Datasheet

DS1808
13 of 17
AC ELECTRICAL CHARACTERISTICS (-40
o
C to +85
o
C, V
DD
=4.5V to 5.5V)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES
SCL Clock Frequency f
SCL
Fast Mode
Standard Mode
0
0
400
100
kHz 5
Bus Free Time Between
STOP and START
t
BUF
1.3
4.7
ms
5
Hold Time (repeated)
START Condition
t
HD:STA
0.6
4.0
ms
6, 5
Low Period of SCL
Clock
t
LOW
1.3
4.7
ms
5
High period of SCL
Clock
t
HIGH
0.6
4.0
ms
5
Data Hold Time t
HD:DAT
0
0
0.9
ms
5,7
Data Set-Up Time t
SU:DAT
100
250
ns 5
Start Set-Up Time t
SU:STA
0.6
4.7
ms
5
Rise Time of Both SDA
and SCL Signals
t
R
20+0.1
C
B
300
1000
ns 8
Fall Time of Both SDA
and SCL Signals
t
F
20+0.1
C
B
300
300
ns 8
Set-Up Time for STOP
Condition
t
SU:STO
0.6
4.0
ms
Capacitive Load for Each
Bus Line
C
B
400 pF 8