalterable 64-bit ROM (8-bit family code 43h + 48-bit serial + 8-bit CRC) |
| Protection Granularity | Per-block (8-page / 2048-bit) write protection or EPROM-emulation mode; irreversible lock via 55h/AAh |
| ESD Rating | ±8kV contact discharge, ±15kV air discharge (IEC 1000-4-2 Level 4) |
Pinout & Package
DS28EC20+ uses a 3-pin TO-92 package with I/O (1-Wire bus interface, open-drain), GND (ground reference), and N.C. (not connected). The device draws power parasitically from the I/O line and requires an external pullup resistor (300Ω–2.2kΩ).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| I/O | 1-Wire bidirectional bus interface | Open-drain output with parasitic power harvesting; requires external pullup; handles all command, data, and presence signaling |
| GND | Ground reference | System ground return path for internal circuitry and I/O signal reference |
| N.C. | No connection | Internally unconnected pin; must remain floating or tied to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Backward compatibility | Fully compatible with DS2433 ROM commands and memory access flow; only tPROG extended from 5ms to 10ms |
| Scratchpad integrity | 256-bit volatile buffer with strict read/write protocol and PF flag validation ensures no partial writes reach EEPROM |
| Block-level security | 10 independent 2048-bit memory blocks each configurable for write-protect or EPROM-emulation (1→0 only) |
| Noise-immune interface | Hysteresis (0.30–1.3V) and filtering on I/O enable reliable operation in electrically noisy environments like industrial sensor nodes |
| Factory identity assurance | Unalterable 64-bit ROM guarantees absolute part identity and enables secure multidrop addressing without collision |
Applications
| Ink/Toner Cartridge Authentication | IEEE 1451.4 Sensor TEDS Storage |
|---|---|
Use Scenario: Embedded in printer consumables to store cryptographic keys, model ID, page count, and usage history. IC Role / Device Role / Timing Role: 1-Wire EEPROM providing tamper-resistant, uniquely identifiable nonvolatile storage accessible via low-pin-count bus. Use Value: Prevents third-party cartridge use through hardware-enforced authentication using factory-ROM identity and write-protected calibration data. |
Use Scenario: Mounted on analog sensor modules to store transducer electronic data sheets (TEDS) including calibration coefficients, serial number, and manufacturer info. IC Role / Device Role / Timing Role: Calibration data repository with guaranteed uniqueness and field-updatable parameters via 1-Wire interface. Use Value: Enables plug-and-play sensor integration by allowing host systems to auto-configure based on verified, immutable TEDS stored in DS28EC20+. |
| PCB Identification & Traceability | Wireless Base Station Module ID |
Use Scenario: Soldered onto printed circuit boards to store board revision, manufacturing date, test results, and firmware version. IC Role / Device Role / Timing Role: Permanent board-level identifier with write-once or write-protected fields ensuring traceability across lifecycle. Use Value: Eliminates manual labeling errors and supports automated optical inspection (AOI) and repair tracking via machine-readable 64-bit ROM. |
Use Scenario: Integrated into RF module assemblies in cellular infrastructure to store module type, calibration offsets, and regulatory certification data. IC Role / Device Role / Timing Role: Secure, low-overhead identity and configuration storage accessible during boot or maintenance via existing 1-Wire service port. Use Value: Enables remote diagnostics and firmware updates tied to verified hardware identity, reducing field failure root-cause analysis time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 1-Wire EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2433+T | 4kb capacity (128×32-bit), no EPROM-emulation mode, 5ms tPROG, lower ESD rating (±4kV) | Limited to basic identification; lacks block-level write protection and long-term calibration storage capability | Select when cost sensitivity outweighs security and capacity needs; not suitable for TEDS or high-reliability authentication |
| DS28E05+T | 1kb capacity (32×32-bit), same TO-92 package, identical 1-Wire timing, but no register page or block protection | Only supports simple serial number storage; no user EEPROM or factory ID fields | Choose for minimal footprint and lowest BOM cost where advanced security and multi-field storage are unnecessary |
Compared with DS2433+T and DS28E05+T, the DS28EC20+ provides 5× more memory, irreversible block-level security, factory-programmed identity, and full IEEE 1451.4 TEDS support - making it the only option among the three qualified for medical sensor calibration and consumable anti-counterfeiting.
