Data Sheet

1997 Apr 02 5
Philips Semiconductors Product specification
Remote 8-bit I/O expander for I
2
C-bus
PCF8574
5 PINNING
SYMBOL
PIN
DESCRIPTION
DIP16; SO16 SSOP20
A0 1 6 address input 0
A1 2 7 address input 1
A2 3 9 address input 2
P0 4 10 quasi-bidirectional I/O 0
P1 5 11 quasi-bidirectional I/O 1
P2 6 12 quasi-bidirectional I/O 2
P3 7 14 quasi-bidirectional I/O 3
V
SS
8 15 supply ground
P4 9 16 quasi-bidirectional I/O 4
P5 10 17 quasi-bidirectional I/O 5
P6 11 19 quasi-bidirectional I/O 6
P7 12 20 quasi-bidirectional I/O 7
INT 13 1 interrupt output (active LOW)
SCL 14 2 serial clock line
SDA 15 4 serial data line
V
DD
16 5 supply voltage
n.c. − 3 not connected
n.c. − 8 not connected
n.c. − 13 not connected
n.c. − 18 not connected
handbook, halfpage
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
INT
A0
A1
A2
P0
P1
P2
P3
SDA
V
SS
SCL
P7
P6
P5
P4
V
DD
PCF8574
PCF8574A
MBD979
Fig.2 Pin configuration (DIP16; SO16).
handbook, halfpage
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
INT
SCL
n.c.
SDA
V
DD
A0
A1
n.c.
A2
P0
P7
P6
n.c.
P5
V
SS
P4
P3
n.c.
P2
P1
PCF8574TS
MBD978
Fig.3 Pin configuration (SSOP20).