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DS28E22Q Datasheet

Download or read online Maxim Integrated DS28E22Q 1-Wire SHA-256 Secure Authenticator with 2Kb User EEPROM pdf datasheet.



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1-Wire SHA-256 Secure Authenticator
General Description
The DS28E22 combines crypto-strong, bidirectional,
secure challenge-and-response authentication func-
tionality with an implementation based on the FIPS
180-3-specified Secure Hash Algorithm (SHA-256). A
2Kb user-programmable EEPROM array provides non-
volatile storage of application data and additional pro-
tected 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 pro-
grammed into the chip. This unique ROM ID is used as
a fundamental input parameter for cryptographic opera-
tions and also serves as an electronic serial number
within the application. A bidirectional security model
enables two-way authentication between a host system
and slave-embedded DS28E22. Slave-to-host authenti-
cation is used by a host system to securely validate that
an attached or embedded DS28E22 is authentic. Host-
to-slave authentication is used to protect DS28E22 user
memory from being modified by a nonauthentic host. The
SHA-256 message authentication code (MAC), which the
DS28E22 generates, is computed from data in the user
memory, an on-chip secret, a host random challenge,
and the 64-bit ROM ID. The DS28E22 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
Ordering Information
appears at end of data sheet.
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
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’s website at www.maximintegrated.com.
ABRIDGED DATA SHEET
EVALUATION KIT AVAILABLE
with 2Kb User EEPROM
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 2048 Bits of User EEPROM Partitioned Into 8
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: 3.3V ±10%, -40NC to +85NC
S Low-Power 5µA (typ) Standby
S ±8kV Human Body Model ESD Protection (typ)
S 6-Pin TDFN, 6-Lead TSOC Packages
Typical Application Circuit
3.3V
R
P
V
CC
SDA
2
(I
C PORT)
SCL
DS2465
µC
SLPZ
IO
www.maximintegrated.com/DS28E22.related
DS28E22
Features
R
= 1.1kΩ
P
2
MAXIMUM I
C BUS CAPACITANCE 320pF
1-Wire LINE
DS28E22
219-0020; Rev 0; 9/12

Summary of Contents

Page 1

... Systems Ordering Information appears at end of data sheet. 1-Wire is a registered trademark of Maxim Integrated Products, Inc. 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 Maxims website at www.maximintegrated.com. ...

Page 2

... PROG Programming Time for a 32-Bit t PROG Segment Write/Erase Cycling Endurance N Data Retention t DR Maxim Integrated with 2Kb User EEPROM Storage Temperature Range ... -55NC to 125NC Lead Temperature (soldering, 10s) ...300NC Soldering Temperature (reflow) ...260NC CONDITIONS (Note 3.3V Q 10% (Note 3) PUP (Notes 4, 5) ...

Page 3

... Note 24: EEPROM writes can become nonfunctional after the data retention time is exceeded. Long-term storage at elevated tem- peratures is not recommended. Note 25: Refer to the full data sheet. Maxim Integrated with 2Kb User EEPROM CONDITIONS Refer to the full data sheet. ...

Page 4

... N.C. Not Connected Exposed Pad (TDFN only). Solder evenly to the boards ground plane for proper EP operation. Refer to Application Note 3273: Exposed Pads: A Brief Introduction for additional information. Maxim Integrated with 2Kb User EEPROM TOP VIEW 6 N. N.C. ...

Page 5

... PART TEMP RANGE PIN-PACKAGE DS28E22P -40°C to 85°C 6 TSOC DS28E22PT -40°C to 85°C 6 TSOC (4k pcs) DS28E22QT -40°C to 85°C 6 TDFN-EP (2.5k pcs) Denotes a lead(Pb)-free/RoHS-compliant package Tape and reel. Future productcontact factory for availability. EP Exposed pad. Maxim Integrated DS28E22 with 2Kb User EEPROM www ...

Page 6

... Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 2012 Maxim Integrated © with 2Kb User EEPROM DESCRIPTION The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc. DS28E22 Revision History PAGES CHANGED ...

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