Datasheet

DS1904
11 of 13
PHYSICAL SPECIFICATION
Size See mechanical drawing
Weight 3.3 grams
Expected Service Life 10 years at 25°C
Safety Meets UL 913, 5th Ed., Rev. 1997-02-24;
Intrinsically Safe Apparatus, Approval under
Entity Concept for use in Class I, Division 1,
Group A, B, C, and D Locations
ABSOLUTE MAXIMUM RATINGS
Voltage Range on 1-Wire to Ground -0.5V to +7.0V
Operating Temperature Range -40°C to +70°C
Storage Temperature Range -40°C to +70°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.
DC ELECTRICAL CHARACTERISTICS
(T
A
= -40°C to +70°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, 5
Output Logic Low at 4 mA
V
OL
0.4
V
1
Input Load Current
I
L
5
µA
3
CAPACITANCE
(T
A
= +25°C)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Capacitance 1-Wire
C
IN
50
pF
8
AC ELECTRICAL CHARACTERISTICS
(V
PUP
= 2.8V to 6.0V, T
A
= -40°C to +70°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
7
Release Time
t
RELEASE
0
15
45
µs
Read Data Setup
t
SU
1
µs
4
Recovery Time
t
REC
1
µs
Reset High Time
t
RSTH
480
µs
Reset Low Time
t
RSTL
480
960
µs
6
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