DS1990R
Serial Number 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.
10
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Revision History
REVISION
NUMBER
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
0 5/05 Initial release —
1 8/06 Reworded the UL#913 bullet to “Designed to meet...” 1
2 8/09
Updated the Ordering Information table to include RoHS-compliant packages; removed
the UL#913 bullet from the Common i
Button Features section
1
3 8/10
Created newer template-style data sheet; in the Electrical Characteristics table, deleted
the Output High Voltage parameter, moved the 1-Wire Pullup voltage parameter from
table header to table body, changed V
ILMAX
from 0.8V to 0.3V, added Note 14 to the t
W0L
specification, changed t
W1LMAX
from 15μs – to 15μs, and added more details to Notes
14 and 15; added the epsilon timing to the Write-Zero Time Slot in Figure 7
2, 3, 8
