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Analog Devices Inc./Maxim Integrated DS28EC20+T
- Part No.:
- DS28EC20+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
DS28EC20+T.pdf
- Description:
- IC EEPROM 20KBIT 1-WIRE TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,659
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Product details
Overview
DS28EC20+T from Analog Devices is a 20480-bit, 1-Wire® EEPROM in TO-92 package with 80 pages × 256 bits, unique 64-bit ROM ID, and programmable write protection per 8-page block. It operates from 4V to 5.25V at -40°C to +85°C and supports standard (15.4kbps) and overdrive (90kbps) 1-Wire communication for device authentication and calibration data storage.
For engineers reviewing the DS28EC20+T datasheet, DS28EC20+T pinout, DS28EC20+T application, or DS28EC20+T equivalent, this page delivers verified electrical specs, TO-92 terminal mapping, EPROM-emulation mode behavior, 200k write/erase endurance, and backward compatibility with DS2433 - all critical for secure sensor TEDS, ink cartridge ID, and PCB traceability designs.
Technical Context
The DS28EC20+T implements a parasitically powered 1-Wire interface with strict timing compliance: tRSTL = 480–640µs (standard), tW0L = 60–120µs, and tPROG = 10ms for EEPROM programming. Its memory architecture includes a 32-byte scratchpad for data verification prior to EEPROM commit and dedicated register page (0A00h–0A1Fh) for per-block protection control.
It features factory-programmed 64-bit ROM with 8-bit family code (0x43), 48-bit serial number, and 8-bit CRC-8 (X⁸+X⁵+X⁴+1). Switchpoint hysteresis (VHY = 0.30–1.3V) and ±8kV contact ESD rating ensure robust operation in noisy industrial environments without external protection circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Memory | 20480 bits (80 × 256-bit pages), plus 1 control page - enables full calibration datasets per device. |
| 1-Wire Speed | 15.4kbps (standard) or 90kbps (overdrive) - overdrive requires 4–5.25V supply and enables faster field updates. |
| Write Endurance | 200k cycles at +25°C; 50k cycles at +85°C - defines usable lifetime in high-temp embedded deployments. |
| Data Retention | 40 years at +85°C - guarantees long-term integrity of calibration or authentication data without refresh. |
| Supply Range | 4V to 5.25V at -40°C to +85°C; 3.135V to 3.465V at 0°C to +70°C - dual-voltage support for legacy and low-power systems. |
| ESD Rating | ±8kV contact discharge (IEC 1000-4-2 Level 4) - eliminates need for external TVS in most industrial wiring scenarios. |
| Unique ID | Factory-programmed 64-bit ROM (8-bit family code 0x43 + 48-bit serial + 8-bit CRC) - enables unambiguous device addressing in multidrop buses. |
Pinout & Package
DS28EC20+T uses a 3-pin TO-92 package with I/O (open-drain 1-Wire bus), GND, and N.C. terminals. The N.C. pin is internally unconnected and must remain floating or grounded per layout guidelines; no internal bonding or function is assigned.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| I/O | 1-Wire bidirectional data line | Open-drain interface requiring external pullup (300Ω–2.2kΩ); supplies parasitic power during read/write operations. |
| GND | Ground reference | Return path for I/O current and internal logic; must be connected to system ground with low-impedance trace. |
| N.C. | No connection | Internally unconnected; may be left unpopulated or tied to GND for mechanical stability - no electrical effect. |
Key Features
| Feature | Design Value |
|---|---|
| Per-block write protection | Eight 2048-bit blocks (8 pages each) individually configurable via register page - prevents unauthorized firmware or calibration overwrite. |
| EPROM-emulation mode | Blocks set to "write-to-0 only" (0xAA) emulate one-time-programmable behavior - ideal for immutable security keys or factory settings. |
| Scratchpad data verification | 32-byte volatile buffer allows read-back before EEPROM commit - eliminates corrupted writes due to bus glitches or power loss. |
| Backward compatibility | Protocol-level compatible with DS2433 except tPROG extended from 5ms to 10ms - enables drop-in upgrade in existing 1-Wire systems. |
| Factory-managed manufacturer ID | Customer-defined 2-byte ID stored at 0xA23–0xA24 (enabled by factory byte 0xA20 = 0xAA) - supports OEM branding and supply-chain traceability. |
Applications
| IEEE 1451.4 Sensor TEDS | Ink/Toner Cartridge ID |
|---|---|
Use Scenario: Storing calibration coefficients, sensor type, and manufacturer data in smart analog sensors compliant with IEEE-P1451.4. IC Role / Device Role / Timing Role: Nonvolatile 1-Wire memory providing tamper-resistant, uniquely identifiable TEDS storage accessible via single-wire interface. Use Value: Eliminates separate I²C/UART EEPROM and simplifies sensor module design while ensuring calibration data survives power cycles and field replacement. |
Use Scenario: Authenticating OEM ink or toner cartridges in printers and MFPs to prevent counterfeit usage. IC Role / Device Role / Timing Role: Secure identity token with write-protected memory blocks storing cryptographic keys and usage counters. Use Value: Enables cartridge lifecycle tracking and prevents unauthorized refills using hardware-enforced write protection and unique ROM ID. |
| Medical Sensor Calibration | PCB Identification & Traceability |
