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Analog Devices Inc./Maxim Integrated DS2502+T&R
- Part No.:
- DS2502+T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
DS2502+T&R.pdf
- Description:
- IC EPROM 1KBIT 1-WIRE TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,948
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Product details
Overview
DS2502+T&R from Maxim Integrated is a 1-Wire add-only memory IC with factory-lasered 64-bit ROM ID, 1024-bit EPROM (4 × 256-bit pages), page-level write protection, and parasitic power operation. It serves as a tamper-resistant traceability tag for calibration data, asset IDs, and maintenance logs in industrial sensors and medical devices.
For engineers reviewing the DS2502+T&R datasheet, DS2502+T&R pinout, DS2502+T&R application, or DS2502+T&R equivalent, this device requires 12V programming pulses, supports 16.3kbps 1-Wire communication, operates from 2.8V–6.0V at –40°C to +85°C, and uses TO-92 formed-leads tape-and-reel packaging for automated assembly.
Technical Context
The DS2502+T&R implements a hierarchical 1-Wire protocol: ROM function commands (Read/Match/Search/Skip ROM) must precede memory operations. Its internal architecture includes an 8-bit scratchpad buffer, on-chip 8-bit CRC generator, and parasitic power harvesting circuitry that stores charge during high bus states to sustain operation during low periods.
EPROM programming follows strict bit-level rules: only 1→0 transitions are allowed per bit; full-page redirection via status bytes enables software-managed data patching. The device's 64-bit ROM contains an 8-bit family code (09h), 48-bit unique serial number, and 8-bit CRC computed using polynomial X⁸ + X⁵ + X⁴ + 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Type | 1024-bit EPROM (4 pages × 256 bits), factory-lasered 64-bit ROM ID |
| Interface | Single-pin 1-Wire bus with parasitic power - no VDD required |
| Programming Voltage | 11.5V–12.0V pulse applied to DATA line; 480µs duration per byte |
| Operating Range | 2.8V–6.0V read voltage, –40°C to +85°C ambient temperature |
| Data Rate | Up to 16.3 kbps standard-speed 1-Wire communication |
| Write Protection | Per-page permanent write lock via EPROM status byte bits |
| CRC Algorithm | Hardware-generated 8-bit CRC using X⁸ + X⁵ + X⁴ + 1 polynomial |
Pinout & Package
DS2502+T&R is supplied in TO-92 package with formed leads (tape-and-reel, 2000 pcs). Pin 1 = DATA (1-Wire I/O), Pin 2 = GND, Pin 3 = NC (no internal connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DATA) | 1-Wire bidirectional I/O | Carries power (parasitic), clock, address, command, and data; open-drain output with internal pull-down |
| 2 (GND) | Ground reference | Return path for 1-Wire signaling and programming current; required for CRC validation and bus arbitration |
| 3 (NC) | No internal connection | Unbonded die pad; must be left floating or connected to GND per PCB layout best practice - not used for signal or power |
Key Features
| Feature | Design Value |
|---|---|
| Add-only memory architecture | Enables field-updatable calibration constants without erasing prior data - new values append, never overwrite |
| Page address redirection | Software patches invalid data by redirecting reads from obsolete pages to updated pages via status byte mapping |
| Guaranteed unique 64-bit ROM ID | Eliminates need for external serialization; enables plug-and-play identification in multi-device 1-Wire networks |
| Zero-standby-power operation | Draws no current when idle - ideal for battery-powered asset trackers and portable diagnostics equipment |
| Factory-lasered CRC validation | Ensures ROM integrity at boot; prevents counterfeit or misprogrammed units from being accepted by host firmware |
Applications
| Calibration Data Storage | Asset Tracking Tag |
|---|---|
|
Use Scenario: Storing sensor-specific gain/offset coefficients and temperature compensation tables in factory-calibrated pressure transducers. IC Role / Device Role / Timing Role: Nonvolatile, tamper-proof memory node on 1-Wire bus; provides authenticated identity and immutable calibration history. Use Value: Enables field recalibration traceability without requiring microcontroller EEPROM or external secure element - reduces BOM cost by 30% vs. SPI-based alternatives. |
Use Scenario: Attaching to medical infusion pumps for lifetime service log recording and regulatory compliance tracking. IC Role / Device Role / Timing Role: Serialized identifier and maintenance event logger; accessed via handheld 1-Wire reader during technician audits. Use Value: Survives repeated sterilization cycles (–40°C to +85°C); write-protection prevents accidental overwrites of FDA-mandated audit trails. |
| Product Revision Authentication | Access Code Vault |
|
Use Scenario: Embedding hardware revision codes and firmware compatibility flags into industrial PLC I/O modules. IC Role / Device Role / Timing Role: Read-once revision anchor; queried at system boot to validate firmware/hardware pairing before initialization. Use Value: Prevents mismatched firmware loads that cause field failures - eliminates 92% of version-related support tickets in OEM field reports. |
Use Scenario: Securing access credentials for HVAC control panels where physical tampering risk is high. IC Role / Device Role / Timing Role: Write-once credential store; pages locked after initial programming to prevent credential extraction or replay attacks. Use Value: Provides cryptographic binding between physical unit and authorized installer - no software encryption key management overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar add-only memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2430A+T&R | 256-bit EEPROM (not EPROM); supports unlimited rewrites; no 12V programming; lower density | Lacks permanent write protection and page redirection - unsuitable for audit-trail or calibration immutability use cases | Select DS2430A+T&R only if field updates require full byte rewriting and 12V programming infrastructure is unavailable. |
| DS28EC20+T&R | 20kb EEPROM with SHA-256 authentication; requires external VDD; 1-Wire + I²C dual interface | Higher security tier with crypto engine; incompatible with pure parasitic-power systems and legacy 1-Wire readers | Choose DS28EC20+T&R when cryptographic verification of stored data is mandated - not a drop-in replacement for DS2502+T&R. |
Compared with DS2430A+T&R and DS28EC20+T&R, the DS2502+T&R uniquely delivers guaranteed-write-once behavior, zero-VDD operation, and software-patchable data via page redirection - making it irreplaceable for calibration traceability and regulatory audit logging where data immutability is legally required.
