Datasheet

DS1904
11 of 13
PHYSICAL SPECIFICATION
Size S
ee mechanical drawing
Weight 3.3 grams
Expected Service Life See Lifetime Graph
ABSOLUTE MAXIMUM RATINGS
Voltage Range on 1-Wire to Ground -0.5V to +7.0V
Operating Temperature Range -40°C to +85°C
*
S
torage Temperature Range -40°C to +85°C
*
*
Storage or operation above +50°C significantly reduces battery life.
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.
DC ELECTRICAL CHARACTERISTICS
(T
A
= -40°C to +85°C)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
1-Wire Pullup Voltage V
PUP
2.8 6.0 V 1, 2
Logic 1 V
IH
2.2 6.0 V 1
Logic 0 V
IL
-0.3 0.8 V 1, 3
Output Logic Low at 4 mA V
OL
0.4 V 1
Input Load Current I
L
5 µA 4
CAPACITANCE
(T
A
= +25°C)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Capacitance 1-Wire C
IN
50 pF 5
AC ELECTRICAL CHARACTERISTICS
(V
PUP
= 2.8V to 6.0V, T
A
= -40°C to +85°C)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Time Slot t
SLOT
60 120 µs
Write 1 Low Time t
LOW1
1 15 µs
Write 0 Low Time t
LOW0
60 120 µs
Read Low Time t
LOWR
1 15 µs
Read Data Valid t
RDV
exactly 15 µs 6
Release Time t
RELEASE
0 15 45 µs
Read Data Setup t
SU
1 µs 7
Recovery Time t
REC
1 µs
Reset High Time t
RSTH
480 µs
Reset Low Time t
RSTL
480 960 µs 8
Presence Detect High t
PDH
15 60 µs
Presence Detect Low t
PDL
60 240 µs
RTC Accuracy at +25°C -2 +2 min/mth 9