Datasheet

DS1921H/Z
40 of 45
PHYSICAL SPECIFICATION
Size
See mechanical drawing
Weight
3.3g
ABSOLUTE MAXIMUM RATINGS*
IO Voltage to GND
-0.5V, +6V
IO Sink Current
20mA
Temperature Range DS1921H, DS1921Z
-40°C to +85°C**
Storage Temperature Range
-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
Resistance
R
PUP
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
4mA
V
OL
0.4
V
5, 10
Recovery Time
t
REC
Standard Speed,
R
PUP
= 2.2kΩ
5
µs
1, 16
Overdrive Speed,
R
PUP
= 2.2kΩ
2
Overdrive Speed,
directly prior to reset
pulse; R
PUP
= 2.2kΩ
5
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,
V
PUP
> 4.5V
480
640
µs
1, 15
Standard Speed
540
640
Overdrive Speed
48
80