6.6 I
2
C Interface Timing Requirements (continued)
over recommended operating free-air temperature range (unless otherwise noted) (see 图 7-1)
MIN MAX UNIT
t
icr
I
2
C input rise time 1000 ns
t
icf
I
2
C input fall time 300 ns
t
ocf
I
2
C output fall time 10-pF to 400-pF bus 300 ns
t
buf
I
2
C bus free time between stop and start 4.7 µs
t
sts
I
2
C start or repeated start condition setup 4.7 µs
t
sth
I
2
C start or repeated start condition hold 4 µs
t
sps
I
2
C stop condition setup 4 µs
t
vd(data)
Valid data time SCL low to SDA output valid 3.45 µs
t
vd(ack)
Valid data time of ACK condition
ACK signal from SCL low to
SDA (out) low
3.45 µs
C
b
(1)
I
2
C bus capacitive load 400 pF
I
2
C BUS—FAST MODE
f
scl
I
2
C clock frequency 0 400 kHz
t
sch
I
2
C clock high time 0.6 µs
t
scl
I
2
C clock low time 1.3 µs
t
sp
I
2
C spike time 50 ns
t
sds
I
2
C serial-data setup time 100 ns
t
sdh
I
2
C serial-data hold time 0 ns
t
icr
I
2
C input rise time 20 300 ns
t
icf
I
2
C input fall time
20 × (V
CC
/
5.5 V)
300 ns
t
ocf
I
2
C output fall time 10-pF to 400-pF bus
20 × (V
CC
/
5.5 V)
300 ns
t
buf
I
2
C bus free time between stop and start 1.3 µs
t
sts
I
2
C start or repeated start condition setup 0.6 µs
t
sth
I
2
C start or repeated start condition hold 0.6 µs
t
sps
I
2
C stop condition setup 0.6 µs
t
vd(data)
Valid data time SCL low to SDA output valid 0.9 µs
t
vd(ack)
Valid data time of ACK condition
ACK signal from SCL low to
SDA (out) low
0.9 µs
C
b
(1)
I
2
C bus capacitive load 400 pF
(1) C
b
= total capacitance of one bus line in pF.
6.7 Switching Characteristics
over recommended operating free-air temperature range, C
L
≤ 100 pF (unless otherwise noted) (see 图 7-1 and 图 7-2)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
MIN MAX UNIT
t
iv
Interrupt valid time P port INT 4
μs
t
ir
Interrupt reset delay time SCL INT 4
μs
t
pv
Output data valid SCL P port 200 ns
t
ps
Input data setup time P port SCL 150 ns
t
ph
Input data hold time P port SCL 1
μs
PCA9555
ZHCSHU7J – AUGUST 2005 – REVISED MARCH 2021
www.ti.com.cn
8 Submit Document Feedback
Copyright © 2021 Texas Instruments Incorporated
Product Folder Links: PCA9555
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