DS1921G Просмотр технического описания (PDF) - Maxim Integrated
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DS1921G Datasheet PDF : 42 Pages
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Thermochron iButton
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
(VPUP = +2.8V to +5.25V, TA = -40°C to +85°C.)
PARAMETER
IO PIN: GENERAL DATA
1-Wire Pullup Resistance
Input Capacitance
Input Load Current
High-to-Low Switching Threshold
(Notes 4, 6, 7, 8)
SYMBOL
RPUP
CIO
IL
VTL
CONDITIONS
(Notes 1, 2)
(Notes 3, 4)
IO pin at VPUP (Note 5)
VPUP > 4.5V
Input Low Voltage
Low-to-High Switching Threshold
(Notes 4, 6, 7, 10)
VIL
(Notes 1, 6, 9)
VTH
VPUP > 4.5V
Output Low Voltage at 4mA
Recovery Time (Notes 1, 4)
VOL
tREC
(Notes 6, 11)
Standard speed, RPUP = 2.2k
Overdrive speed, RPUP = 2.2k
Overdrive speed, directly prior to reset
pulse; RPUP = 2.2k
Time-Slot Duration (Notes 1, 12)
tSLOT
Standard speed
Overdrive speed
IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE
Reset Low Time (Notes 1,12)
tRSTL
Standard speed, VPUP > 4.5V
Standard speed
Overdrive speed, VPUP > 4.5V
Overdrive speed
Presence-Detect High
Time (Note 12)
tPDH
Standard speed
Overdrive speed
Presence-Detect Low
Time (Note 12)
Standard speed
tPDL
Overdrive speed, VPUP > 4.5V
Overdrive speed
Presence-Detect
Sample Time (Notes 1, 4)
tMSP
Standard speed
Overdrive speed
MIN TYP MAX UNITS
2.2
k
100 800
pF
10
µA
1.14
2.70
V
0.71
2.70
0.30
V
1.00
2.70
V
0.66
2.70
0.4
V
5
2
µs
5
65
µs
8
480
640
540
640
µs
48
80
58
80
15
60
µs
1.1
6
60
270
7.5
24
µs
7.5
32
60
75
µs
6
8.6
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