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Two-Wire Serial Communication Interface
Over recommended operating supply and temperature ranges unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
f
SC
S2CLK Clock Frequency
400
kHz
SC:LOW
Clock Low Period
R
P
= 4.7K
Ω
, C
L
= 50pF
1.5
us
SC:HIGH
Clock High Period
R
P
= 4.7K
Ω
, C
L
= 50pF
0.6
us
SCD:TR
S2CLK and S2DAT Rise Time
R
P
= 4.7K
Ω
, C
L
= 50pF
0.3
us
SCD:TF
S2CLK and S2DAT Fall Time
R
P
= 4.7K
Ω
, C
L
= 50pF
0.3
us
SU:STA
Start Condition Setup Time
R
P
= 4.7K
Ω
, C
L
= 50pF
0.6
us
HD:STA
Start Condition Hold Time
R
P
= 4.7K
Ω
, C
L
= 50pF
0.6
us
HD:STO
Stop Condition Hold Time
R
P
= 4.7K
Ω
, C
L
= 50pF
0.6
us
SC:SD
Clock Falling Edge to Data
R
P
= 4.7K
Ω
, C
L
= 50pF
0
us
SD:SC
Data to Clock Rising Edge
R
P
= 4.7K
Ω
, C
L
= 50pF
0.1
us
SCL:SD
S2CLK Low to S2DAT Data
Valid
R
P
= 4.7K
Ω
, C
L
= 50pF
0.1
0.9
us
BUF
Bus Free Time
R
P
= 4.7K
Ω
, C
L
= 50pF
13
us
AC Timing Diagrams
20147122
FIGURE 1. Two-Wire Serial Communication Interface Timing Diagram
DS90C3202
www.national.com
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