Datasheet
I
2
C INTERFACE TIMING REQUIREMENTS
RESET TIMING REQUIREMENTS
SWITCHING CHARACTERISTICS
PCA9538
www.ti.com
................................................................................................................................................ SCPS126E – SEPTEMBER 2006 – REVISED JUNE 2008
over operating free-air temperature range (unless otherwise noted) (see Figure 10 )
STANDARD MODE FAST MODE
I
2
C BUS I
2
C BUS
UNIT
MIN MAX MIN MAX
f
scl
I
2
C clock frequency 0 100 0 400 kHz
t
sch
I
2
C clock high time 4 0.6 µ s
t
scl
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2
C clock low time 4.7 1.3 µ s
t
sp
I
2
C spike time 50 50 ns
t
sds
I
2
C serial-data setup time 250 100 ns
t
sdh
I
2
C serial-data hold time 0 0 ns
t
icr
I
2
C input rise time 1000 20 + 0.1C
b
(1)
300 ns
t
icf
I
2
C input fall time 300 20 + 0.1C
b
(1)
300 ns
t
ocf
I
2
C output fall time 10-pF to 400-pF bus 300 20 + 0.1C
b
(1)
300 ns
t
buf
I
2
C bus free time between Stop and Start 4.7 1.3 µ s
t
sts
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2
C Start or repeated Start condition setup 4.7 0.6 µ s
t
sth
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2
C Start or repeated Start condition hold 4 0.6 µ s
t
sps
I
2
C Stop condition setup 4 0.6 µ s
t
vd(data)
Valid data time SCL low to SDA output valid 300 50 ns
ACK signal from SCL low to
t
vd(ack)
Valid data time of ACK condition 0.3 3.45 0.1 0.9 µ s
SDA (out) low
C
b
I
2
C bus capacitive load 400 400 ns
(1) C
b
= Total capacitance of one bus in pF
over operating free-air temperature range (unless otherwise noted)
STANDARD MODE FAST MODE
I
2
C BUS I
2
C BUS
PARAMETER UNIT
MIN MAX MIN MAX
t < Subscrip
t > w < /Subs Reset pulse duration 4 4 ns
cript >
t
REC
Reset recovery time 0 0 ns
t
RESET
Time to reset 400 400 ns
over operating free-air temperature range (unless otherwise noted) (see Figure 11 and Figure 12 )
STANDARD MODE FAST MODE
FROM TO
I
2
C BUS I
2
C BUS
PARAMETER UNIT
(INPUT) (OUTPUT)
MIN MAX MIN MAX
t
iv
Interrupt valid time P port INT 4 4 µ s
t
ir
Interrupt reset delay time SCL INT 4 4 µ s
t
pv
Output data valid SCL P7 – P0 200 200 ns
t
ps
Input data setup time P port SCL 100 100 ns
t
ph
Input data hold time P port SCL 1 1 µ s
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