PCF8574 Datasheet, PDF (4/24 Pages) NXP Semiconductors – Remote 8-bit I/O expander for I2C-bus

Philips Semiconductors
Remote 8-bit I/O expander for I²C-bus
4 BLOCK DIAGRAM
Product specification
PCF8574
handbook, full pagewidth
INT
13
1
A0
2
A1
3
A2
14
SCL
15
SDA
16
VDD
V _SS
8
INTERRUPT
LOGIC
PCF8574
LP FILTER
INPUT
FILTER
I²C BUS
CONTROL
SHIFT
REGISTER
8 BIT
4
P0
5
P1
6
P2
I/O
PORT
7
P3
9
P4
10
P5
11
P6
12
P7
POWER-ON
RESET
WRITE pulse
READ pulse
MBD980
Fig.1 Block diagram (SOT38-1 and SOT162-1).
1997 Apr 02
4