DS1921 DALLAS [Dallas Semiconductor], DS1921 Datasheet - Page 40

• Manufacturer Part Number: DS1921
• Description: High-Resolution Thermochron iButton
• Manufacturer: DALLAS [Dallas Semiconductor]

PHYSICAL SPECIFICATION
Size
Weight
Safety
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 (V
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
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
V
V
t
V
C
SLOT
V
REC
I
PUP
TL
TH
OL
L
IO
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
PUP
PUP
PUP
PUP
CONDITIONS
= 2.2k
= 2.2k
> 4.5V
> 4.5V
PUP
PUP
= 2.2k
40 of 44
See mechanical drawing
3.3g
Meets UL#913 (4
Apparatus, approval under Entity Concept for use in
Class I, Division 1, Group A, B, C and D Locations
(application pending)
-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
65
5
2
5
8
th
TYP
100
Edit.); Intrinsically Safe
MAX UNITS NOTES
2.70
2.70
0.30
2.70
2.70
800
2.2
0.4
10
A
= -40°C to +85°C)
k
µA
pF
µs
µs
V
V
V
V
DS1921H/Z
5, 6, 7,
5, 6, 9,
1, 5, 8
3, 16
5, 10
1, 16
1, 15
1, 2
16
16
4