DS1205V Datasheet, PDF (1/1 Pages) Dallas Semiconductor – MultiKey

DS1205V
DS1205V
MultiKey
FEATURES
• Three secure read/write data partitions of 384 bits
each
• 64-bit security match and I.D. fields provide positive
identification and security for each secure data parti-
tion
• One non-secure read/write partition of 512 bits
• Electrical tampering is met with seemingly valid, yet
false, responses
• Secure data cannot be deciphered by reverse engi-
neering
• Access via Dallas 3-Wire Interface
• Applications include software authorization, configu-
ration management, and systems access control
PIN ASSIGNMENT
DALLAS
DS1205V
MULTIKEY
SIDE
1
5
BOTTOM: PIN VIEW
1.0 IN
See Mech. Drawings Section
DESCRIPTION
The DS1205V MultiKey has three, 384-bit read/write
data partitions, each protected by its own 64-bit I.D. and
security match fields. The security match field, pro-
grammed by the customer, can never be read from the
DS1205V. An additional security feature, the Intelligent
Response generator, uses invalid security match codes
as the “seed” to trigger seemingly valid, yet false
responses to electronic attack.
Communication with the DS1205V is via the Dallas
3-Wire Interface (Data, Clock, Reset). These signals
are under host software control.
The DS1205V MultiKey is designed to be plugged into a
standard 5-pin, 0.1 inch-center SIP receptacle. A guide
is provided to insure proper alignment with the recep-
tacle.
System designers can use the DS1205V to insure that
their valuable firmware can only by run when a valid key
is present. The MultiKey can also contain data on sys-
tem configurations and upgrade options. Designers
may choose to allow maintenance or diagnostic rou-
tines to be run only by an authorized key holder.
See the DS1205S MultiKey Chip data sheet for imple-
mentation details.
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