Datasheet

Thermochron iButton Device
DS1921G
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
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Revision History
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
Added bullet “Water resistant or waterproof if placed inside DS9107 iButton capsule (Exceeds Water
Resistant 3 ATM requirements)”
Deleted “application pending” from UL bullet and safety statement
120407
Added text to Detailed Description section: Note that the initial sealing level of DS1921G achieves
IP56. Aging and use conditions can degrade the integrity of the seal over time, so for applications
with significant exposure to liquids, sprays, or other similar environments, it is recommended to
place the Thermochron in the DS9107 iButton capsule. The DS9107 provides a watertight enclosure
that has been rated to IP68 (See www.maximintegrated.com/AN4126
)
1, 2
4/09 Created newer template-style data sheet All
4/10
Overdrive specifications for t
RSTL
, t
PDL
, and t
W0L
split into range V
PUP
> 4.5V and full range. New
values for the full range
2–4
4/11
Updated UL certificate reference; deleted  from the t
W1L
specification in the Electrical Characteristics
table; applied note 13 to the t
W0L
specification in the Electrical Characteristics table; added more
details to Electrical Characteristics table notes 7, 13, and 14
1, 3, 4
9/11
DS1921G-F5N# part number added to the Ordering Information; branding information updated in the
Pin Configuration
1, 41
3/12
Added terminology updates for consistency with similar products; added more details to the Parasite
Power section
1, 7, 8,
9, 14
6/13
Removed the UL 913 5th Ed. compliance statement from the Common iButton Device Features
section and iButton Can Physical Specification table; reworded the Electrical Characteristics table
Note 17
1, 4
11/13
Added the Busy state during Copy Scratchpad to the Command-Specific 1-Wire Communication
Protocol—Legend and 1-Wire Communication Examples sections
35