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DS1922E
iButton High-Temperature Logger with
8KB Data-Log Memory
ELECTRICAL CHARACTERISTICS (continued)
(V PUP = 3.0V to 5.25V, unless otherwise noted.)
PARAMETER
Presence-Detect Fall Time
(Note 13)
SYMBOL
t FPD
CONDITIONS
Standard speed, V PUP > 4.5V
Standard speed
MIN
1.5
1.5
TYP
MAX
5
8
UNITS
μs
Overdrive speed
Standard speed, V PUP > 4.5V
0.15
60
1
240
Presence-Detect Low Time
t PDL
Standard speed (Note 12)
Overdrive speed, V PUP > 4.5V (Note 12)
60
7
287
24
μs
Overdrive speed (Note 12)
7
28
Presence-Detect Sample Time
(Note 2)
t MSP
Standard speed, V PUP > 4.5V
Standard speed
65
71.5
75
75
μs
I/O PIN 1-Wire WRITE
Overdrive speed
Standard speed
8
60
9
120
Write-Zero Low Time
(Notes 2, 14)
t W0L
Overdrive speed, V PUP > 4.5V (Note 12)
6
12
μs
Overdrive speed (Note 12)
7.5
12
Write-One Low Time
(Notes 2, 14)
t W1L
Standard speed
Overdrive speed
5
1
15
1.95
μs
I/O PIN 1-Wire READ
Read Low Time
(Notes 2, 15)
Read Sample Time
(Notes 2, 15)
t RL
t MSR
Standard speed
Overdrive speed
Standard speed
Overdrive speed
5
1
t RL +
t RL +
15 -
1.95 -
15
1.95
μs
μs
REAL-TIME CLOCK (RTC)
Accuracy
See the RTC Accuracy
graph
Min/
Month
Frequency Deviation
F
0°C to +125°C
-600
+60
ppm
TEMPERATURE CONVERTER
Conversion Time
(Note 16)
Thermal Response Time
Constant (Note 17)
t CONV
RESP
8-bit mode
16-bit mode (11 bits)
Can package
30
240
130
75
600
ms
s
Conversion Error (Notes 18, 19)
Temperature Cycles
Operating Lifetime
N TCY
t LIFE
+15°C to +110°C (Note 20)
+110°C to +140°C
Cycle = ramp from +25°C to > +125°C
and back to +25°C (Note 21)
Temperature > +125°C (Note 21)
-1.5
±7
+1.5
300
300
°C
Cycles
Hours
Maxim Integrated
3
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