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8574A Datasheet PDF : 33 Pages
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NXP Semiconductors
6. Pinning information
6.1 Pinning
PCF8574; PCF8574A
Remote 8-bit I/O expander for I2C-bus with interrupt
A0 1
A1 2
16 VDD
15 SDA
A2 3
14 SCL
P0 4 PCF8574P 13 INT
P1 5 PCF8574AP 12 P7
P2 6
11 P6
P3 7
10 P5
VSS 8
9 P4
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A0 1
A1 2
A2 3
P0 4
P1 5
P2 6
P3 7
VSS 8
PCF8574T/3
PCF8574AT/3
16 VDD
15 SDA
14 SCL
13 INT
12 P7
11 P6
10 P5
9 P4
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INT 1
SCL 2
n.c. 3
SDA 4
VDD 5
A0 6
A1 7
n.c. 8
A2 9
P0 10
PCF8574TS/3
PCF8574ATS/3
20 P7
19 P6
18 n.c.
17 P5
16 P4
15 VSS
14 P3
13 n.c.
12 P2
11 P1
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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
VSS
P4
P5
P6
P7
INT
SCL
SDA
VDD
n.c.
Pin description
Pin
DIP16, SO16 SSOP20
1
6
2
7
3
9
4
10
5
11
6
12
7
14
8
15
9
16
10
17
11
19
12
20
13
1
14
2
15
4
16
5
-
3, 8, 13, 18
Description
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
PCF8574_PCF8574A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 27 May 2013
© NXP B.V. 2013. All rights reserved.
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