Not Recommended for New Design
DS1205V
MultiKey
DS1205V
021798 1/1
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
1.0 IN
BOTTOM: PIN VIEW
SIDE
DS1205V
MULTIKEY
DALLAS
15
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.