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