Data Sheet ADuCM320
Rev. C | Page 15 of 30
TIMING SPECIFICATIONS
I
2
C Timing
Table 3. I
2
C Timing in Standard Mode (100 kHz)
Slave
Parameter Description Min Typ Max Unit
t
L
SCL low pulse width 4.7 µs
t
H
SCL high pulse width 4.0 ns
t
SHD
Start condition hold time 4.0 µs
t
DSU
Data setup time 250 ns
t
DHD
Data hold time (SDA held internally for 300 ns after falling edge of SCL) 0 3.45 µs
t
RSU
Setup time for repeated start 4.7 µs
t
PSU
Stop condition setup time 4.0 µs
t
BUF
Bus-free time between a stop condition and a start condition 4.7 µs
t
R
Rise time for both SLC and SDA 1 µs
t
F
Fall time for both SLC and SDA 15 300 ns
t
VD;DAT
Data valid time 3.45 µs
t
VD;ACK
Data valid acknowledge time 3.45 µs
Table 4. I
2
C Timing in Fast Mode (400 kHz)
Slave
Parameter Description Min Typ Max Unit
t
L
SCL low pulse width 1.3 µs
t
H
SCL high pulse width 0.6 ns
t
SHD
Start condition hold time 0.3 µs
t
DSU
Data setup time 100 ns
t
DHD
Data hold time (SDA held internally for 300 ns after falling edge of SCL) 0 µs
t
RSU
Setup time for repeated start 0.6 µs
t
PSU
Stop condition setup time 0.3 µs
t
BUF
Bus-free time between a stop condition and a start condition 1.3 µs
t
R
Rise time for both SCL and SDA 20 300 ns
t
F
Fall time for both SCL and SDA 15 300 ns
VD;DAT
t
VD;ACK
Data valid acknowledge time 0.9 µs
Figure 2. I
2
C Compatible Interface Timing
12272-002
SDA (I/O)
MSB
LSB ACK MSB
1982–71
SCL (I)
P S
START
CONDITION
REPEATED
START
STOP
CONDITION
S(R)
t
DSU
t
H
t
L
t
SHD
t
PSU
t
DSU
t
BUF
t
DHD
t
VD; DAT
t
VD; ACK
t
R
t
F
t
F
t
R
t
DHD
t
RSU
