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Figure 2. I²C Bus Timing
I
2
C BUS CHARACTERISTICS
Symbol Parameter
Test
Conditions
Min. Max. Unit
SCL
V
IL
Low Level Input Voltage - 0.3 + 1.5 V
V
IH
High Level Input Voltage 3.0 V
CC
+ 0.5 V
I
LI
Input Leakage Current V
I
= 0 to V
CC
- 10 + 10 µA
f
SCL
Clock Frequency 0 100 kHz
t
R
Input Rise Time 1.5V to 3V 1000 ns
t
F
Input Fall Time 3V to 1.5V 300 ns
C
I
Input Capacitance 10 pF
SDA
V
IL
Low Level Input Voltage - 0.3 + 1.5 V
V
IH
High Level Input Voltage 3.0 V
CC
+ 0.5 V
I
LI
Input Leakage Current V
I
= 0 to V
CC
- 10 + 10 µA
C
I
Input Capacitance 10 pF
t
R
Input Rise Time 1.5V to 3V 1000 ns
t
F
Input Fall Time 3V to 1.5V 300 ns
V
OL
Low Level Output Voltage I
OL
= 3mA 0.4 V
t
F
Output Fall Time 3V to 1.5V 250 ns
C
L
Load Capacitance 400 pF
TIMING
t
LOW
Clock Low Period 4.7 µs
t
HIGH
Clock High Period 4.0 µs
t
SU
, DAT Data Set-up Time 250 ns
t
HD
, DAT Data Hold Time 0 340 ns
t
SU
, STO Set-up Time from Clock High to Stop 4.0 µs
t
BUF
Start Set-up Time following a Stop 4.7 µs
t
HD
, STA Start Hold Time 4.0 µs
t
SU
, STA
Start Set-up Time following Clock Low-to High
Transition
4.7 µs
(start, stop)
t
BUF
t
LOW
t
HIGH
t
f
t
r
t
HD,STA t
HD,DAT
t
SU,DAT
t
SU,STA t
SU,STO
SDA
SCL
SDA
1
