DS1921G Maxim, DS1921G Datasheet - Page 2

• Manufacturer Part Number: DS1921G
• Description: The DS1921G Thermochron® iButton® is a rugged, self-sufficient system that measures temperature and records the result in a protected memory section
• Manufacturer: Maxim

Thermochron iButton
ABSOLUTE MAXIMUM RATINGS
IO Voltage Range Relative to GND ..........................-0.5V to +6V
IO Sink Current....................................................................20mA
ELECTRICAL CHARACTERISTICS
(V
* Storage or operation above +50°C significantly reduces battery life.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
2
IO PIN: GENERAL DATA
1-Wire Pullup Resistance
Input Capacitance
Input Load Current
High-to-Low Switching Threshold
(Notes 4, 6, 7, 8)
Input Low Voltage
Low-to-High Switching Threshold
(Notes 4, 6, 7, 10)
Output Low Voltage at 4mA
Recovery Time (Notes 1, 4)
Time-Slot Duration (Notes 1, 12)
IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE
Reset Low Time (Notes 1,12)
Presence-Detect High
Time (Note 12)
Presence-Detect Low
Time (Note 12)
Presence-Detect
Sample Time (Notes 1, 4)
PUP
_______________________________________________________________________________________
= +2.8V to +5.25V, T
PARAMETER
A
= -40°C to +85°C.)
SYMBOL
R
t
t
t
t
t
t
V
SLOT
RSTL
C
V
V
REC
PDH
MSP
V
PDL
PUP
I
TH
OL
TL
IO
L
IL
(Notes 1, 2)
(Notes 3, 4)
IO pin at V
V
(Notes 1, 6, 9)
V
(Notes 6, 11)
Standard speed, R
Overdrive speed, R
Overdrive speed, directly prior to reset
pulse; R
Standard speed
Overdrive speed
Standard speed, V
Standard speed
Overdrive speed, V
Overdrive speed
Standard speed
Overdrive speed
Standard speed
Overdrive speed, V
Overdrive speed
Standard speed
Overdrive speed
PUP
PUP
> 4.5V
> 4.5V
PUP
PUP
= 2.2k
(Note 5)
CONDITIONS
PUP
PUP
PUP
PUP
Operating Temperature Range ..........................-40°C to +85°C*
Storage Temperature Range..............................-40°C to +50°C*
PUP
> 4.5V
= 2.2k
> 4.5V
> 4.5V
= 2.2k
1.14
0.71
1.00
0.66
MIN
480
540
1.1
7.5
7.5
65
48
58
15
60
60
5
2
5
8
6
TYP
100
MAX
2.70
2.70
0.30
2.70
2.70
800
640
640
270
2.2
0.4
8.6
10
80
80
60
24
32
75
6
UNITS
k
pF
μA
μs
μs
μs
μs
μs
μs
V
V
V
V