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DS1922L/DS1922T
iButton Temperature Loggers
with 8KB Data-Log Memory
ABSOLUTE MAXIMUM RATINGS
IO Voltage Range to GND ........................................-0.3V to +6V
IO Sink Current....................................................................20mA
Operating Temperature Range
DS1922L ...........................................................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range*
DS1922L..........................................................-40°C to +85°C*
DS1922T ...........................................................0°C to +125°C*
DS1922T ............................................................0°C to +125°C
*Storage or operation above +50°C significantly reduces battery life.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V PUP = +3.0V to +5.25V.)
PARAMETER
Operating Temperature
SYMBOL
T A
CONDITIONS
DS1922L (Note 1)
DS1922T (Note 1)
MIN
-40
0
TYP
MAX
+85
+125
UNITS
°C
IO PIN: GENERAL DATA
1-Wire Pullup Resistance
R PUP
(Notes 2, 3)
2.2
k
Input Capacitance
Input Load Current
High-to-Low Switching Threshold
Input Low Voltage
Low-to-High Switching Threshold
Switching Hysteresis
Output Low Voltage
C IO
I L
V TL
V IL
V TH
V HY
V OL
(Note 4)
IO pin at V PUP
(Notes 5, 6)
(Notes 2, 7)
(Notes 5, 8)
(Note 9)
At 4mA (Note 10)
0.4
0.7
0.09
100
6
800
10
3.2
0.3
3.4
N/A
0.4
pF
μA
V
V
V
V
V
Standard speed, R PUP = 2.2k
5
Recovery Time (Note 2)
t REC
Overdrive speed, R PUP = 2.2k
Overdrive speed, directly prior to reset
pulse; R PUP = 2.2k
2
5
μs
Rising-Edge Hold-Off Time
t REH
(Note 11)
0.6
2.0
μs
Standard speed
65
Time-Slot Duration (Note 2)
t SLOT
Overdrive speed, V PUP > 4.5V
8
μs
Overdrive speed (Note 12)
IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE
9.5
Standard speed, V PUP > 4.5V
480
720
Reset Low Time (Note 2)
t RSTL
Standard speed (Note 12)
Overdrive speed, V PUP > 4.5V
690
48
720
80
μs
Overdrive speed (Note 12)
Standard speed, V PUP > 4.5V
70
15
80
60
Presence-Detect High Time
t PDH
Standard speed (Note 12)
15
63.5
μs
Overdrive speed (Note 12)
2
7
Presence-Detect Fall Time
(Note 13)
t FPD
Standard speed, V PUP > 4.5V
Standard speed
1.5
1.5
5
8
μs
2
Overdrive speed
0.15
1
Maxim Integrated
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