DS1921H_11 Datasheet, PDF (40/45 Pages) Maxim Integrated Products – High-Resolution Thermochron iButton

PHYSICAL SPECIFICATION
Size
Weight
See mechanical drawing
3.3g
DS1921H/Z
ABSOLUTE MAXIMUM RATINGS*
IO Voltage to GND
IO Sink Current
Temperature Range DS1921H, DS1921Z
Storage Temperature Range
-0.5V, +6V
20mA
-40°C to +85°C**
-40°C to +50°C**
* 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.
** Storage or operation above 50°C significantly reduces battery life.
ELECTRICAL CHARACTERISTICS (V_PUP = 2.8V to 5.25V, T_A = -40°C to +85°C)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS NOTES
IO pin general data
1-Wire Pull-Up
R_PUP
Resistance
2.2 kΩ 1, 2
Input Capacitance
C_IO
100 800 pF 3, 16
Input Load Current
I_L
IO pin at V_PUP
10 µA
4
High-to-Low
V_TL V_PUP > 4.5V
1.14
2.70 V 5, 6, 7,
Switching Threshold
0.71
2.70
16
Input Low Voltage
V_IL
0.30 V 1, 5, 8
Low-to-High
V_TH V_PUP > 4.5V
1.00
2.70 V 5, 6, 9,
Switching Threshold
0.66
2.70
16
Output low voltage at V_OL
4mA
0.4
V
5, 10
Recovery Time
t_REC Standard Speed,
5
µs 1, 16
R_PUP = 2.2kΩ
Overdrive Speed,
2
R_PUP = 2.2kΩ
Overdrive Speed,
5
directly prior to reset
pulse; R_PUP = 2.2kΩ
Timeslot Duration
t_SLOT Standard Speed
65
µs 1, 15
Overdrive Speed
8
IO pin, 1-Wire Reset, Presence Detect Cycle
Reset Low Time
t_RSTL Standard Speed,
480
V_PUP > 4.5V
640 µs 1, 15
Standard Speed
540
640
Overdrive Speed
48
80
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