Datasheet

DS1972
1024-Bit EEPROM i
Button
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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© 2012 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
Revision History
REVISION
NUMBER
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
0 4/06 Initial release —
1 8/06
UL#913 bullet changed from “Meets UL#93 (4
th
Edit.). . .(Application Pending)” to
“Designed to meet UL#93 (4
th
Edit.). . .”
1, 2
Deleted UL#913 bullet from the Common iButton Features section. 1
2 8/09
Changed the RoHS packages to lead(Pb)-free packages in the Ordering Information
table.
1
Changed V
TLMIN
from 0.46V to 0.5V in the Electrical Characteristics table. 2
In the Absolute Maximum Ratings, changed storage temp to -55°C to +125°C; in the
Electrical Characteristics table, changed V
TH
, V
TL
based on V
PUP
and data retention to
40 years min at 85°C; added note to retention spec: “EEPROM writes can become
nonfunctional after the data-retention time is exceeded. Long-term storage at elevated
temperatures is not recommended; the device can lose its write capability after 10
years at +125°C or 40 years at +85°C.”
2, 3
In the Electrical Characteristics table, changed the V
ILMAX
spec from 0.3V to 0.5V;
removed  from the t
W1LMAX
spec; added Note 17 to t
W0L
spec; updated EC table
Notes 17 and 18; corrected Note 20.
2, 3
Added  to Figure 11 Write-Zero Time Slot. 18
Added Package Information table. 22
3 4/10
Created newer template-style data sheet. All
4 1/12
Updated Note 1 in the Electrical Characteristics section; specified the data memory
default status and added a note that the memory must be programmed to FFh for the
EPROM mode to function to the Memory Access section.
3, 7, 8