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DS1992, DS1993
1Kb/4Kb Memory iButton®


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Data Sheet
FULL DATA SHEET (PDF, 348kB)
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Description
The DS1992/DS1993 memory iButtons (hereafter referred to as DS199_) are rugged read/write data carriers that act as a localized database, easily accessible with minimal hardware. The nonvolatile memory and optional timekeeping capability offer a simple solution to storing and retrieving vital information pertaining to the object to which the iButton is attached. Data is transferred serially through the 1-Wire® protocol that requires only a single data lead and a ground return.

The scratchpad is an additional page that acts as a buffer when writing to memory. Data is first written to the scratchpad where it can be read back. After the data has been verified, a copy scratchpad command transfers the data to memory. This process ensures data integrity when modifying the memory. A 48-bit serial number is factory lasered into each DS199_ to provide a guaranteed unique identity that allows for absolute traceability. The durable MicroCan® package is highly resistant to environmental hazards such as dirt, moisture, and shock. Its compact coin-shaped profile is self-aligning with mating receptacles, allowing the DS199_ to be easily used by human operators. Accessories permit the DS199_ to be mounted on almost any surface including plastic key fobs, photo-ID badges, and PC boards. Applications include access control, work-in-progress tracking, electronic travelers, storage of calibration constants, and debit tokens.

Key Features   Applications/Uses
  • 4096 bits of Read/Write Nonvolatile Memory (DS1993)
  • 1024 bits of Read/Write Nonvolatile Memory (DS1992)
  • 256-bit Scratchpad Ensures Integrity of Data Transfer
  • Memory Partitioned into 256-bit Pages for Packetizing Data
  • Data Integrity Assured with Strict Read/Write Protocols
  • Operating Temperature Range from -40°C to +70°C
  • Over 10 years of data retention
  • 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
  • Multidrop Controller for MicroLAN
  • Digital Identification and Information by Momentary Contact
  • Chip-Based Data Carrier Compactly Stores Information
  • Data Can be Accessed While Affixed to Object
  • Economically Communicates to Bus Master with a Single Digital Signal at 16.3kbps
  • Standard 16mm Diameter and 1-Wire Protocol Ensure Compatibility with iButton Family
  • Button Shape is Self-Aligning with Cup-Shaped Probes
  • Durable Stainless Steel Case Engraved with Registration Number Withstands Harsh Environments
  • Easily Affixed with Self-Stick Adhesive Backing, Latched by its Flange, or Locked with a Ring Pressed onto its Rim
  • Presence Detector Acknowledges When Reader First Applies Voltage
  • Meets UL#913 (4th Edit.); Intrinsically Safe Apparatus, Approved under Entity Concept for use in Class I, Division 1, Group A, B, C, and D Locations

 
  • Debit Tokens
  • Electronic Travelers
  • Storage of Calibration Constants
  • Work-in-Progress Tracking

    Key Specifications:   iButton Products
    Part Number Overview Memory Type Memory Size UniqueWare Real-Time Clock RoHS Available Price**
    DS1992 
    iButton Memory
    NV SRAM 1K bits No No Yes $3.73 @ 1k
    DS1993  4Kbits $4.29 @ 1k
    See All iButton Products (25)
    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.

    Diagram

    Application Notes
  • Application Note 27: Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products - DS1992, DS1993
  • Application Note 74: Reading and Writing iButtons via Serial Interfaces - DS1992, DS1993
  • Application Note 114: 1-Wire File Structure - DS1993, DS1992
  • Application Note 126: 1-Wire Communication Through Software - DS1992, DS1993
  • Application Note 148: Guidelines for Reliable Long Line 1-Wire® Networks - DS1992, DS1993
  • Application Note 155: 1-Wire® Software Resource Guide Device Description - DS1992, DS1993
  • Application Note 159: Software Methods to Achieve Robust 1-Wire® Communication in iButton® Applications - DS1992, DS1993
  • Application Note 187: 1-Wire Search Algorithm - DS1992, DS1993
  • Application Note 192: Using the DS2480B Serial 1-Wire Line Driver - DS1992, DS1993
  • Application Note 244: Advanced 1-Wire Network Driver - DS1993, DS1992
  • Application Note 937: Book of iButton Standards - DS1992, DS1993
  • Application Note 1097: White Paper 2: Using the 1-Wire® Public Domain Kit - DS1992, DS1993
  • Application Note 1100: White Paper 5: Using 1-Wire APIs for Data Sheet Commands - DS1992, DS1993
  • Application Note 3808: What Is an iButton? - DS1993, DS1992

    Evaluation Kits
    none

    Reliability Reports
  • Reliability Report: DS1992.pdf
  • Request Reliability Report for:

    Software/Models
    none

    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: 1-3 of 3

    DS1992 Notes Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    DS1992L-F5+  
    CAN;2 pin;
    Dwg: 56-G0CAN-F50
    Use pkgcode/variation: IB+5BW*
    0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1993 Notes Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    DS1993L-F5   F5 MicroCan
    CAN;2 pin;
    Dwg: 56-G0CAN-F50
    Use pkgcode/variation: IB+5BW*
    0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1993L-F5+  
    CAN;2 pin;
    Dwg: 56-G0CAN-F50
    Use pkgcode/variation: IB+5BW*
    0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis

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    2008-07-23
    This page last modified: 2008-07-23



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