Datasheet

TCA7408
SCPS235B –NOVEMBER 2011–REVISED MARCH 2013 www.ti.com
I2C INTERFACE TIMING REQUIREMENTS (continued)
STANDARD MODE FAST MODE
UNIT
I
2
C BUS I
2
C BUS
PARAMETER
MIN MAX MIN MAX
t
sds
250 100 ns
I
2
C serial data setup time
t
sdh
0 0 ns
I
2
C serial data hold time
t
icr
1000 20 + 0.1C
b
300 ns
I
2
C input rise time
t
icf
300 20 + 0.1C
b
300 ns
I
2
C input fall time
t
ocf
300 20 + 0.1C
b
300 μs
I
2
C output fall time; 10 pF to 400 pF bus
t
buf
4.7 1.3 μs
I
2
C bus free time between Stop and Start
t
sts
4.7 0.6 μs
I
2
C Start or repeater Start condition setup time
t
sth
4 0.6 μs
I
2
C Start or repeater Start condition hold time
t
sps
4 0.6 μs
I
2
C Stop condition setup time
t
vd(data)
Valid data time; SCL low to SDA output valid 1 0.3 0.9 μs
Valid data time of ACK condition; ACK signal from SCL low to
t
vd(ack)
1 0.3 0.9 μs
SDA (out) low
RESET TIMING REQUIREMENTS
STANDARD MODE, FAST MODE,
I
2
C BUS
PARAMETER UNIT
MIN MAX
t
W
Reset pulse duration 250 ns
t
REC
Reset recovery time 250 ns
t
RESET
Time to reset 250 ns
SWITCHING CHARACTERISTICS
STANDARD MODE, FAST MODE,
FROM TO
I
2
C BUS
PARAMETER UNIT
(INPUT) (OUTPUT)
MIN MAX
t
iv
Interrupt valid time GPIO port INT 20 ns
t
ir
Interrupt reset delay time SCL INT 250 ns
t
pv
Output data valid SCL GPIO7–GPIO0 250 ns
t
ps
Input data setup time GPIO port SCL 0 ns
t
ph
Input data hold time GPIO port SCL 300 ns
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