Use Scenario: Storing factory-calibrated offset/gain values and sensor serial numbers on disposable medical probes and wearable biosensors. IC Role / Device Role / Timing Role: Tamper-evident calibration memory with 40-year data retention at +85°C - meets ISO 13485 long-term storage requirements. Use Value: Ensures regulatory-compliant calibration persistence across sterilization cycles and shelf life without battery-backed RAM. |
Use Scenario: Embedding board revision, manufacturing date, test results, and configuration flags directly onto PCBs for automated assembly and field diagnostics. IC Role / Device Role / Timing Role: Single-pin, low-cost identification node enabling rapid board-level inventory scanning and firmware matching. Use Value: Reduces BOM complexity versus I²C EEPROMs and enables real-time traceability in high-mix production lines using standard 1-Wire readers. |
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 | 1024-bit capacity (4 pages × 256 bits), no per-block protection or EPROM mode, tPROG = 5ms | Limited to basic identification; unsuitable for multi-parameter TEDS or large calibration tables | Select DS2433+T only when memory size and security features are not required - lower cost but no upgrade path. |
| DS28E05+T | 1024-bit EEPROM, integrated SHA-1 authentication engine, 1-Wire crypto coprocessor | Supports challenge-response authentication; higher security but no EPROM-emulation or block protection | Choose DS28E05+T when cryptographic proof-of-authenticity is mandatory - DS28EC20+T offers larger memory and flexible protection instead. |
Compared with DS2433+T and DS28E05+T, the DS28EC20+T provides the largest memory (20Kb), granular 8-page block protection, and EPROM-emulation mode - making it optimal for complex calibration storage and non-crypto device authentication where data volume and write flexibility outweigh cryptographic needs.
Availability
DS28EC20+T is available at Aetrix Electronics and suitable for device authentication, sensor TEDS storage, and PCB identification requiring stable component supply across industrial, medical, and consumer electronics programs.
Supply support for DS28EC20+T 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 reliable connectivity.
The DS28EC20+T belongs to Analog Devices' 1-Wire secure memory product line, designed specifically for robust, low-pin-count device identification and calibration data storage in harsh or space-constrained environments.
FAQ
What is the operating voltage range for DS28EC20+T?
The DS28EC20+T operates from 4V to 5.25V across its full temperature range of -40°C to +85°C. At 0°C to +70°C, it supports a reduced 3.135V to 3.465V supply range. Operation outside these ranges risks communication failure or EEPROM corruption - always verify VPUP and RPUP values against the 5V or 3.3V EC tables in the datasheet.
How does the EPROM-emulation mode work in DS28EC20+T?
In DS28EC20+T, EPROM-emulation mode is enabled by writing 0xAA to a block's protection byte (e.g., address 0xA00h for Block 0). Once set, that 2048-bit block allows only 1→0 bit transitions - mimicking OTP behavior. This is irreversible per block and ensures factory-set parameters like calibration constants cannot be altered post-deployment.
Is DS28EC20+T pin-compatible with DS2433?
Yes, DS28EC20+T shares identical TO-92 pinout (I/O, GND, N.C.) and 1-Wire protocol with DS2433, enabling direct PCB replacement. However, DS28EC20+T requires 10ms programming time (vs. 5ms for DS2433), so host firmware must be updated to accommodate the longer tPROG interval to avoid timeout errors.
What is the purpose of the N.C. pin on DS28EC20+T?
The N.C. pin on DS28EC20+T is internally unconnected and serves no electrical function. It may be left unpopulated, tied to GND for mechanical reinforcement, or omitted from the footprint - none of these choices affect DS28EC20+T operation. Do not route signals or apply voltage to this pin.
Can DS28EC20+T operate in overdrive mode at 3.3V supply?
No. DS28EC20+T overdrive mode (90kbps) requires VPUP between 4V and 5.25V - it is explicitly disabled at 3.3V. At 3.135–3.465V, only standard-speed communication (15.4kbps) is guaranteed. Attempting overdrive at 3.3V will result in unreliable reset detection and data corruption.
DS28EC20+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for DS28EC20+T through Aetrix?
Please submit a Request for Quotation (RFQ) for DS28EC20+T 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+T reliable?
The price and inventory of DS28EC20+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS28EC20+T is usually 5 days.
3.What payment methods are accepted for DS28EC20+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS28EC20+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS28EC20+T?
DS28EC20+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS28EC20+T 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+T?
For technical support, including DS28EC20+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS28EC20+T requirements.
6.How does Aetrix verify that DS28EC20+T is sourced from the original manufacturer or authorized distributors?
All DS28EC20+T 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+T meets industry standards.
7.What is the process for return or replacement of DS28EC20+T?
All DS28EC20+T units undergo pre-shipment inspection (PSI). If there is an issue with DS28EC20+T, 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+T part is unused and in its original packaging.
Return procedure for DS28EC20+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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