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Maxim > Products > 1-Wire® Devices 
DS2502
1Kb Add-Only Memory


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Data Sheet
FULL DATA SHEET (PDF, 648kB)
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Description
The DS2502 1Kb Add-Only Memory identifies and stores relevant information about the product to which it is associated. This lot- or product-specific information can be accessed with minimal interface—for example, a single port pin of a microcontroller. The DS2502 consists of a factory-lasered registration number that includes a unique 48-bit serial number, an 8-bit CRC, and an 8-bit Family Code (09h) plus 1Kb of EPROM which is user-programmable. The power to program and read the DS2502 is derived entirely from the 1-Wire® communication line.

Data is transferred serially via the 1-Wire protocol which requires only a single data lead and a ground return. The entire device can be programmed and then write-protected if desired. Alternatively, the part may be programmed multiple times with new data being appended to, but not overwriting, existing data with each subsequent programming of the device. Note: Individual bits can be changed only from a logical 1 to a logical 0, never from a logical 0 to a logical 1. A provision is also included for indicating that a certain page or pages of data are no longer valid and have been replaced with new or updated data that is now residing at an alternate page address. This page address redirection allows software to patch data and enhance the flexibility of the device as a stand-alone database. The 48-bit serial number that is factory-lasered into each DS2502 provides a guaranteed unique identity which allows for absolute traceability. The familiar TO-92 or SOIC or TSOC packages provide a compact enclosure that allows standard assembly equipment to handle the device easily for attachment to printed circuit boards or wiring. Typical applications include storage of calibration constants, maintenance records, asset tracking, product revision status, and access codes.

NOTE: This product requires use of the following:

  • DS2502K Evaluation Kit Software

    Key Features
    • 1024 bits Electrically Programmable Read Only Memory (EPROM) communicates with the economy of one signal plus ground
    • Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures absolute traceability because no two parts are alike
    • Built-in multidrop controller ensures compatibility with other MicroLAN products
    • EPROM partitioned into four 256-bit pages for randomly accessing packetized data
    • Each memory page can be permanently write-protected to prevent tampering
    • Device is an "add only" memory where additional data can be programmed into EPROM without disturbing existing data
    • Architecture allows software to patch data by superseding an old page in favor of a newly programmed page
    • Reduces control, address, data, power, and programming signals to a single data pin
    • Directly connects to a single port pin of a 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), TSOC and flip chip 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

    Key Specifications:   Memory (EPROM, EEPROM, ROM, NV SRAM)
    Part Number Memory Type Memory Size Bus Type Real-Time Clock DIP with Internal Battery PowerCap Package Battery Monitor With GPIO Single Piece Module Features Supply Voltage (min) (V) Supply Voltage (max) (V) Price**
    DS2502  EPROM 1K x 1 1-Wire No No No No No No
    •Add-Only Memory
    		 2.8 6 $0.95 @ 1k
    See All Memory (EPROM, EEPROM, ROM, NV SRAM) (69)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Application Notes
  		• Application Note 27: Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products - DS2502
  		• Application Note 126: 1-Wire Communication Through Software - DS2502
  		• Application Note 148: Guidelines for Reliable Long Line 1-Wire® Networks - DS2502
  		• Application Note 155: 1-Wire® Software Resource Guide Device Description - DS2502
  		• Application Note 177: Programming 1-Wire EPROM and EEPROM Memory Devices Using a PC - DS2502
  		• Application Note 178: Printed Circuit Board Identification Using 1-Wire Products - DS2502
  		• Application Note 186: Creating Global Identifiers Using 1-Wire Devices - DS2502
  		• Application Note 187: 1-Wire Search Algorithm - DS2502, DS2502
  		• Application Note 192: Using the DS2480B Serial 1-Wire Line Driver - DS2502
  		• Application Note 195: TINIm390 Verification Module Chipset Reference Design - DS2502
  		• Application Note 244: Advanced 1-Wire Network Driver - DS2502
  		• Application Note 710: Dial-Up Networking with the DS80C400 Microcontroller - DS2502
  		• Application Note 1097: White Paper 2: Using the 1-Wire® Public Domain Kit - DS2502
  		• Application Note 1100: White Paper 5: Using 1-Wire APIs for Data Sheet Commands - DS2502
  		• Application Note 3170: Finding the Middle Ground: Developing Applications with High-Speed 8-Bit Microcontrollers - DS2502
  		• Application Note 3377: Maxim Wafer-Level Package Assembly Guide - DS2502
  		• Application Note 3438: Serial Digital Data Networks - DS2502
  		• Application Note 3505: Assembling High-Lead (Pb) DS2502 Flip-Chips in a Pb-Free Assembly Flow - DS2502
  		• Application Note 3989: Add Control, Memory, Security, and Mixed-Signal Functions with a Single Contact - DS2502
  		• Application Note 4002: Understanding Flip-Chip and Chip-Scale Package Technologies and Their Applications - DS2502

