NXP Semiconductors
PCF8574; PCF8574A
Remote 8-bit I/O expander for I
2
C-bus with interrupt
6. Pinning information
6.1 Pinning
A0
A1
A2
P0
1
2
3
4
16 V
DD
15 SDA
14 SCL
13 INT
A0
A1
A2
P0
1
2
3
4
5
6
7
8
002aad626
INT
SCL
16 V
DD
15 SDA
14 SCL
13 INT
12 P7
11 P6
10 P5
9
P4
1
2
3
4
5
6
7
8
9
20 P7
19 P6
18 n.c.
17 P5
16 P4
15 V
SS
14 P3
13 n.c.
12 P2
11 P1
002aad627
n.c.
SDA
V
DD
A0
A1
n.c.
A2
PCF8574P
PCF8574AP
12
P1 5
P7
P2
P3
V
SS
6
7
8
002aad625
11 P6
10 P5
9
P4
P1
P2
P3
V
SS
PCF8574T/3
PCF8574AT/3
PCF8574TS/3
PCF8574ATS/3
P0 10
Fig 3.
Pin configuration for DIP16
Fig 4.
Pin configuration for SO16
Fig 5.
Pin configuration for
SSOP20
6.2 Pin description
Table 3.
Symbol
A0
A1
A2
P0
P1
P2
P3
V
SS
P4
P5
P6
P7
INT
SCL
SDA
V
DD
n.c.
Pin description
Pin
DIP16, SO16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
-
SSOP20
6
7
9
10
11
12
14
15
16
17
19
20
1
2
4
5
3, 8, 13, 18
address input 0
address input 1
address input 2
quasi-bidirectional I/O 0
quasi-bidirectional I/O 1
quasi-bidirectional I/O 2
quasi-bidirectional I/O 3
supply ground
quasi-bidirectional I/O 4
quasi-bidirectional I/O 5
quasi-bidirectional I/O 6
quasi-bidirectional I/O 7
interrupt output (active LOW)
serial clock line
serial data line
supply voltage
not connected
Description
PCF8574_PCF8574A
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 5 — 27 May 2013
4 of 33
PHILIPS [ NXP SEMICONDUCTORS ]
