Features
● 1024 Bits of EEPROM Memory Partitioned into Four
Pages of 256 Bits
● On-Chip 512-Bit SHA-1 Engine to Compute 160-
Bit Message Authentication Codes (MACs) and to
Generate Secrets
● Dedicated 64-Bit Write-Only Secret with a Feature to
Extend the Secret Size to 320 Bits by Setting a 256-
Bit Page as Both Read and Write Protected
● 5-Byte Challenge Size for Read Authenticated Page
with Optional “Anonymous” Mode
● Write Access Requires Knowledge of the Secret and
the Capability of Computing and Transmitting a 160-
Bit MAC as Authorization
● User-Programmable Page Write Protection for
Page 0, Page 3, or All Four Pages Together
● User-Programmable OTP EPROM Emulation Mode
for Page 1 (“Write to 0”)
● Communicates to Host with a Single Digital Signal at
15.3kbps or 90.9kbps Using 1-Wire Protocol
● Switchpoint Hysteresis and Filtering to Optimize
Performance in the Presence of Noise
● Reads and Writes over 2.8V to 5.25V Voltage
Range from -40°C to +85°C
● 6-Lead TSOC and TDFN or 2-Lead TO-92 Packages
Applications
● Printer Cartridge Configuration and Monitoring
● Medical Sensor Authentication and Calibration
● System Intellectual Property Protection