Datasheet

DS1977
2 of 29
PHYSICAL SPECIFICATION
Size
See mechanical drawing
Weight DS1977
Ca. 3.3g
ABSOLUTE MAXIMUM RATINGS
I/O Voltage to GND
-0.3V, +5.5V
I/O Sink Current
20mA
Junction Temperature
+150°C
Storage Temperature Range
-40°C to +85°C
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 the absolute maximum rating conditions for extended periods may affect device.
ELECTRICAL CHARACTERISTICS
(V
PUP
= 2.8V to 5.25V, T
A
= -40°C to +85°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I/O Pin General Data
1-Wire Pullup
Resistance
R
PUP
(Notes 1, 2) 0.6 2.2
kΩ
Input Capacitance
C
IO
(Note 3)
5
nF
Input Load Current
I
L
I/O pin at V
PUP
1
10
µA
High-to-Low Switching
Threshold
V
TL
(Notes 4, 5) 0.5 3.2 V
Input Low Voltage
V
IL
(Notes 1, 6)
0.30
V
Low-to-High Switching
Threshold
V
TH
(Notes 4, 7) 0.7 3.4 V
Switching Hysteresis
V
HY
(Note 8)
0.15
N/A
V
Output-Low Voltage at
4mA
V
OL
(Note 9) 0.4 V
Recovery Time t
REC
Standard speed, R
PUP
= 2.2kΩ
(Note 1)
5
µs
Overdrive speed, R
PUP
= 2.2kΩ
(Note 1)
2
Overdrive speed, directly prior
to reset pulse; R
PUP
= 2.2kΩ
(Note 1)
5
Rising-Edge Hold-off
Time
t
REH
Standard speed (Note 10)
0.5
5
µs
Overdrive speed (Note 10)
0.5
2
Timeslot Duration t
SLOT
Standard speed (Note 1)
65
µs
Overdrive speed (Note 1)
8
I/O Pin, 1-Wire Reset, Presence Detect Cycle
Reset Low Time t
RSTL
Standard speed (Note 1)
480
640
µs
Overdrive Speed (Note 1)
48
80
Presence Detect High
Time
t
PDH
Standard speed (Note 11)
15
60
µs
Overdrive speed (Note 11)
2.5
6.5
Presence Detect Fall
Time
t
FPD
Standard speed, V
PUP
> 4.5V
(Note 12)
1.5 5
µs
Standard speed (Note 12)
1.5
8
Overdrive speed (Note 12)
0.15
1
Presence Detect Low
Time
t
PDL
Standard speed
60
240
µs
Overdrive speed
8
24