TCA9554A Datasheet, PDF (15/33 Pages) Texas Instruments – LOW VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER

TCA9554A
www.ti.com
SCPS196 – DECEMBER 2010
I²C Interface Timing Requirements
over operating free-air temperature range (unless otherwise noted) (see Figure 10)
STANDARD MODE
I²C BUS
FAST MODE
I²C BUS
f_scl
I²C clock frequency
t_sch
I²C clock high time
t_scl
I²C clock low time
t_sp
I²C spike time
t_sds
I²C serial-data setup time
t_sdh
I²C serial-data hold time
t_icr
I²C input rise time
t_icf
I²C input fall time
t_ocf
I²C output fall time
10-pF to 400-pF bus
t_buf
I²C bus free time between Stop and Start
t_sts
I²C Start or repeated Start condition setup
t_sth
I²C Start or repeated Start condition hold
t_sps
I²C Stop condition setup
t_vd(data) Valid data time
SCL low to SDA output valid
t_vd(ack) Valid data time of ACK condition
ACK signal from SCL low to
SDA (out) low
C_b
I²C bus capacitive load
MIN
MAX
MIN
MAX
0
100
0
400
4
0.6
4.7
1.3
50
50
250
100
0
0
1000 20 + 0.1C_b ⁽¹⁾
300
300 20 + 0.1C_b ⁽¹⁾
300
300 20 + 0.1C_b ⁽¹⁾
300
4.7
1.3
4.7
0.6
4
0.6
4
0.6
300
50
0.3
3.45
0.1
0.9
400
400
UNIT
kHz
ms
ms
ns
ns
ns
ns
ns
ns
ms
ms
ms
ms
ns
ms
ns
(1) C_b = Total capacitive load of one bus in pF
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
200
100
1
FAST MODE
I²C BUS
MIN MAX
4
4
200
100
1
UNIT
ms
ms
ns
ns
ms
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