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Analog Devices Inc./Maxim Integrated DS28EC20P+T
- Part No.:
- DS28EC20P+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- 6-SMD, J-Lead
- Datasheet:
-
DS28EC20P+T.pdf
- Description:
- IC EEPROM 20KBIT 1-WIRE 6TSOC
- Quantity:
- Payment:
- Shipping:
Inventory:1,398
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Product details
Overview
DS28EC20P+T from Analog Devices is a 20480-bit, 1-Wire® EEPROM organized as 80 pages of 256 bits each, with an additional control page. It features 64-bit unique ROM addressing, 8-page block write protection/EPROM-emulation mode, and operates on a single-conductor bus at 15.4kbps or 90kbps. Used in ink cartridge identification, medical sensor calibration, and PCB authentication.
For engineers reviewing the DS28EC20P+T datasheet, DS28EC20P+T pinout, DS28EC20P+T application, or DS28EC20P+T equivalent, key selection considerations include its TSOC-6 package, 4V–5.25V/3.135V–3.465V dual supply support, 200k write/erase cycles at +25°C, 40-year data retention at +85°C, and backward compatibility with DS2433 (with extended tPROG).
Technical Context
The DS28EC20P+T implements a parasitically powered 1-Wire interface with strict timing compliance for standard (65µs timeslot) and overdrive (11µs timeslot) modes. Its memory architecture includes a 32-byte scratchpad for verified writes, eight 2Kb blocks with independent write-protection or EPROM-emulation control via register page addresses 0A00h–0A09h, and factory-programmed 64-bit ROM with CRC-8 validation.
It supports two operating voltage ranges: 4V–5.25V at –40°C to +85°C and 3.135V–3.465V at 0°C to +70°C. Switchpoint hysteresis (0.30–1.3V) and ±8kV contact ESD protection ensure robust noise immunity in industrial and medical environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Memory | 20480 bits (80 × 256-bit pages), plus dedicated control page |
| Interface | Single-conductor 1-Wire bus, compatible with DS2433 protocol (tPROG extended to 10ms) |
| Write Endurance | 200k cycles at +25°C; degrades to 50k at +85°C |
| Data Retention | 40 years at +85°C - enables long-term calibration storage without refresh |
| Supply Range | 4V–5.25V (–40°C to +85°C) or 3.135V–3.465V (0°C to +70°C) |
| ESD Protection | ±8kV contact discharge (IEC 1000-4-2 Level 4), critical for field-deployed sensors |
| Unique ID | Factory-programmed 64-bit ROM with CRC-8 - ensures unambiguous device addressing in multidrop nets |
Pinout & Package
DS28EC20P+T uses a 6-pin TSOC (Thin Small Outline Package) with gull-wing leads, optimized for space-constrained PCBs in ink cartridges and medical disposables.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| I/O | 1-Wire bidirectional bus | Open-drain interface requiring external pullup; supplies parasitic power during reads/writes |
| GND | Ground reference | Return path for I/O current and internal circuitry; must be low-impedance for reliable presence detection |
| N.C. | No connection | Internally unconnected pin; must remain floating - no routing or soldering required |
| VDD (not used) | Not applicable | Device operates parasitically; no VDD pin present in TSOC package variant |
Key Features
| Feature | Design Value |
|---|---|
| Block-level write protection | Eight 2Kb memory blocks independently lockable via register byte (55h = write-protect, AAh = EPROM mode) |
| Scratchpad integrity verification | 32-byte volatile buffer allows read-back before EEPROM commit - prevents corrupted writes due to line glitches |
| Backward-compatible timing | Standard-speed 1-Wire timing matches legacy DS2433 except tPROG (10ms vs. 5ms), enabling drop-in firmware updates |
| Dual-voltage operation | Supports both 3.3V and 5V systems without redesign - simplifies reuse across product families |
| Factory-programmed ROM | Unalterable 64-bit ID with CRC-8 ensures tamper-resistant device identity for authentication workflows |
Applications
| Ink/Toner Cartridge Authentication | Medical Sensor Calibration Storage |
|---|---|
Use Scenario: Embedded in OEM printer cartridges to store ink level, model ID, and usage history. IC Role / Device Role / Timing Role: 1-Wire EEPROM providing secure, low-pin-count memory for anti-counterfeit authentication handshake. Use Value: Prevents third-party cartridge use via unique ROM ID and write-protected calibration data - extends OEM revenue stream. | Use Scenario: Mounted on disposable medical sensor probes to retain factory calibration coefficients and serial traceability. IC Role / Device Role / Timing Role: Nonvolatile memory storing IEEE 1451.4 TEDS-compliant sensor metadata with EPROM-emulation mode for one-time-write safety-critical values. Use Value: Enables plug-and-play calibration without host-side database lookup - reduces clinical setup time and eliminates manual entry errors. |
| PCB Identification & Traceability | Wireless Base Station Module Tagging |
Use Scenario: Soldered onto high-reliability PCBs (e.g., telecom backplanes) to encode revision, date code, and test results. IC Role / Device Role / Timing Role: Tamper-evident board ID storage with copy protection enabled on register page - prevents unauthorized reprogramming. Use Value: Supports automated optical inspection (AOI) and ERP integration via 1-Wire scan - eliminates manual barcode scanning in manufacturing. | Use Scenario: Integrated into RF module assemblies for remote base station cabinets to track firmware version, calibration date, and thermal history. IC Role / Device Role / Timing Role: Low-power, noise-immune memory interfacing with microcontroller over 1-Wire bus in electrically noisy RF environments. Use Value: Enables field-upgradeable module identification without adding I²C lines - reduces BOM count and layout complexity. |
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 | 8Kb (32 pages), no EPROM-emulation mode, 5ms tPROG, TO-92/TSOC packages available | Lacks block-level OTP capability; suitable only for basic read/write storage without permanent write-locking | Select when cost sensitivity outweighs need for advanced protection or higher density |
| DS28EC20Q+T | Same memory and features, but in 6-pin TDFN (2mm × 2mm) instead of TSOC (3.05mm × 1.4mm) | Smaller footprint and better thermal performance; requires rework of land pattern and stencil | Select for ultra-compact designs where board area is constrained more than assembly flexibility |
Compared with DS2433+T, DS28EC20P+T delivers 2.5× memory capacity and hardware-enforced EPROM mode for safety-critical fields; compared with DS28EC20Q+T, it offers larger pad spacing and proven manufacturability in high-volume cartridge assembly.