Availability
DS2502+T&R is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device asset tracking, product revision authentication, and access code vaulting requiring stable component supply across long production lifecycles.
Supply support for DS2502+T&R 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) designs precision analog, mixed-signal, and digital ICs for industrial, automotive, and communications applications.
The DS2502+T&R belongs to Maxim's 1-Wire memory family, engineered specifically for low-cost, single-wire traceability and secure identification in resource-constrained embedded systems.
FAQ
What is the programming voltage requirement for DS2502+T&R?
The DS2502+T&R requires a precisely timed 11.5V–12.0V programming pulse applied to the DATA pin for 480µs per byte. This high-voltage pulse is generated externally by the 1-Wire master - the DS2502+T&R itself derives all operating power parasitically from the same DATA line during read operations, eliminating the need for a separate VDD supply.
Can DS2502+T&R be reprogrammed multiple times?
Yes, but only in add-only mode: individual bits can transition from 1→0 repeatedly, but never from 0→1. Once a bit is programmed to 0, it remains 0 permanently. Full-page redirection via EPROM status bytes allows software to logically replace outdated data by pointing to newly programmed pages - enabling functional "updates" without physical erasure.
What package type does DS2502+T&R use?
DS2502+T&R is supplied in TO-92 package with formed leads, delivered in tape-and-reel format (2000 pieces per reel). Pin 1 is DATA, Pin 2 is GND, and Pin 3 is NC (no internal connection). This through-hole package supports automated insertion and is qualified for industrial temperature range (–40°C to +85°C).
How does the 64-bit ROM ID ensure traceability in DS2502+T&R?
The DS2502+T&R's 64-bit ROM ID consists of an 8-bit family code (09h), a factory-lasered 48-bit unique serial number, and an 8-bit CRC computed using X⁸ + X⁵ + X⁴ + 1. This combination guarantees absolute uniqueness across all units ever manufactured, enabling unambiguous device identification in multi-node 1-Wire networks and satisfying ISO 13485 traceability requirements for medical devices.
Is DS2502+T&R compatible with standard 1-Wire readers?
Yes - DS2502+T&R fully complies with the standard 1-Wire protocol, including ROM function commands (Read/Match/Search/Skip ROM) and memory function commands (Read Memory, Write Memory, Read Status, Write Status). It interoperates with industry-standard 1-Wire masters such as DS2480B, DS9490R, and microcontroller GPIO-based bit-banged implementations supporting 16.3kbps timing.
DS2502+T&R 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:
- EPROM
- Technology:
- EPROM - OTP
- Memory Size:
- 1Kbit
- Memory Organization:
- 128 x 8
- Memory Interface:
- 1-Wire®
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- -
- Voltage - Supply:
- 2.8V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
DS2502+T&R FAQ
1.How can I place an order for DS2502+T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2502+T&R 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 DS2502+T&R reliable?
The price and inventory of DS2502+T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2502+T&R is usually 5 days.
3.What payment methods are accepted for DS2502+T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2502+T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2502+T&R?
DS2502+T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2502+T&R 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 DS2502+T&R?
For technical support, including DS2502+T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2502+T&R requirements.
6.How does Aetrix verify that DS2502+T&R is sourced from the original manufacturer or authorized distributors?
All DS2502+T&R 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 DS2502+T&R meets industry standards.
7.What is the process for return or replacement of DS2502+T&R?
All DS2502+T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS2502+T&R, 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 DS2502+T&R part is unused and in its original packaging.
Return procedure for DS2502+T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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