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DS1921G
Thermochron iButton Device
ABSOLUTE MAXIMUM RATINGS
IO Voltage Range Relative to GND ..........................-0.5V to +6V
IO Sink Current....................................................................20mA
Operating Temperature Range ..........................-40°C to +85°C*
Storage Temperature Range..............................-40°C to +50°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 = +2.8V to +5.25V, T A = -40°C to +85°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
IO PIN: GENERAL DATA
1-Wire Pullup Resistance
R PUP
(Notes 1, 2)
2.2
k
Input Capacitance
Input Load Current
High-to-Low Switching Threshold
(Notes 4, 6, 7, 8)
Input Low Voltage
Low-to-High Switching Threshold
(Notes 4, 6, 7, 10)
Output Low Voltage at 4mA
C IO
I L
V TL
V IL
V TH
V OL
(Notes 3, 4)
IO pin at V PUP (Note 5)
V PUP > 4.5V
(Notes 1, 6, 9)
V PUP > 4.5V
(Notes 6, 11)
1.14
0.71
1.00
0.66
100
800
10
2.70
2.70
0.30
2.70
2.70
0.4
pF
μA
V
V
V
V
Standard speed, R PUP = 2.2k
5
Recovery Time (Notes 1, 4)
Time-Slot Duration (Notes 1, 12)
t REC
t SLOT
Overdrive speed, R PUP = 2.2k
Overdrive speed, directly prior to reset
pulse; R PUP = 2.2k
Standard speed
Overdrive speed
2
5
65
8
μs
μs
IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE
Standard speed, V PUP > 4.5V
480
640
Reset Low Time (Notes 1,12)
t RSTL
Standard speed
Overdrive speed, V PUP > 4.5V
540
48
640
80
μs
Overdrive speed
58
80
Presence-Detect High
Time (Note 12)
t PDH
Standard speed
Overdrive speed
15
1.1
60
6
μs
Standard speed
60
270
Presence-Detect Low
Time (Note 12)
t PDL
Overdrive speed, V PUP > 4.5V
7.5
24
μs
Overdrive speed
7.5
32
Presence-Detect
Sample Time (Notes 1, 4)
t MSP
Standard speed
Overdrive speed
60
6
75
8.6
μs
2
Maxim Integrated
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