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PDF DS28E25 Data sheet ( Hoja de datos )
| Número de pieza | DS28E25 | |
| Descripción | DeepCover Secure Authenticator | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de DS28E25 (archivo pdf) en la parte inferior de esta página. Total 5 Páginas | ||
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ABRIDGED DATA SHEET
EVALUATION KIT AVAILABLE
DS28E25
DeepCover Secure Authenticator with
1-Wire SHA-256 and 4Kb User EEPROM
General Description
DeepCover™ embedded security solutions cloak sensi-
tive data under multiple layers of advanced physical
security to provide the most secure key storage possible.
The DeepCover Secure Authenticator (DS28E25) com-
bines 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 guar-
anteed 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 elec-
tronic serial number within the application. A bidirectional
security model enables two-way authentication between
a host system and slave-embedded DS28E25. Slave-to-
host authentication 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 non-
authentic 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-WireM bus at
overdrive speed. 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
Features
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, 2-Pin TO-92, 6-Pin TDFN, and 6-Pin
TSOC Packages
Typical Application Circuit
3V
(I2C PORT)
µC
RP
SDA
SCL
VCC
DS2465
RP = 1.1kΩ
MAXIMUM I2C BUS CAPACITANCE 320pF
SLPZ IO 1-Wire LINE
DS28E25
Ordering Information appears at end of data sheet.
DeepCover is a trademark and 1-Wire is a registered trademark of Maxim Integrated Products, Inc.
For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/DS28E25.related
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.
219-0019; Rev 3; 12/12
1 page  
ABRIDGED DATA SHEET
DS28E25
DeepCover Secure Authenticator with
1-Wire SHA-256 and 4Kb User EEPROM
Note to readers: This document is an abridged version of the full data sheet. Additional device information is available
only in the full version of the data sheet. To request the full data sheet, go to www.maximintegrated.com/DS28E25
and click on Request Full Data Sheet.
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
DS28E25G+T -40°C to +85°C 2 SFN (2.5k pcs)
DS28E25+
-40°C to +85°C 2 TO-92
DS28E25P+
-40°C to +85°C 6 TSOC
DS28E25P+T -40°C to +85°C 6 TSOC (4k pcs)
DS28E25Q+T -40°C to +85°C 6 TDFN-EP* (2.5k pcs)
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
Package Information
For the latest package outline information and land patterns (foot-
prints), go to www.maximintegrated.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but the
drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
2 SFN
2 TO-92
6 TSOC
6 TDFN-EP
PACKAGE
CODE
G266N+1
Q2+1
D6+1
T633+2
OUTLINE
NO.
21-0390
21-0249
21-0382
21-0137
LAND
PATTERN NO.
—
—
90-0321
90-0058
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. 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
43
© 2012 Maxim Integrated Products, Inc.
Maxim Integrated and the Maxim logo are trademarks of Maxim Integrated Products, Inc.
5 Page | ||
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| PDF Descargar | [ Datasheet DS28E25.PDF ] | |
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