MAXIM INTEGRATED PRODUCTS DS2502 1 kbit Add-Only Memory
Summary
Secure physical assets and ensure absolute product traceability using this specialized 1 kbit Add-Only Memory chip. Featuring a factory-lasered, unique 48-bit serial number and user-programmable EPROM, it stores essential non-volatile data—ideal for asset tracking, maintenance records, and serialization. This device minimizes complexity by communicating via the single-conductor 1-Wire protocol, compatible with standard microcontrollers. Technical documentation provides detailed guides on integration, addressing minimum components needed for robust industrial or IoT applications.
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DS2502
1 kbit Add-Only Memory
www.maxim-ic.com
FEATURES PIN ASSIGNMENT
1024 bits Electrically Programmable Read
TO-92 NC NC
Only Memory (EPROM) communicates with
DS2502 NC NC
the economy of one signal plus ground
DATA NC
Unique, factory-lasered and tested 64-bit
GND NC
registration number (8-bit family code + 48- bit serial number + 8-bit CRC tester) assures
8-PIN SO (150 MIL)
absolute traceability because no two parts are alike Built-in multidrop controller ensures TSOC PACKAGE compatibility with other Micro LAN products
GND NC
EPROM partitioned into four 256-bit pages
DATA NC
for randomly accessing packetized data NC NC Each memory page can be permanently
TOP VIEW
write-protected to prevent tampering
3.7 X 4.0 X 1.5 mm Device is an “add only” memory where See Mech. Drawings Section
additional data can be programmed into
EPROM without disturbing existing data SOT-23 (3-pin) PACKAGE Architecture allows software to patch data by superseding an old page in favor of a newly
1 = IO
programmed page BOTTOM VIEW
2,3 = GND
Reduces control, address, data, power, and programming signals to a single data pin
TOP VIEW Directly connects to a single port pin of a SOT-23
microprocessor and communicates at up to 16.3 kbits per second 8-bit family code specifies DS2502 communications requirements to reader Presence detector acknowledges when the reader first applies voltage Low cost TO-92 or 8-pin SO, SOT-23 (3- pin) and TSOC surface mount package Reads over a wide voltage range of 2.8V to 6.0V from -40°C to +85°C; programs at 11.5V to 12.0V from -40°C to +50°C
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Page Summary Contents For MAXIM INTEGRATED PRODUCTS DS2502 1 kbit Add-Only Memory
Manual Details
| Brand | Maxim Integrated |
|---|---|
| Pages | 23 |
| File Size | 387.01 KB |
| Published | May 26, 2026 |
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Frequently Asked Questions
How is data uniqueness guaranteed for this device?
It features a factory-lasered registration number including a unique 48-bit serial number and an 8-bit CRC.
What communication protocol does the DS2502 use?
It uses the 1-Wire protocol, requiring only a single data lead and ground return for power and data transfer.
Can I update data if some pages are read-only?
Yes; new data must be appended rather than overwriting existing data, and pages can be write-protected to prevent tampering.
What is the wide operating temperature range?
The device operates in the wide range of -40°C to +85°C for read operations.