General Description

The DS28E02 combines 1024 bits of EEPROM with

challenge-and-response authentication security imple-

mented with the FIPS 180-3 Secure Hash Algorithm

(SHA-1). The 1024-bit EEPROM array is configured as

four pages of 256 bits with a 64-bit scratchpad to per-

form write operations. All memory pages can be write

protected, and one page can be put in EPROM-emula-

tion mode, where bits can only be changed from a 1 to

a 0 state. Each DS28E02 has its own guaranteed

unique 64-bit ROM registration number that is factory

installed into the chip. The DS28E02 communicates

tion follows the standard 1-Wire protocol with the regis-

tration number acting as the node address in the case

of a multidevice 1-Wire network.

Applications

Reference Design License Management

System Intellectual Property Protection

Sensor/Accessory Authentication and Calibration

Medical Consumable Authentication

Printer Cartridge Configuration and Monitoring

Features

o 1024 Bits of EEPROM Memory Partitioned Into

Four Pages of 256 Bits

o On-Chip 512-Bit SHA-1 Engine to Compute 160-

Bit Message Authentication Codes (MACs) and to

Generate Secrets

o Write Access Requires Knowledge of the Secret

and the Capability of Computing and Transmitting

a 160-Bit MAC as Authorization

o User-Programmable Page Write Protection for

Page 0, Page 3, or All Four Pages Together

o User-Programmable OTP EPROM Emulation Mode

for Page 1 (“Write to 0”)

o Communicates to Host with a Single Digital

Signal at 12.5kbps or 35.7kbps Using 1-Wire

Protocol

o Switchpoint Hysteresis and Filtering to Optimize

Communication Performance in the Presence of

Noise

o Reads and Writes Over 1.75V to 3.65V Voltage

Range from -20°C to +85°C

o 6-Lead TSOC and TDFN Packages

1-Wire SHA-1 Authenticated 1Kb

EEPROM with 1.8V Operation

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

219-0008; Rev 1; 3/12

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

ABRIDGED DATA SHEET

PART

TEMP RANGE

PIN-PACKAGE

DS28E02P+

-20

°C to +85°C

6 TSOC

DS28E02P+T&R

-20

°C to +85°C

6 TSOC

DS28E02Q+T&R

-20

°C to +85°C

6 TDFN-EP*

(2.5k pcs)

+

Denotes a lead(Pb)-free/RoHS-compliant package.

T&R = Tape and reel.

*

EP = Exposed pad.

IO

µC

GND

DS28E02

Typical Operating Circuit

1-Wire is a registered trademark of Maxim Integrated Products, Inc.