Owner's manual

DS1957
24 of 25
PHYSICAL SPECIFICATIONS
Size See mechanical drawing
Weight 3.3 grams
Humidity 90% RH at 50°C
Altitude 10,000 feet
Expected Service Life 5 years at 25°C
ABSOLUTE MAXIMUM RATINGS*
Voltage on DATA to Ground -0.5V to +6.0V
Operating Temperature -20°C to +70°C
Storage Temperature -20°C to +70°C
* This is a stress rating only and functional operation of the device at these or any other conditions
outside 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.
DC ELECTRICAL CHARACTERISTICS
(V
PUP
=4.0V to 5.5V; -20°C to +70°C)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Logic 1 V
IH
2.2 V 1
Logic 0 V
IL
-0.3 +0.6 V 1
Output Logic Low @4
mA
V
OL
0.4 V 1
Output Logic High V
OH
V
PUP
5.5 V 1, 2
Input Load Current Idle I
LI
100 µA 3
Input Load Current
Computing
I
LC
20 mA 3
CAPACITANCE (t
A
= 25°C)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
I/O (1-Wire) C
IN/OUT
150 nF 6
AC ELECTRICAL CHARACTERISTICS
REGULAR SPEED (V
PUP
=4.0V to 5.5V; -20°C to +70°C)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Time Slot t
SLOT
60 120 µs
Write 1 Low Time t
LOW1
115µs
Write 0 Low Time t
LOW0
60 120 µs
Read Low Time t
LOWR
115µs
Read Data Valid t
RDV
exactly 15 µs
Release Time t
RELEASE
01545µs
Read Data Setup t
SU
1µs5
Recovery Time t
REC
1µs
Reset Time High t
RSTH
480 µs 4
Reset Time Low t
RSTL
480 µs 7
Presence Detect High t
PDHIGH
15 60 µs
Presence Detect Low t
PDLOW
60 240 µs