Datasheet

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
NXP Semiconductors
PCF8574; PCF8574A
Remote 8-bit I/O expander for I
2
C-bus with interrupt
6. Pinning information
6.1 Pinning
6.2 Pin description
Fig 3. Pin configuration for DIP16 Fig 4. Pin configuration for SO16 Fig 5. Pin configuration for
SSOP20
PCF8574P
PCF8574AP
A0 V
DD
A1 SDA
A2 SCL
P0 INT
P1 P7
P2 P6
P3 P5
V
SS
P4
002aad625
1
2
3
4
5
6
7
8
10
9
12
11
14
13
16
15
A0 V
DD
A1 SDA
A2 SCL
P0 INT
P1 P7
P2 P6
P3 P5
V
SS
P4
PCF8574T/3
PCF8574AT/3
002aad626
1
2
3
4
5
6
7
8
10
9
12
11
14
13
16
15
PCF8574TS/3
PCF8574ATS/3
P7
SCL P6
n.c. n.c.
SDA P5
P4
A0
A1 P3
n.c. n.c.
A2 P2
P0 P1
002aad627
1
2
3
4
5
6
7
8
9
10
12
11
14
13
16
15
18
17
20
19
V
DD
INT
V
SS
Table 3. Pin description
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, 8, 13, 18 not connected