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Datasheet Quick-Ref
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PCF8574
8-Bit I/O Expander (I2C)
Datasheet (PDF)
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PCF8574
DIP-16
1
A0
2
A1
3
A2
4
P0
5
P1
6
P2
7
P3
8
VSS
16
VDD
15
SDA
14
SCL
13
~INT
12
P7
11
P6
10
P5
9
P4
vcc
gnd
in
out
io
Pin Reference
⌄
#
Label
Type
1
A0
in
2
A1
in
3
A2
in
4
P0
io
5
P1
io
6
P2
io
7
P3
io
8
VSS
gnd
9
P4
io
10
P5
io
11
P6
io
12
P7
io
13
~INT
out
14
SCL
in
15
SDA
io
16
VDD
vcc