Availability
DS28EC20P+T is available at Aetrix Electronics and suitable for ink cartridge authentication, medical sensor calibration, and PCB identification requiring stable component supply across automotive, industrial, and healthcare production programs.
Supply support for DS28EC20P+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.
The DS28EC20P+T belongs to Analog Devices' 1-Wire EEPROM product line, designed specifically for secure, low-pin-count device identification and calibration data storage in consumables, medical disposables, and modular electronics.
FAQ
What is the package type and lead count for DS28EC20P+T?
The DS28EC20P+T uses a 6-pin TSOC (Thin Small Outline Package) with gull-wing leads. It contains three functional terminals - I/O, GND, and N.C. - and no VDD pin, as it operates parasitically from the 1-Wire bus. The TSOC footprint measures 3.05mm × 1.4mm, making it suitable for compact ink cartridge and sensor PCBs. This exact package is confirmed in the Analog Devices ordering table for DS28EC20P+T.
Does DS28EC20P+T support both 3.3V and 5V operation?
Yes, DS28EC20P+T supports dual supply ranges: 4V–5.25V at –40°C to +85°C and 3.135V–3.465V at 0°C to +70°C. The device derives power parasitically from the I/O line in both cases and does not require a separate VDD connection. This dual-voltage capability is explicitly specified in the "ELECTRICAL CHARACTERISTICS" sections of the Analog Devices datasheet for DS28EC20P+T.
How does the EPROM-emulation mode work in DS28EC20P+T?
In DS28EC20P+T, EPROM-emulation mode is enabled per 2Kb memory block (8 pages) by writing 0xAA to the corresponding protection byte (e.g., 0xA00h for Block 0). Once set, bits can only transition from 1 to 0 - irreversible writes mimicking EPROM behavior. This mode is ideal for storing safety-critical calibration constants that must never be altered post-deployment. The feature is implemented in hardware and cannot be disabled once activated.
Is DS28EC20P+T pin-compatible with DS2433?
No, DS28EC20P+T is not pin-compatible with DS2433 in TSOC packaging. While both offer TSOC variants, DS2433 TSOC has different pin assignments (e.g., VDD present) and lacks the N.C. pin configuration of DS28EC20P+T. However, DS28EC20P+T maintains protocol-level backward compatibility with DS2433 - requiring only firmware adjustment for the extended 10ms programming time (tPROG).
What is the maximum number of DS28EC20P+T devices supported on a single 1-Wire bus?
The DS28EC20P+T supports multidrop operation using its unique 64-bit ROM address, and the theoretical limit is determined by bus capacitance and pullup design - not by the device itself. Analog Devices confirms reliable operation with >100 devices on properly terminated buses using active pullups (e.g., DS2482). Each DS28EC20P+T responds only to commands addressed to its ROM ID, enabling scalable system identification without address conflicts.
DS28EC20P+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-SMD, J-Lead
- 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:
- Surface Mount
- Supplier Device Package:
- 6-TSOC
DS28EC20P+T FAQ
1.How can I place an order for DS28EC20P+T through Aetrix?
Please submit a Request for Quotation (RFQ) for DS28EC20P+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 DS28EC20P+T reliable?
The price and inventory of DS28EC20P+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS28EC20P+T is usually 5 days.
3.What payment methods are accepted for DS28EC20P+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS28EC20P+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS28EC20P+T?
DS28EC20P+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS28EC20P+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 DS28EC20P+T?
For technical support, including DS28EC20P+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS28EC20P+T requirements.
6.How does Aetrix verify that DS28EC20P+T is sourced from the original manufacturer or authorized distributors?
All DS28EC20P+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 DS28EC20P+T meets industry standards.
7.What is the process for return or replacement of DS28EC20P+T?
All DS28EC20P+T units undergo pre-shipment inspection (PSI). If there is an issue with DS28EC20P+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 DS28EC20P+T part is unused and in its original packaging.
Return procedure for DS28EC20P+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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