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DS2432
1Kb Protected 1-Wire EEPROM with SHA-1 Engine


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Status
Part Number Status
DS2432 Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Data Sheet
ABRIDGED DATA SHEET (PDF, 164kB)
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Description
ABRIDGED DATA SHEET (PDF, 164kB)
Download this datasheet in PDF formatDownload Request Full Data Sheet
The DS2432 combines 1024 bits of EEPROM, a 64-bit secret, an 8-byte register/control page with up to five user read/write bytes, a 512-bit SHA-1 engine, and a fully-featured 1-Wire interface in a single chip. Each DS2432 has its own 64-bit ROM registration number that is factory lasered into the chip to provide a guaranteed unique identity for absolute traceability. Data is transferred serially via the 1-Wire protocol, which requires only a single data lead and a ground return. The DS2432 has an additional memory area called the scratchpad that acts as a buffer when writing to the main memory, the register page or when installing a new secret. Data is first written to the scratchpad from where it can be read back. After the data has been verified, a copy scratchpad command will transfer the data to its final memory location, provided that the DS2432 receives a matching 160-Bit MAC. The computation of the MAC involves the secret and additional data stored in the DS2432 including the device's registration number. Only a new secret can be loaded without providing a MAC. The SHA-1 engine can also be activated to compute 160-bit message authentication codes (MAC) when reading a memory page or to compute a new secret, instead of loading it. Applications of the DS2432 include intellectual property security, after-market management of consumables, and tamper-proof data carriers.

An evaluation kit is available:  DS9090K  

Key Features   Applications/Uses
  • 1128 Bits of 5V EEPROM Memory Partitioned Into Four Pages of 256 Bits, a 64-Bit Write-Only Secret, and Up to Five General-Purpose Read/Write Registers
  • On-Chip 512-Bit ISO/IEC 10118-3 SHA-1 Engine to Compute 160-Bit Message Authentication Codes (MACs) and to Generate Secrets
  • Write Access Requires Knowledge of the Secret and the Capability of Computing and Transmitting a 160-Bit MAC as Authorization
  • Secret and Data Memory Can Be Write Protected (All or Page 0 Only) or Put in EPROM-Emulation Mode ("Write to 0", Page 1)
  • Unique, Factory-Lasered and Tested 64-Bit Registration Number Assures Absolute Traceability Because No Two Parts Are Alike
  • Built-In Multidrop Controller Ensures Compatibility with Other 1-Wire® Net Products
  • Reduces Control, Address, Data, and Power to a Single Data Pin
  • Directly Connects to a Single Port Pin of a Microprocessor and Communicates at Up to 16.3kbps
  • Overdrive Mode Boosts Communication Speed to 142kbps
  • Low-Cost 6-Lead TSOC Surface-Mount Package or Solder-Bumped UCSP™ Package
  • Reads and Writes Over a Wide Voltage Range of 2.8V to 5.25V from -40°C to +85°C

 
  • Device Authentication
  • IEEE 1451.4 Sensor TEDS
  • Ink/Toner Cartridges
  • Medical Sensors
  • PCB Identification
  • Self-Configuration of Central Office Switches, Wireless Base Stations, PBXs, or other Modular-Based Rack Systems

    Key Specifications:  Memory (EPROM, EEPROM, ROM, NV SRAM)
    Part Number Memory Type Memory Size Bus Type Real Time Clock DIP w/Int. Batt. Pwr. Cap Pckg. Battery Monitor With GPIO Features VSUPPLY
    (V)
    VSUPPLY
    (V)
    min max
    DS2432  EEPROM 1K x 1 1-Wire No No No No No Secure Hash Standard 2.8 5.5
    See All Memory (EPROM, EEPROM, ROM, NV SRAM) (55)

    Key Specifications:  Secure Memory Devices
    Part Number Memory Type Memory Size Bus Type Security Features VCC
    (V)
    Oper. Temp.
    (°C)
    Package/Pins Smallest Available Pckg.
    (mm2)
    max w/pins
    DS2432  EEPROM 1K x 1 1-Wire Secure Hash Standard 5.5 -40 to +85
    TSOC/6
    WLCSP/8
    5
    See All Secure Memory Devices (4)

