DS1904 Maxim, DS1904 Datasheet - Page 11

• Manufacturer Part Number: DS1904
• Description: The DS1904 RTC iButton® is a rugged real-time clock module that can be accessed with minimal hardware
• Manufacturer: Maxim

PHYSICAL SPECIFICATION
Size
Weight
Expected Service Life
Safety
ABSOLUTE MAXIMUM RATINGS
Voltage Range on 1-Wire to Ground
Operating Temperature Range
Storage Temperature Range
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
CAPACITANCE
(T
AC ELECTRICAL CHARACTERISTICS
(V
PARAMETER
1-Wire Pullup Voltage
Logic 1
Logic 0
Output Logic Low at 4 mA
Input Load Current
PARAMETER
Capacitance 1-Wire
PARAMETER
Time Slot
Write 1 Low Time
Write 0 Low Time
Read Low Time
Read Data Valid
Release Time
Read Data Setup
Recovery Time
Reset High Time
Reset Low Time
Presence Detect High
Presence Detect Low
RTC Accuracy at +25°C
A
A
PUP
= -40°C to +70°C)
= +25°C)
= 2.8V to 6.0V, T
A
= -40°C to +70°C)
SYMBOL
SYMBOL
SYMBOL
t
RELEASE
t
t
t
V
t
t
t
V
LOWR
t
t
t
t
V
C
LOW1
LOW0
V
SLOT
RSTH
RSTL
RDV
t
REC
PDH
PDL
I
PUP
SU
OL
L
IN
IH
IL
11 of 13
MIN
MIN
MIN
-0.3
480
480
2.8
2.2
60
60
15
60
-2
1
1
0
1
See mechanical drawing
3.3 grams
10 years at 25°C
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
-0.5V to +7.0V
-40°C to +70°C
-40°C to +70°C
exactly 15
TYP
TYP
TYP
15
5
MAX
MAX
MAX
120
120
960
240
+2
6.0
6.0
0.8
0.4
15
15
45
60
50
1
min/mth
UNITS
UNITS
UNITS
µA
pF
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
V
V
V
V
NOTES
NOTES
NOTES
DS1904
1, 2
1, 5
1
1
3
8
7
4
6
9