DS1845

11 of 13

AC ELECTRICAL CHARACTERISTICS

(-40oC to 85oC, Vcc=2.7V to 5.5V)

PARAMETER

SYMBOL

CONDITION

MIN

TYP

MAX

UNITS

NOTES

SCL clock frequency

fSCL

0

0

400

100

kHz

*,6

**

Bus free time between

STOP and START

condition

tBUF

1.3

4.7

µs

*,6

**

Hold time (repeated)

START condition

tHD:STA

0.6

4.0

µs

*,7,6

**

Low period of SCL clock

tLOW

1.3

4.7

µs

*,6

**

High period of SCL clock

tHIGH

0.6

4.0

µs

*,6

**

Data hold time

tHD:DAT

0

0

0.9

µs

*,6,8

**

Data set-up time

tSU:DAT

100

250

ns

*,6

**

Start set-up time

tSU:STA

0.6

4.7

µs

*,6

**

Rise time of both SDA

and SCL signals

tR

20+0.1

CB

300

1000

ns

*,9

**

Fall time of both SDA

and SCL signals

tF

20+0.1

CB

300

300

ns

*,9

**

Set-up time for STOP

condition

tSU:STO

0.6

4.0

µs

*

**

Capacitive load for each

bus line

CB

400

pF

9

EEPROM write time

5ms

10

* fast mode

** standard mode

1. All voltages are referenced to ground.

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

address selections.

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