    Application Notes
  • Application Note 27: Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products - DS2432
  • Application Note 74: Reading and Writing 1-Wire® Devices Through Serial Interfaces - DS2432
  • Application Note 126: 1-Wire® Communication Through Software - DS2432
  • Application Note 148: Guidelines for Reliable Long Line 1-Wire® Networks - DS2432
  • Application Note 151: Maxim Digital Monetary Certificates - DS2432
  • Application Note 154: Passwords in SHA Authentication - DS2432
  • Application Note 155: 1-Wire® Software Resource Guide Device Description - DS2432
  • Application Note 178: Printed Circuit Board Identification Using 1-Wire® Products - DS2432
  • Application Note 187: 1-Wire Search Algorithm - DS2432
  • Application Note 190: Challenge and Response with 1-Wire® SHA Devices - DS2432
  • Application Note 192: Using the DS2480B Serial 1-Wire Line Driver - DS2432
  • Application Note 244: Advanced 1-Wire Network Driver - DS2432
  • Application Note 1097: White Paper 2: Using the 1-Wire® Public Domain Kit - DS2432
  • Application Note 1098: White Paper 3: Why are 1-Wire SHA-1 Devices Secure? - DS2432
  • Application Note 1099: White Paper 4: Glossary of 1-Wire SHA-1 Terms - DS2432
  • Application Note 1100: White Paper 5: Using 1-Wire APIs for Data Sheet Commands - DS2432
  • Application Note 1201: White Paper 8: 1-Wire® SHA-1 Overview - DS2432
  • Application Note 1820: White Paper 1: SHA Devices Used in Small Cash Systems - DS2432
  • Application Note 3377: Maxim Wafer-Level Package Assembly Guide - DS2432
  • Application Note 3438: Serial Digital Data Networks - DS2432
  • Application Note 3522: White Paper 9: Are SHA-1 Devices Still Secure Enough? - DS2432
  • Application Note 3675: Protecting the R&D Investment—Two-Way Authentication and Secure Soft-Feature Settings - DS2432
  • Application Note 3826: Xilinx® FPGA IFF Copy Protection with 1-Wire SHA-1 Secure Memories - ds2432
  • Application Note 3989: Add Control, Memory, Security, and Mixed-Signal Functions with a Single Contact - DS2432
  • Application Note 4002: Understanding Flip-Chip and Chip-Scale Package Technologies and Their Applications - DS2432
  • Application Note 4132: Attachment Methods for the Electro-Mechanical SFN Package - DS2432
  • Application Note 4255: How to Power the Extended Features of 1-Wire® Devices - DS2432

    Evaluation Kits
  • DS9090K

    Design Guides
  • 1-Wire® Products (PDF)

    Reliability Reports
  • Reliability Report: DS2432.pdf

    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: 1-9 of 9

    DS2432 Free
    Sample
    Buy Status Recommended Replacement
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    DS2432P     N/A No Longer Available DS2432P+


    Land Pattern: Not Available

    -40°C to +85°C See data sheet
    DS2432P/T&R     N/A No Longer Available DS2432P+


    Land Pattern: Not Available

    -40°C to +85°C See data sheet
    DS2432P+  
    Active
    TSOC;6 pin;18 mm²
    Outline Drawing: 21-0382 (PDF)
    Land Pattern: 90-0321 (PDF)
    Use pkgcode/variation: D6+1*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS2432P+T&R    
    Active
    TSOC;6 pin;18 mm²
    Outline Drawing: 21-0382 (PDF)
    Land Pattern: 90-0321 (PDF)
    Use pkgcode/variation: D6+1*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS2432X     N/A No Longer Available


    Land Pattern: Not Available

    -40°C to +85°C See data sheet
    DS2432X-S     N/A No Longer Available


    Land Pattern: Not Available

    -40°C to +85°C See data sheet
    DS2432X+U  
    Active
    WLCSP;8 pin;5 mm²
    Outline Drawing: 21-0373 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: BR823+1*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS2432X-S+    
    Active
    WLCSP;8 pin;5 mm²
    Outline Drawing: 21-0373 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: BR823+1*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS2432X+     N/A No Longer Available DS2432X-S+
    WLCSP;8 pin;5 mm²
    Outline Drawing: 21-0373 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: BR823+1*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  • Sensor Calibration

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    2007-04-10
    This page last modified: 2009-06-12


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