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DS1205S

Dallas Semiconducotr
Part Number DS1205S
Manufacturer Dallas Semiconducotr
Description MultiKey Chip
Published Dec 6, 2005
Detailed Description DS1205S DS1205S MultiKey Chip FEATURES PIN ASSIGNMENT VCCI NC RST DQ NC 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCCO N...
Datasheet PDF File DS1205S PDF File

DS1205S
DS1205S

Overview
DS1205S DS1205S MultiKey Chip FEATURES PIN ASSIGNMENT VCCI NC RST DQ NC 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCCO NC I/O GND NC DQOE NC BAT • Three each secure read/write data partitions of 384 bits • One non-secure read/write data partition of 512 bits • Secure data cannot be deciphered by reverse engineering • Guaranteed number unique, 48-bit, laser etched serial CLK NC GND • 64-bit password and I.
D.
fields provide positive identification and security for each secure data partition • Maximum data transfer rate of 2 million bits/second • Low-power CMOS circuitry • Access via 3-wire or 1-wire interface • Applications include proprietary data, financial transactions, secure personnel areas, and systems access control DS1205S 16-Pin SOIC (300 mil) See Mech.
Drawings Section PIN DESCRIPTION VCCI RST DQ CLK GND BAT DQOE I/O VCCO – – – – – – – – – +5V Supply (Battery Backup Mode) Reset (3-Wire) Data (3-Wire) Clock (3-Wire) Ground Battery (+) (Battery Backup Mode) Data Available (3-Wire) Data I/O (1-Wire) Battery (+) (Battery Powered Mode) DESCRIPTION The DS1205S MultiKey Chip is an enhanced version of the DS1204U Electronic Key which has both a standard 3-wire interface (data, clock, and reset) and a 1-wire interface.
The DS1205S MultiKey has three secure read/ write subkeys which are each 384 bits in length.
In addition, there is a 512-bit read/write scratchpad which can be used as a non-secure data area or as a holding register for data transfer to one of the three subkeys.
Each subkey within the part is uniquely addressable on byte boundaries.
OPERATING MODES There are two modes of operation for powering the DS1205S MultiKey Chip.
In the Normal Mode (Battery Backup), VCC power is supplied to the part on the VCCI pin, while the battery backup source is applied to the BAT pin.
In this mode of operation, the chip supply is switched internally between VCCI and BAT (depending on which is higher) and this level is presented internally to the VCCO pin.
In th...


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