DS1991 Datasheet, PDF (1/14 Pages) Dallas Semiconductor – MultiKey iButton

www.dalsemi.com
SPECIAL FEATURES
§ 1,152-bit secure read/write, nonvolatile
memory
§ Secure memory cannot be deciphered
without matching 64-bit password
§ Memory is partitioned into 3 blocks of 384
bits each
§ 64-bit password and ID fields for each
memory block
§ 512-bit scratchpad ensures data transfer
integrity
§ Operating temperature range: -40°C to
+70°C
§ Over 10 years of data retention
COMMON iButton FEATURES
§ Unique, factory-lasered and tested 64-bit
registration number (8-bit family code + 48-
bit serial number + 8-bit CRC tester) assures
absolute traceability because no two parts are
alike
§ Multidrop controller for MicroLAN
§ Digital identification and information by
momentary contact
§ Chip-based data carrier compactly stores
information
§ Data can be accessed while affixed to object
§ Economically communicates to bus master
with a single digital signal at 16.3k bits per
second
§ Standard 16 mm diameter and 1-Wire
protocol ensure compatibility with iButton
family
§ Button shape is self-aligning with cup-
shaped probes
§ Durable stainless steel case engraved with
registration number withstands harsh
environments
DS1991
MultiKey iButton^TM
§ Easily affixed with self-stick adhesive
backing, latched by its flange, or locked with
a ring pressed onto its rim
§ Presence detector acknowledges when reader
first applies voltage
§ Meets UL#913 (4th Edit.); Intrinsically Safe
Apparatus, Approved under Entity Concept
for use in Class I, Division 1, Group A, B, C
and D Locations
F5 MICROCAN^TM
5.89
0.36
0.51
c 1993
16.25
YYWW REGISTERED RR
21
02
000000FBC52B
17.35
DATA
GROUND
All dimensions shown in millimeters
ORDERING INFORMATION
DS1991L-F5
F5 MicroCan
EXAMPLES OF ACCESSORIES
DS9096P
Self-Stick Adhesive Pad
DS9101
Multi-Purpose Clip
DS9093RA
Mounting Lock Ring
DS9093F
Snap-In Fob
DS9092
iButton Probe
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082099