Abridged Data Sheet
DS2460
SHA-1 Coprocessor with EEPROM
www.maxim-ic.com
GENERAL DESCRIPTION
FEATURES
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.
Dedicated Hardware-Accelerated SHA Engine
for Generating SHA-1 MACs
112 Bytes User EEPROM for Storing End
Equipment Property Data
I²C Host Interface, Supports 100kHz and 400kHz
Communication Speeds
Three Address Inputs for I²C Address
Assignment
Single-Byte to 8-Byte EEPROM Write
Sequences
64-Bit Unique Registration Number
EEPROM Endurance: 200k Cycles per 8-Byte
Block at 25°C
10ms max EEPROM Write Cycle
Wide Operating Range: 2.7V to 5.5V,
-40°C to +85°C
APPLICATIONS
License Management
Secure Feature Control
System Authentication
Clone Prevention
Door Locks
±4kV IEC 1000-4-2 ESD Protection Level on All
Pins
8-Pin SO (150 mils) Package
ORDERING INFORMATION
PART
DS2460S
Utility Meters
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO (150 mils)
8 SO (150 mils)
8 SO (150 mils)
8 SO (150 mils)
DS2460S/T&R
DS2460S+
TYPICAL OPERATING CIRCUIT
DS2460S+T&R
VCC
+ Indicates lead-free compliance.
RP
RP
VCC
Request full data sheet at:
www.maxim-ic.com/fullds/DS2460
SDA
SCL
VCC
µC
SDA
SCL
AD0
AD1
AD2
PIN CONFIGURATION
GND
AD0
AD1
AD2
GND
VCC
1
2
3
4
8
7
6
5
GND
SCL
SDA
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.
1 of 8
REV: 080807