PCA9554DW Datasheet, PDF (13/36 Pages) Texas Instruments – REMOTE 8-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS

Not Recommended for New Designs
PCA9554
www.ti.com ........................................................................................................................................................ SCPS128B – JULY 2006 – REVISED AUGUST 2008
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
300
0.3
3.45
400
(1) C_b = Total capacitive load of one bus in pF
FAST MODE
I²C BUS
MIN
MAX
0
400
0.6
1.3
50
100
0
20 + 0.1C_b(1)
300
20 + 0.1C_b(1)
300
20 + 0.1C_b(1)
300
1.3
0.6
0.6
0.6
50
UNIT
kHz
µs
µs
ns
ns
ns
ns
ns
ns
µs
µs
µs
µs
ns
0.1
0.9 µs
400 ns
SWITCHING CHARACTERISTICS
over operating free-air temperature range (unless otherwise noted) (see Figure 11 and Figure 12)
PARAMETER
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
FROM
(INPUT)
P port
SCL
SCL
P port
P port
TO
(OUTPUT)
INT
INT
P7–P0
SCL
SCL
STANDARD MODE
I²C BUS
MIN
MAX
4
4
200
100
1
FAST MODE
I²C BUS
MIN MAX
4
4
200
100
1
UNIT
µs
µs
ns
ns
µs
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