Rainbow-electronics DS1845 Manuel d'utilisateur télécharger pdf (Page 11)

DS1845

11 of 13

AC ELECTRICAL CHARACTERISTICS (-40

C to 85

C, Vcc=2.7V to 5.5V)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES

SCL clock frequency f

SCL

400

100

kHz *,6

Bus free time between

STOP and START

condition

BUF

1.3

4.7

µs

*,6

Hold time (repeated)

START condition

HD:STA

0.6

4.0

µs

*,7,6

Low period of SCL clock t

LOW

1.3

4.7

µs

*,6

High period of SCL clock t

HIGH

0.6

4.0

µs

*,6

Data hold time t

HD:DAT

0.9

µs

*,6,8

Data set-up time t

SU:DAT

100

250

ns *,6

Start set-up time t

SU:STA

0.6

4.7

µs

*,6

Rise time of both SDA

and SCL signals

20+0.1

300

1000

ns *,9

Fall time of both SDA

and SCL signals

20+0.1

300

ns *,9

Set-up time for STOP

condition

SU:STO

0.6

4.0

µs

Capacitive load for each

bus line

400 pF 9

EEPROM write time T

5ms10

* fast mode

** standard mode

NOTES:

1. All voltages are referenced to ground.

2. I

STBY

specified with for V

equal 3.0V and 5.0V and control port logic pins are driven to the

appropriate logic levels. Appropriate logic levels specify that logic inputs are within a 0.5V of

ground or V

for the corresponding inactive state.

3. I/O pins of fast mode devices must not obstruct the SDA and SCL lines if V

is switched off.

4. Address Inputs, A0, A1, and A2, should be tied to either V

or GND depending on the desired

address selections.

5. I

STBY

specified with for V

equal 3.0V and 5.0V and control port logic pins are driven to the

appropriate logic levels. Appropriate logic levels specify that logic inputs are within a 0.5V of

ground or V

for the corresponding inactive state.

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Rainbow-electronics DS1845 Manuel d'utilisateur Page 11

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