DS1844
ANALOG RESISTOR CHARACTERISTICS
(-40°C to +85°C; V
CC
=2.7V to 5.5V)
PARAMETER
End-to-End Resistor
Tolerance
Absolute Linearity
Relative Linearity
-3dB Cutoff frequency
Temperature Coefficent
f
cutoff
750
SYMBOL
CONDITION
MIN
-20
-0.5
-0.25
TYP
MAX
+20
+0.5
+0.25
UNITS
%
LSB
LSB
kHz
ppm/°C
NOTES
25
16
17
13
18
2-WIRE ADDRESSABLE INTERFACE
AC ELECTRICAL CHARACTERISTICS
PARAMETER
Port Select Setup
SCL Clock Frequency
Bus Free Time Between
STOP and START Condition
Hold Time (repeated)
START Condition
Low Period of SCL Clock
High Period of SCL Clock
Data Hold Time
Data Setup Time
Rise Time of Both SDA and
SCL Signals
Fall Time of Both SDA and
SCL Signals
Setup Time for STOP
Condition
Capacitive Load for each
Bus Line
(-40°C to +85°C; V
CC
=2.7V to 5.5V)
MIN
30
0
0
1.3
4.7
0.6
4.0
1.3
4.7
0.6
4.0
0
0
100
250
20+0.1C
B
20+0.1C
B
SYMBOL
t
SETUP
f
SCL
t
BUF
t
HD:STA
t
LOW
t
HIGH
t
HD:DAT
t
SU:DAT
t
R
t
F
t
SU:STO
C
B
CONDITION
TYP
MAX
400
100
UNITS
ns
kHz
µs
µs
µs
µs
NOTES
20,22
*,8
**,22
*,8
**,22
*,5,8
**,22
*,8
**,22
*,8
**,22
*,6,7,
**,22
*,8
**,22
*,9
**,22
*,9
**,22
*,
**,22
9
0.9
µs
ns
300
1000
300
300
ns
ns
µs
0.6
4.0
400
pF
* fast mode
** standard mode
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101999
DALLAS [ DALLAS SEMICONDUCTOR ]
