Data Sheet
1997 Apr 02 4
Philips Semiconductors Product speciļ¬cation
Remote 8-bit I/O expander for I
2
C-bus
PCF8574
4 BLOCK DIAGRAM
Fig.1 Block diagram (SOT38-1 and SOT162-1).
handbook, full pagewidth
MBD980
I C BUS
CONTROL
2
INPUT
FILTER
1
2
3
14
15
13
INTERRUPT
LOGIC
12
P7
11
P6
10
P5
9
P4
7
P3
6
P2
5
P1
4
P0
8 BIT
I/O
PORT
SHIFT
REGISTER
LP FILTER
WRITE pulse
READ pulse
POWER-ON
RESET
16
8
V
DD
V
SS
SDA
SCL
A2
A1
A0
INT
PCF8574