DS1921H/Z Maxim Integrated Products, DS1921H/Z Datasheet - Page 38

• Manufacturer Part Number: DS1921H/Z
• Description: High Resolution Thermochron Ibutton Range H
• Manufacturer: Maxim Integrated Products

NOTES
Parameter
Name
t
t
t
t
t
t
10) The I-V characteristic is linear for voltages less than 1V.
11) e represents the time required for the pull-up circuitry to pull the voltage on IO up from V
12) d represents the time required for the pull-up circuitry to pull the voltage on IO up from V
13) This number was derived from a test conducted by Cemagref in Antony, France, in July of 2000.
14) The number of temperature conversions (= Samples) possible with the built-in energy source
15) Highlighted numbers are not in compliance with the published iButton standards. See comparison
16) These values are derived from simulation across process, voltage, and temperature and are not
SLOT
RSTL
PDH
PDL
W0L
SLS
1) System Requirement.
2) Maximum allowable pull-up resistance is a function of the number of 1-Wire devices in the
3) Capacitance on the data pin could be 800pF when power is first applied. If a 5kW resistor is used
4) Input load is to ground.
5) All voltages are referenced to ground.
6) V
7) Voltage below which, during a falling edge on IO, a logic 0 is detected.
8) The voltage on IO needs to be less or equal to V
9) Voltage above which, during a rising edge on IO, a logic 1 is detected.
, t
(incl. t
SPD
system and 1-Wire recovery times. The specified value here applies to systems with only one
device and with the minimum 1-Wire recovery times. For more heavily loaded systems, an active
pull-up such as that found in the DS2480 may be required.
to pull up the data line to V
5µs after power has been applied.
V
input high threshold of the bus master.
http://www.cemagref.fr/English/index.htm
depends on the operating and storage temperature of the device. When not in use for a mission,
the RTC oscillator should be turned off and device should be stored at a temperature not
exceeding +25°C. Under this condition the shelf life time is 10 years minimum.
table below.
production tested.
TL
TH
, V
.
REC
TH
are a function of the internal supply voltage.
)
61µs
480µs
15µs
60µs
60µs
15µs
Standard Speed
min
Standard Values
(undef.)
(undef.)
60µs
240µs
120µs
60µs
max
PUP;
the parasite capacitance will not affect normal communications
7µs
48µs
2µs
8µs
6µs
2µs
Overdrive Speed
min
38 of 40
Test Report No. E42
(undef.)
80µs
6µs
24µs
16µs
6µs
max
ILMAX
whenever the master drives the line low.
65µs
540µs
15µs
60µs
60µs
15µs
Standard Speed
min
DS1921H/Z Values
(undef.)
640µs
60µs
270µs
120µs
60µs
max
8µs
48µs
1.1µs
7.5µs
6µs
2µs
Overdrive Speed
min
(undef.)
80µs
6µs
24µs
15µs
6µs
IL
IL
max
to
to the