DS2705

Voltage Range on All Pins (Except VPP), Relative to VSS                                       -0.3V to +5.5V
Voltage Range on VPP Pin, Relative to VSS                                                           -0.3V to +18V
Continuous Source Current, MDQ 20mA
Operating Temperature Range                                                                              -40°C to +85°C
Storage Temperature Range                                                                                 -55°C to +125°C
Soldering Temperature                                                                          See IPC/JEDEC J-STD-020A Specification


Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device.

The DS2705 provides the master side of a Secure Hash Algorithm (SHA) based token authentication scheme. Hardware-based SHA authentication allows for security without the added cost and complexity of a microprocessor-based system. Batteries and other accessories are authenticated using a single contact through the Dallas 1-Wire® interface. Authentication is performed on demand or automatically, with the pass/fail status reported on open-drain output pins to signal the charge system and/or drive LEDs. The DS2705 stores a predetermined challenge-andresponse pair in nonvolatile (NV) EEPROM. The DS2705 works in conjunction with Dallas Battery Management SHA-1 token products, including the DS2703 and DS2704.