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DS2460ST Datasheet

Download or read online Maxim Integrated DS2460ST SHA-1 Coprocessor with EEPROMAbridged Data Sheet pdf datasheet.



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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
V
CC
R
P
V
CC
SDA
SCL
µC
GND
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.
Abridged Data Sheet
SHA-1 Coprocessor with EEPROM
FEATURES
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
±4kV IEC 1000-4-2 ESD Protection Level on All
Pins
8-Pin SO (150 mils) Package
ORDERING INFORMATION
DS2460S
DS2460S/T&R
DS2460S+
DS2460S+T&R
+Denotes a lead(Pb)-free/RoHS-compliant package.
R
P
Request full data sheet at:
www.maxim-ic.com/fullds/DS2460
V
CC
SDA
AD0
PIN CONFIGURATION
SCL
AD1
AD2
GND
1 of 9
DS2460
PART
TEMP RANGE
-40°C to +85°C
8 SO (150 mils)
-40°C to +85°C
8 SO (150 mils)
-40°C to +85°C
8 SO (150 mils)
-40°C to +85°C
8 SO (150 mils)
AD0
V
1
8
CC
AD1
SCL
2
7
AD2
SDA
3
6
GND
N.C.
4
5
PIN-PACKAGE

Summary of Contents

Page 1

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 ...

Page 2

ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground Maximum Current Into Any Pin Operating Temperature Range Junction Temperature Storage Temperature Range Lead Temperature (soldering 10s) Soldering Temperature (reflow) Stresses beyond those listed under Absolute Maximum Ratings may ...

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PARAMETER Setup Time for a Repeated START Condition Data Hold Time Data Setup Time Setup Time for STOP Condition Bus Free Time Between a STOP and START Condition Capacitive Load for Each Bus Line Note 1: Specification at -40°C is ...

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Figure 1. Block Diagram SCL SDA ADx DETAILED REGISTER DESCRIPTION For this section (including Figure 3) please refer to the full version of the data sheet. DEVICE OPERATION The typical use of the DS2460 in an application involves writing, reading, ...

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Slave Address The slave address to which the DS2460 responds is shown in Figure 5. The logic states at the address pins AD0, AD1 and AD2 determine the value of the address bits A0, A2, and A4. The address pins ...

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Repeated START Condition Repeated starts are commonly used for read accesses to select a specific data source or address to read from. The master can use a repeated START condition at the end of a data transfer to immediately initiate ...

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Read and Write This section discusses the read and write behavior of the various registers and the EEPROM. Please refer to the full data sheet for details. SHA-1 Engine Control This section describes the users view of the SHA-1 engine ...

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Since a 885 pullup resistor, as would be required to meet the rise time specification at 400pF bus capacitance, is lower than R at 5.5V, a different approach is necessary. The "Max. Load" line in Figure 11 is generated by ...

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... © 2010 Maxim Integrated Products. Maxim is a registered trademark of Maxim Integrated Products, Inc. ...

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