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DS1205S Datasheet

  • DS1205S

  • MultiKey Chip

  • Dallas   Dallas

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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
鈥?/div>
Three
each
secure read/write data partitions of 384 bits
鈥?/div>
One non-secure read/write data partition of 512 bits
鈥?/div>
Secure data cannot be deciphered by reverse engi-
neering
鈥?/div>
Guaranteed
number
unique, 48-bit, laser etched serial
CLK
NC
GND
鈥?/div>
64-bit password and I.D. fields provide positive identi-
fication and security for each secure data partition
鈥?/div>
Maximum data transfer rate of 2 million bits/second
鈥?/div>
Low-power CMOS circuitry
鈥?/div>
Access via 3-wire or 1-wire interface
鈥?/div>
Applications include proprietary data, financial trans-
actions, secure personnel areas, and systems ac-
cess control
DS1205S 16-Pin SOIC (300 mil)
See Mech. Drawings
Section
PIN DESCRIPTION
V
CCI
RST
DQ
CLK
GND
BAT
DQOE
I/O
V
CCO
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
+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 in-
terface. The DS1205S MultiKey has three secure read/
write subkeys which are each 384 bits in length. In addi-
tion, there is a 512-bit read/write scratchpad which can
be used as a non-secure data area or as a holding regis-
ter 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), V
CC
power is supplied to the part on the V
CCI
pin, while the battery backup source is applied to the
BAT pin. In this mode of operation, the chip supply is
switched internally between V
CCI
and BAT (depending
on which is higher) and this level is presented internally
to the V
CCO
pin. In the Battery Operate Mode, the bat-
tery supply is connected directly to the V
CCO
pin while
the V
CCI
and BAT pins are grounded.
021798 1/17

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