DS1921H Maxim, DS1921H Datasheet - Page 40

• Manufacturer Part Number: DS1921H
• Description: The DS1921H/Z Thermochron® iButtons® are rugged, self-sufficient systems that measure temperature and record the result in a protected memory section
• Manufacturer: Maxim

PHYSICAL SPECIFICATION
Size
Weight
ABSOLUTE MAXIMUM RATINGS*
* This is a stress rating only and functional operation of the device at these or any other conditions
** Storage or operation above 50°C significantly reduces battery life.
ELECTRICAL CHARACTERISTICS
IO Voltage to GND
IO Sink Current
Temperature Range DS1921H, DS1921Z
Storage Temperature Range
IO pin general data
1-Wire Pull-Up
Resistance
Input Capacitance
Input Load Current
High-to-Low
Switching Threshold
Input Low Voltage
Low-to-High
Switching Threshold
Output low voltage at
4mA
Recovery Time
Timeslot Duration
IO pin, 1-Wire Reset, Presence Detect Cycle
Reset Low Time
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.
PARAMETER
SYMBOL
t
R
t
V
V
V
t
C
V
SLOT
RSTL
REC
I
PUP
TH
OL
IO
L
TL
IL
IO pin at V
V
V
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
PUP
PUP
PUP
PUP
PUP
CONDITIONS
= 2.2kΩ
= 2.2kΩ
> 4.5V
> 4.5V
> 4.5V
PUP
PUP
= 2.2kΩ
40 of 45
(V
See mechanical drawing
3.3g
-0.5V, +6V
20mA
-40°C to +85°C**
-40°C to +50°C**
PUP
= 2.8V to 5.25V, T
MIN
1.14
0.71
1.00
0.66
480
540
65
48
5
2
5
8
TYP
100
MAX UNITS NOTES
2.70
2.70
0.30
2.70
2.70
800
640
640
2.2
0.4
10
80
A
= -40°C to +85°C)
kΩ
µA
pF
µs
µs
µs
V
V
V
V
5, 6, 7,
5, 6, 9,
1, 5, 8
3, 16
5, 10
1, 16
1, 15
1, 15
1, 2
16
16
4