    Evaluation Kits
  		• DS9090K

    Design Guides
  		• 1-Wire® PRODUCTS (PDF)

    Reliability Reports
  		• Reliability Report: DS2502.pdf

    Software/Models
  		• DS2502K Evaluation Kit Software

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-20 of 20

    DS2502 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS2502X1  
    		FCHIP;2 pin;
    Dwg: 21-0379 (PDF)
    Use pkgcode/variation: BF211-2*
    		-40°C to +85°C See data sheet
    DS2502G+U  
    		SFN;2 pin;
    Dwg: 21-0390 (PDF)
    Use pkgcode/variation: G266+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS2502G+T&R  
    		SFN;2 pin;
    Dwg: 21-0390 (PDF)
    Use pkgcode/variation: G266+1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS2502S  
    		SOIC;8 pin;
    Dwg: 21-0041 (PDF)
    Use pkgcode/variation: S8-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS2502S+  
    		SOIC;8 pin;
    Dwg: 21-0041 (PDF)
    Use pkgcode/variation: S8+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS2502S+T&R  
    		SOIC;8 pin;
    Dwg: 21-0041 (PDF)
    Use pkgcode/variation: S8+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS2502S/T&R  
    		SOIC;8 pin;
    Dwg: 21-0041 (PDF)
    Use pkgcode/variation: S8-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS2502K  
    		SOT-23;3 pin;
    Dwg: 21-0051 (PDF)
    Use pkgcode/variation: U3+5*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS2502R+T&R  
    		SOT-23;3 pin;
    Dwg: 21-0051 (PDF)
    Use pkgcode/variation: U3+5*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS2502R/T&R  
    		SOT23;3 pin;
    Dwg: 21-0051 (PDF)
    Use pkgcode/variation: U3-5*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS2502+T&R  
    		TO92;3 pin;
    Dwg: 21-0250 (PDF)
    Use pkgcode/variation: Q3+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS2502+  
    		TO92;3 pin;
    Dwg: 21-0248 (PDF)
    Use pkgcode/variation: Q3+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS2502  
    		TO92;3 pin;
    Dwg: 21-0248 (PDF)
    Use pkgcode/variation: Q3-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS2502/T&R/SL  
    		TO92;3 pin;
    Dwg: 21-0248 (PDF)
    Use pkgcode/variation: Q3-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS2502/T&R  
    		TO92;3 pin;
    Dwg: 21-0250 (PDF)
    Use pkgcode/variation: Q3-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS2502P+  
    		TSOC;6 pin;
    Dwg: 21-0382 (PDF)
    Use pkgcode/variation: D6+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS2502P-E48/T&R-DALLAS  



    		-40°C to +85°C See data sheet
    DS2502P/T&R  
    		TSOC;6 pin;
    Dwg: 21-0382 (PDF)
    Use pkgcode/variation: D6-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS2502P  
    		TSOC;6 pin;
    Dwg: 21-0382 (PDF)
    Use pkgcode/variation: D6-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS2502P+T&R  
    		TSOC;6 pin;
    Dwg: 21-0382 (PDF)
    Use pkgcode/variation: D6+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

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    2007-07-12
    This page last modified: 2008-11-11




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