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DS28E02 Datasheet, PDF (1/21 Pages) Maxim Integrated Products – 1-Wire SHA-1 Authenticated 1Kb EEPROM with 1.8V Operation
219-0008; Rev 1; 3/12
ABRIDGED DATA SHEET
1-Wire SHA-1 Authenticated 1Kb
EEPROM with 1.8V Operation
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
over the single-contact 1-Wire® bus. The communica-
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
Typical Operating Circuit
VCC
µC
RPUP
IO
DS28E02
GND
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
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
DS28E02P+
DS28E02P+T&R
-20°C to +85°C
-20°C to +85°C
6 TSOC
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.
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
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.