DS1844 datasheet(8/14 Pages) DALLAS

8 / 14 page

DS1844

8 of 14

101999

ANALOG RESISTOR CHARACTERISTICS

(-40°C to +85°C; VCC=2.7V to 5.5V)

PARAMETER

SYMBOL

CONDITION

MIN

TYP

MAX

UNITS

NOTES

End-to-End Resistor

Tolerance

-20

+20

Absolute Linearity

-0.5

+0.5

LSB

Relative Linearity

-0.25

+0.25

LSB

-3dB Cutoff frequency

fcutoff

kHz

Temperature Coefficent

750

ppm/°C

2-WIRE ADDRESSABLE INTERFACE

AC ELECTRICAL CHARACTERISTICS

(-40°C to +85°C; VCC=2.7V to 5.5V)

PARAMETER

SYMBOL

CONDITION

MIN

TYP

MAX

UNITS

NOTES

Port Select Setup

tSETUP

20,22

SCL Clock Frequency

fSCL

400

100

kHz

*,8

**,22

Bus Free Time Between

STOP and START Condition

tBUF

1.3

4.7

µs

*,8

**,22

Hold Time (repeated)

START Condition

tHD:STA

0.6

4.0

µs

*,5,8

**,22

Low Period of SCL Clock

tLOW

1.3

4.7

µs

*,8

**,22

High Period of SCL Clock

tHIGH

0.6

4.0

µs

*,8

**,22

Data Hold Time

tHD:DAT

0.9

µs

*,6,7,

**,22

Data Setup Time

tSU:DAT

100

250

*,8

**,22

Rise Time of Both SDA and

SCL Signals

20+0.1CB

300

1000

*,9

**,22

Fall Time of Both SDA and

SCL Signals

20+0.1CB

300

*,9

**,22

Setup Time for STOP

Condition

tSU:STO

0.6

4.0

µs

**,22

Capacitive Load for each

Bus Line

400

* fast mode

** standard mode

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