PCA9539
REMOTE 16-BIT I2C AND SMBus LOW-POWER I/O EXPANDER
WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
www.ti.com
SCPS130D–AUGUST 2005–REVISED MARCH 2007
I2C Interface Timing Requirements
over recommended operating free-air temperature range (unless otherwise noted) (see Figure 11)
MIN
0
MAX
UNIT
kHz
µs
fscl
I2C clock frequency
I2C clock high time
I2C clock low time
I2C spike time
400
tsch
tscl
0.6
1.3
µs
tsp
50
ns
tsds
tsdh
ticr
I2C serial-data setup time
I2C serial-data hold time
I2C input rise time
I2C input fall time
100
ns
0
ns
(1)
20 + 0.1Cb
300
300
300
ns
(1)
(1)
ticf
20 + 0.1Cb
20 + 0.1Cb
ns
tocf
I2C output fall time
10-pF to 400-pF bus
ns
tbuf
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
1.3
0.6
0.6
0.6
50
µs
tsts
µs
tsth
µs
tsps
tvd(data)
tvd(ack)
Cb
µs
Valid-data time
SCL low to SDA output valid
ACK signal from SCL low to SDA (out) low
ns
Valid-data time of ACK condition
I2C bus capacitive load
0.1
0.9
µs
400
pF
(1) Cb = total capacitance of one bus line in pF
RESET Timing Requirements
over recommended operating free-air temperature range (unless otherwise noted) (see Figure 14)
MIN
6
MAX
UNIT
ns
tW
Reset pulse duration
Reset recovery time
Time to reset
tREC
tRESET
0
ns
400
ns
Switching Characteristics
over recommended operating free-air temperature range, CL ≤ 100 pF (unless otherwise noted) (see Figure 12 and
Figure 13)
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
Interrupt valid time
MIN
MAX
UNIT
tiv
P port
SCL
INT
INT
4
4
µs
µs
ns
ns
µs
tir
Interrupt reset delay time
Output data valid
tpv
tps
tph
SCL
P port
SCL
SCL
200
Input data setup time
Input data hold time
P port
P port
150
1
15
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