PCF8574; PCF8574A
NXP Semiconductors
Remote 8-bit I/O expander for I2C-bus with interrupt
6. Pinning information
6.1 Pinning
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
A0
A1
A2
P0
P1
P2
P3
V
DD
1
2
20
19
18
INT
SCL
n.c.
P7
SDA
SCL
INT
P7
P6
3
n.c.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
A0
A1
A2
P0
P1
P2
P3
V
DD
4
17 P5
SDA
SDA
SCL
INT
P7
PCF8574P
PCF8574AP
5
16
15
14
13
12
11
V
P4
V
DD
PCF8574TS/3
PCF8574ATS/3
6
A0
A1
SS
PCF8574T/3
PCF8574AT/3
P6
7
P3
n.c.
P2
P1
8
n.c.
A2
P6
P5
9
P5
V
SS
P4
10
P0
V
SS
P4
002aad625
002aad626
002aad627
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
Pin description
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
quasi-bidirectional I/O 1
quasi-bidirectional I/O 2
quasi-bidirectional I/O 3
supply ground
P1
5
11
P2
6
12
P3
7
14
VSS
P4
8
15
9
16
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
P5
10
11
12
13
14
15
16
-
17
P6
19
P7
20
INT
SCL
SDA
VDD
n.c.
1
2
4
serial data line
5
supply voltage
3, 8, 13, 18
not connected
PCF8574_PCF8574A
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© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 5 — 27 May 2013
4 of 33
NXP [ NXP ]
