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DS1904
PHYSICAL SPECIFICATION
Size
Weight
Expected Service Life
ABSOLUTE MAXIMUM RATINGS
Voltage Range on 1-Wire to Ground
Operating Temperature Range
Storage Temperature Range
See mechanical drawing
3.3 grams
See Lifetime Graph
-0.5V to +7.0V
-40°C to +85°C *
-40°C to +85°C *
*
Storage or operation above +50°C significantly reduces battery life.
This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation
sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect
reliability.
DC ELECTRICAL CHARACTERISTICS
(T A = -40 ° C to +85 ° C)
PARAMETER
1-Wire Pullup Voltage
Logic 1
Logic 0
SYMBOL
V PUP
V IH
V IL
MIN
2.8
2.2
-0.3
TYP
MAX
6.0
6.0
0.8
UNITS
V
V
V
NOTES
1, 2
1
1, 3
Output Logic Low at 4 mA
Input Load Current
V OL
I L
5
0.4
V
μA
1
4
CAPACITANCE
(T A = +25 ° C)
PARAMETER
Capacitance 1-Wire
SYMBOL
C IN
MIN
TYP
MAX
50
UNITS
pF
NOTES
5
AC ELECTRICAL CHARACTERISTICS
(V PUP = 2.8V to 6.0V, T A = -40 ° C t o +85 ° C)
PARAMETER
Time Slot
Write 1 Low Time
Write 0 Low Time
Read Low Time
Read Data Valid
Release Time
Read Data Setup
SYMBOL
t SLOT
t LOW1
t LOW0
t LOWR
t RDV
t RELEASE
t SU
MIN
60
1
60
1
0
TYP
exactly 15
15
MAX
120
15
120
15
45
1
UNITS
μs
μs
μs
μs
μs
μs
μs
NOTES
6
7
Recovery Time
Reset High Time
t REC
t RSTH
1
480
μs
μs
Reset Low Time
Presence Detect High
Presence Detect Low
RTC Accuracy at +25°C
t RSTL
t PDH
t PDL
480
15
60
-2
960
60
240
+2
μs
μs
μs
min/mth
8
9
11 of 13
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