PCF8574; PCF8574A
NXP Semiconductors
Remote 8-bit I/O expander for I2C-bus with interrupt
START
condition
(S)
bit 7
MSB
(A7)
STOP
condition
(P)
bit 6
(A6)
bit 0
(R/W)
acknowledge
(A)
protocol
t
t
t
HIGH
SU;STA
LOW
1 / f
SCL
0.7 × V
0.3 × V
DD
SCL
SDA
DD
t
t
BUF
f
t
r
0.7 × V
0.3 × V
DD
DD
t
t
t
t
t
t
HD;DAT
VD;DAT
VD;ACK
SU;STO
HD;STA
SU;DAT
002aab175
Rise and fall times refer to VIL and VIH
.
Fig 17. I2C-bus timing diagram
PCF8574_PCF8574A
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Product data sheet
Rev. 5 — 27 May 2013
18 of 33
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