DS1961S-F5 1kb Protected EEPROM iButton With SHA-1 Engine

DS1961S-F5 1kb Protected EEPROM iButton With SHA-1 Engine

Place of Origin: China(Mainland)                   Part Number: DS1961S-F5               Brand Name: Dallas / Maxim Integrated
Min. Order Quantity: 100 Pieces                     Port: Guangzhou                                 Payment Terms: T/T, Western Union, Paypal

DS1961S-F5 1kb Protected EEPROM iButton With SHA-1 Engine


The DS1961S 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 rugged iButton. Data is transferred serially through the 1-Wire protocol, which requires only a single data lead and a ground return. The DS1961S 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 transfers the data to its final memory location, provided that the DS1961S receives a matching 160-bit MAC. The computation of the MAC involves the secret and additional data stored in the DS1961S including the device’s identity register. Only a new secret can be loaded without providing a MAC. The SHA-1 engine can also be activated to compute 160-bit MACs when reading a memory page or to compute a new secret, instead of loading it.

Each DS1961S has its own 64-bit ROM registration number that is factory lasered into the chip to provide a guaranteed unique identity for absolute traceability. The durable stainless-steel 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 DS1961S to be easily used by human operators. Accessories permit the DS1961S to be mounted on almost any surface including plastic key fobs and photo-ID badges.  .


Key Features

  • 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
  • Write Access Requires Knowledge of the Secret and the Capability of Computing and Transmitting a 160-Bit MAC (Message Authentication Code) as Authorization
  • Secret and Data Memory can be WriteProtected (All or Page 0 Only) or put in EPROM-Emulation Mode (“Write to 0”, Page 1)
  • On-Chip, 512-Bit SHA-1 Engine to Compute 160-Bit MACs and Generate Secrets
  • Reads and Writes Over a Wide 2.8V to 5.25V Voltage Range from -40°C to +85°C

Common iButton Features

  • Unique Factory-Lasered 64-Bit Registration Number Ensures Error-Free Device Selection and Absolute Traceability Because No Two Parts are Alike
  • Built-In Multidrop Controller for 1-Wire Net
  • Digital Identification by Momentary Contact
  • Data Can Be Accessed While Affixed to Object
  • Economically Communicates to Bus Master with a Single Digital Signal at 16.3kbps
  • 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


  • Driver Identification for GPS Tracking Solutions
  • Access Control
  • Work-In-Progress Tracking
  • Tool Management
  • Inventory Control

The DS1961S-F5 can be found on its data sheet here: DS1961S-F5 DataSheet.

*Note: iButton and 1-Wire are registered trademarks of Maxim.

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