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DS28E25Q+T Datasheet

Download or read online Maxim Integrated DS28E25Q+T 1-Wire SHA-256 Secure Authenticator with 4Kb User EEPROM pdf datasheet.



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ABRIDGED DATA SHEET
1-Wire SHA-256 Secure Authenticator
General Description
The DS28E25 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
4Kb 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 DS28E25. Slave-to-host authenti-
cation is used by a host system to securely validate that
an attached or embedded DS28E25 is authentic. Host-
to-slave authentication is used to protect DS28E25 user
memory from being modified by a nonauthentic host. The
SHA-256 message authentication code (MAC), which the
DS28E25 generates, is computed from data in the user
memory, an on-chip secret, a host random challenge,
and the 64-bit ROM ID. The DS28E25 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.maxim-ic.com.
E V A L U A T I O N K I T A V A I L A B L E
DS28E25
with 4Kb 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 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: 3.3V ±10%, -40NC to +85NC
S Low-Power 5µA (typ) Standby
S ±8kV Human Body Model ESD Protection (typ)
S 2-Pin SFN, 6-Pin TDFN, 6-Lead TSOC Packages
Typical Application Circuit
V
CC
R
PUP
IO
µC
www.maxim-ic.com/DS28E25.related
219-0019; Rev 0; 7/12
Features
DS28E25
GND
1

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.maxim-ic.com. ...

Page 2

ABRIDGED DATA SHEET 1-Wire SHA-256 Secure Authenticator ABSOLUTE MAXIMUM RATINGS IO Voltage Range to GND ... -0.5V to 4.0V IO Sink Current ...20mA Operating Temperature Range ... -40NC to 85NC Junction Temperature ...150NC Stresses beyond those listed under Absolute Maximum ...

Page 3

ABRIDGED DATA SHEET 1-Wire SHA-256 Secure Authenticator ELECTRICAL CHARACTERISTICS (continued -40NC to 85NC, unless otherwise noted.) (Note 1) A PARAMETER SYMBOL SHA-256 ENGINE Computation Current I CSHA Computation Time t CSHA Note 1: Limits are 100% production tested ...

Page 4

ABRIDGED DATA SHEET 1-Wire SHA-256 Secure Authenticator BOTTOM VIEW TOP VIEW 1 2 DS28E25 IO GND SFN (6mm x 6mm x 0.9mm) NOTE: THE SFN PACKAGE IS QUALIFIED FOR ELECTRO-MECHANICAL CONTACT APPLICATIONS ONLY, NOT FOR SOLDERING. FOR MORE INFORMATION, REFER ...

Page 5

... DS28E25GT -40°C to 85°C 2 SFN (2.5k pcs) DS28E25P -40°C to 85°C 6 TSOC DS28E25PT -40°C to 85°C 6 TSOC (4k pcs) DS28E25QT -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. DS28E25 with 4Kb User EEPROM www.maxim-ic.com/ Package Information For the latest package outline information and land patterns (footprints www ...

Page 6

... Maxim 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. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated Products, Inc. 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 2012 Maxim Integrated Products © ...

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