TCA9554_15 Datasheet, PDF (7/38 Pages) Texas Instruments – TCA9554 Low Voltage 8-Bit I2C and SMBus Low-Power I/O Expander With Interrupt Output and Configuration Registers

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TCA9554
SCPS233D – MARCH 2012 – REVISED AUGUST 2015
6.6 I²C Interface Timing Requirements
over operating free-air temperature range (unless otherwise noted) (see Figure 10)
f_scl
t_sch
t_scl
t_sp
t_sds
t_sdh
t_icr
t_icf
t_ocf
t_buf
t_sts
t_sth
t_sps
t_vd(data)
t_vd(ack)
C_b
I²C clock frequency
I²C clock high time
I²C clock low time
I²C spike time
I²C serial-data setup time
I²C serial-data hold time
I²C input rise time
I²C input fall time
I²C output fall time
10-pF to 400-pF bus
I²C bus free time between Stop and Start
I²C Start or repeated Start condition setup
I²C Start or repeated Start condition hold
I²C Stop condition setup
Valid data time
SCL low to SDA output valid
Valid data time of ACK condition
ACK signal from SCL low to
SDA (out) low
I²C bus capacitive load
STANDARD MODE
I²C BUS
MIN
MAX
0
100
4
4.7
50
250
0
1000
300
300
4.7
4.7
4
4
3.45
3.45
400
FAST MODE
I²C BUS
MIN
0
0.6
1.3
100
0
20
20 × (V_DD / 5.5 V)
20 × (V_DD / 5.5 V)
1.3
0.6
0.6
0.6
MAX
400
50
300
300
300
0.9
UNIT
kHz
µs
µs
ns
ns
ns
ns
ns
ns
µs
µs
µs
µs
µs
0.9 µs
400 pF
6.7 Switching Characteristics
over operating free-air temperature range (unless otherwise noted) (see Figure 11 and Figure 12)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
STANDARD MODE
I²C BUS
MIN
MAX
t_iv Interrupt valid time
t_ir Interrupt reset delay time
t_pv Output data valid
t_ps Input data setup time
t_ph Input data hold time
P port
SCL
SCL
P port
P port
INT
INT
P7–P0
SCL
SCL
4
4
350
100
1
FAST MODE
I²C BUS
MIN MAX
4
4
350
100
1
UNIT
µs
µs
ns
ns
µs
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