DS2460 Datasheet, PDF (1/8 Pages) Dallas Semiconductor – SHA-1 Coprocessor with EEPROM

Abridged Data Sheet
DS2460
SHA-1 Coprocessor with EEPROM
www.maxim-ic.com
GENERAL DESCRIPTION
The DS2460 SHA-1 Coprocessor with EEPROM is a
hardware implementation of the ISO/IEC 10118-3
Secure Hash Algorithm (SHA-1), eliminating the need
to develop software to perform the complex SHA
computation required for authenticating SHA devices
and for performing the validation of digitally signed
service data. The DS2460 communicates with a
microcontroller through the popular I²C interface.
Applications include hosts of access control and
electronic payment systems for token authentication
and service data validation as well as generation of
one-time-use encryption keys for short message
encryption and decryption for messages not exceed-
ing the length of a SHA-1 result, which is 20 bytes.
APPLICATIONS
License Management
Secure Feature Control
System Authentication
Clone Prevention
Door Locks
Utility Meters
TYPICAL OPERATING CIRCUIT
VCC
RP
RP
VCC
SDA
SCL
µC
GND
VCC
SDA AD0
SCL
AD1
AD2
GND
FEATURES
ƒ Dedicated Hardware-Accelerated SHA Engine
for Generating SHA-1 MACs
ƒ 112 Bytes User EEPROM for Storing End
Equipment Property Data
ƒ I²C Host Interface, Supports 100kHz and 400kHz
Communication Speeds
ƒ Three Address Inputs for I²C Address
Assignment
ƒ Single-Byte to 8-Byte EEPROM Write
Sequences
ƒ 64-Bit Unique Registration Number
ƒ EEPROM Endurance: 200k Cycles per 8-Byte
Block at 25°C
ƒ 10ms max EEPROM Write Cycle
ƒ Wide Operating Range: 2.7V to 5.5V,
-40°C to +85°C
ƒ ±4kV IEC 1000-4-2 ESD Protection Level on All
Pins
ƒ 8-Pin SO (150 mils) Package
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
DS2460S
-40°C to +85°C 8 SO (150 mils)
DS2460S/T&R
-40°C to +85°C 8 SO (150 mils)
DS2460S+
-40°C to +85°C 8 SO (150 mils)
DS2460S+T&R -40°C to +85°C 8 SO (150 mils)
+ Indicates lead-free compliance.
Request full data sheet at:
www.maxim-ic.com/fullds/DS2460
PIN CONFIGURATION
AD0
1
AD1
2
AD2
3
GND
4
8
VCC
7
SCL
6
SDA
5
N.C.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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REV: 080807