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DS28EL25Q+T Datasheet

Download or read online Maxim Integrated DS28EL25Q+T DeepCover Secure Authenticator with 1-Wire SHA-256 with 4Kb User EEPROM pdf datasheet.



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with 1-Wire SHA-256 with 4Kb User EEPROM
General Description
DeepCoverK embedded security solutions cloak sensi-
tive data under multiple layers of advanced physical secu-
rity to provide the industry’s most secure key storage pos-
sible. The Deepcover Secure Authenticator (DS28EL25)
combines crypto-strong, bidirectional, secure challenge-
and-response authentication functionality with an imple-
mentation based on the FIPS 180-3-specified Secure
Hash Algorithm (SHA-256). A 4Kb user-programmable
EEPROM array provides nonvolatile storage of applica-
tion data and additional protected memory holds a read-
protected secret for SHA-256 operations and settings for
user memory control. Each device has its own guaranteed
unique 64-bit ROM identification number (ROM ID) that is
factory programmed into the chip. This unique ROM ID is
used as a fundamental input parameter for cryptographic
operations and also serves as an electronic serial num-
ber within the application. A bidirectional security model
enables two-way authentication between a host system
and slave-embedded DS28EL25. Slave-to-host authenti-
cation is used by a host system to securely validate that
an attached or embedded DS28EL25 is authentic. Host-
to-slave authentication is used to protect DS28EL25 user
memory from being modified by a nonauthentic host. The
SHA-256 message authentication code (MAC), which the
DS28EL25 generates, is computed from data in the user
memory, an on-chip secret, a host random challenge,
and the 64-bit ROM ID. The DS28EL25 communicates
over the single-contact 1-Wire
bus at overdrive speed.
M
The communication follows the 1-Wire protocol with the
ROM ID acting as node address in the case of a multiple-
device 1-Wire network.
Applications
Authentication of Network-Attached Appliances
Printer Cartridge ID/Authentication
Reference Design License Management
System Intellectual Property Protection
Sensor/Accessory Authentication and Calibration
Secure Feature Setting for Configurable Systems
Key Generation and Exchange for Cryptographic
Systems
For related parts and recommended products to use with this part, refer to:
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
ABRIDGED DATA SHEET
DeepCover Secure Authenticator
S Symmetric Key-Based Bidirectional Secure
Authentication Model Based on SHA-256
S Dedicated Hardware-Accelerated SHA Engine for
Generating SHA-256 MACs
S Strong Authentication with a High Bit Count, User-
Programmable Secret, and Input Challenge
S 4096 Bits of User EEPROM Partitioned Into 16
Pages of 256 Bits
S User-Programmable and Irreversible EEPROM
Protection Modes Including Authentication, Write
and Read Protect, and OTP/EPROM Emulation
S Unique, Factory-Programmed 64-Bit Identification
Number
S Single-Contact 1-Wire Interface Communicates
with Host at Up to 76.9kbps
S Operating Range: 1.8V ±5%, -40°C to +85°C
S Low-Power 5µA (typ) Standby
S ±8kV Human Body Model ESD Protection (typ)
S 6-Pin TDFN Package
Typical Application Circuit
1.8V
2
(I
C PORT)
µC
Ordering Information
1-Wire is a registered trademark and DeepCover is a trademark
of Maxim Integrated Products, Inc.
www.maximintegrated.com/DS28EL25.related
EVALUATION KIT AVAILABLE
DS28EL25
Features
R
P
R
= 820Ω
P
V
CC
2
MAXIMUM I
C BUS CAPACITANCE 400pF
SDA
SCL
DS24L65
1-Wire LINE
SLPZ
IO
DS28EL25
appears at end of data sheet.
219-0022; Rev 0; 12/12

Summary of Contents

Page 1

... Key Generation and Exchange for Cryptographic Systems For related parts and recommended products to use with this part, refer to: For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com. ABRIDGED DATA SHEET DeepCover Secure Authenticator S Symmetric Key-Based Bidirectional Secure ...

Page 2

... PRD Segment or Page Protection Programming Time for the Secret t PRS Write/Erase Cycling Endurance N Data Retention t DR Maxim Integrated DeepCover Secure Authenticator Storage Temperature Range ... -55NC to 125NC Lead Temperature (soldering, 10s) ...300NC Soldering Temperature (reflow) ...260NC CONDITIONS (Note 1.8V ±5% (Note 3) PUP ...

Page 3

... Note 24: Guaranteed by 100% production test at elevated temperature for a shorter time; equivalence of this production test to the data sheet limit at operating temperature range is established by reliability testing. Note 25: EEPROM writes can become nonfunctional after the data retention time is exceeded. Long-term storage at elevated tem- peratures is not recommended. Maxim Integrated DeepCover Secure Authenticator CONDITIONS Refer to the full data sheet. ...

Page 4

... Note 26: Refer to the full data sheet. Typical Operating Characteristics (V 1.71V 0.3V) PUP IL POWER-UP TIME 180 160 140 120 100 -40 - TEMPERATURE (°C) Maxim Integrated DeepCover Secure Authenticator 60 80 PIN NAME 3 GND N. EP DS28EL25 Pin Configuration TOP VIEW DS28EL25 N. N.C. ...

Page 5

... To request the full data sheet and click on Request Full Data Sheet. Ordering Information PART TEMP RANGE PIN-PACKAGE DS28EL25QT -40°C to 85°C 6 TDFN-EP (2.5k pcs) Denotes a lead(Pb)-free/RoHS-compliant package Tape and reel. EP Exposed pad. Maxim Integrated DeepCover Secure Authenticator www ...

Page 6

... Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed ...

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