DS1961S Datasheet, PDF (1/36 Pages) Dallas Semiconductor – 1kb Protected EEPROM iButton With SHA-1 Engine

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DS1961S
1kb Protected EEPROM iButton
With SHA-1 Engine
SPECIAL 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 Write-
Protected (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
§ Communicates to Host with a Single Digital
Signal at 14.1kbps using 1-Wire^® Protocol
§ On-Chip, 16-Bit Cyclic Redundancy Check
(CRC) Generator for Safeguarding Data
Transfers
§ Overdrive Mode Boosts Communication
Speed to 125kbps
§ Operating Temperature Range from -40°C to
+85°C
§ Minimum 10 Years of Data Retention at
+85°C
§ 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, Groups A, B, C,
and D Locations (Application Pending)
F5 MicroCan
5.89
0.36
0.51
© 1993
YYWW REGISTERED RR
xx
33
000000FBD8B3
16.25
17.35
IO
GND
F3 MicroCan
COMMON iButton FEATURES
§ 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 1-Wire Net
§ Digital Identification and Information by
Momentary Contact
§ Chip-Based Data Carrier Compactly Stores
Information
§ Data can be Accessed While Affixed to
Object
0.36
3.10
0.51
© 1993
YYWW REGISTERED RR
xx
33
000000FBC52B
16.25
17.35
IO
GND
All dimensions are shown in millimeters.
iButton, 1-Wire, and MicroCan are registered trademarks of
Dallas Semiconductor.
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