Availability
DS28EC20+ is available at Aetrix Electronics and suitable for ink/toner cartridge authentication, IEEE 1451.4 sensor TEDS storage, and PCB identification requiring stable component supply across industrial, medical, and telecom equipment lifecycles.
Supply support for DS28EC20+ 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
Analog Devices, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and connectivity applications.
The DS28EC20+ belongs to Analog Devices' 1-Wire secure memory product line, designed specifically for device authentication, calibration data storage, and system-level identification in resource-constrained, low-pin-count embedded systems.
FAQ
What is the memory organization of the DS28EC20+?
The DS28EC20+ contains 20480 bits of EEPROM organized as 80 pages of 256 bits (32 bytes) each, plus one dedicated control register page starting at address 0A00h. It also includes a 256-bit volatile scratchpad used for verify-before-copy writes. Each 8-page group (2048-bit block) can be independently configured for write protection or EPROM-emulation mode via protection bytes in the register page.
Does the DS28EC20+ require an external power supply?
No - the DS28EC20+ operates in parasitic-power mode, drawing all operating energy from the 1-Wire I/O line. It requires only an external pullup resistor (300Ω–2.2kΩ) on the I/O line and does not need a separate VCC connection. This simplifies PCB layout and reduces component count in space-constrained designs such as ink cartridges or sensor modules.
How does the DS28EC20+ ensure data integrity during writes?
The DS28EC20+ enforces data integrity using a two-step write process: data is first written to the 256-bit scratchpad and verified by the host, then copied to EEPROM only after confirmation. The E/S register includes a Power Failure (PF) flag that indicates invalid scratchpad contents due to power loss or bit misalignment, preventing corrupted data from being committed to nonvolatile memory.
Can the DS28EC20+ replace the DS2433 in existing designs?
Yes - the DS28EC20+ is highly backward-compatible with the DS2433. Identical ROM function commands and memory access protocols are supported. The only required change is extending the programming duration (tPROG) from 5ms to 10ms. All other timing, voltage, and pinout requirements remain unchanged, enabling drop-in upgrades for higher capacity and enhanced security.
What is the purpose of the 64-bit ROM in the DS28EC20+?
Each DS28EC20+ has a factory-programmed, unalterable 64-bit ROM consisting of an 8-bit family code (43h), 48-bit unique serial number, and 8-bit CRC. This ROM enables absolute device identification and collision-free multidrop addressing on shared 1-Wire buses - essential for authentication, calibration traceability, and secure system configuration in applications like medical sensors and wireless base stations.
DS28EC20+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 20Kbit
- Memory Organization:
- 256 x 80
- Memory Interface:
- 1-Wire®
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
DS28EC20+ FAQ
1.How can I place an order for DS28EC20+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS28EC20+ 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 DS28EC20+ reliable?
The price and inventory of DS28EC20+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS28EC20+ is usually 5 days.
3.What payment methods are accepted for DS28EC20+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS28EC20+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS28EC20+?
DS28EC20+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS28EC20+ 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 DS28EC20+?
For technical support, including DS28EC20+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS28EC20+ requirements.
6.How does Aetrix verify that DS28EC20+ is sourced from the original manufacturer or authorized distributors?
All DS28EC20+ 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 DS28EC20+ meets industry standards.
7.What is the process for return or replacement of DS28EC20+?
All DS28EC20+ units undergo pre-shipment inspection (PSI). If there is an issue with DS28EC20+, 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 DS28EC20+ part is unused and in its original packaging.
Return procedure for DS28EC20+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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